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JTextArea gives out weird text when adding something to it [duplicate]

This question already exists:
JTextarea gives out weird text [closed]
Closed 29 days ago.
Hey I’m working on a Selling class of a simple Java Swing GUI supermarket project. When I add the first item to the billingtxt, it lists them normally as if there is nothing wrong! But if I add more items, it will bring out weird text as shown in the image.
First item works just fine but second will bring weird text
This is the text Im talking about:
My code is shared underneath. Any help would be greatly appreciated! Thanks in advance:)
package supermarket1;
import java.awt.Color;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
import net.proteanit.sql.DbUtils;
/**
*
* #author patrickschnepf
*/
public class Selling1 extends javax.swing.JFrame {
/**
* Creates new form Selling1
*/
public Selling1() {
initComponents();
SelectSeller();
}
Connection Con = null;
Statement St = null;
ResultSet Rs = null;
public void SelectSeller()
{
try {
Con = DriverManager.getConnection("jdbc:derby://localhost:1527/SuperMarketdb1","User1","1234");
St = Con.createStatement();
Rs = St.executeQuery("Select * from User1.PRODUCTTBL");
ProductTable.setModel(DbUtils.resultSetToTableModel(Rs));
} catch (Exception e) {
e.printStackTrace();
}
}
int PrId, newQty;
public void update()
{
newQty = AvailQty - Integer.valueOf(ProdQty.getText());
try{
Con = DriverManager.getConnection("jdbc:derby://localhost:1527/SuperMarketdb1","User1","1234");
String Query ="Update User1.PRODUCTTBL set PRODQUANTITY="+newQty+""+" where PRODID="+PrId;
Statement Add = Con.createStatement();
Add.executeUpdate(Query);
SelectSeller();
}catch(SQLException e){
e.printStackTrace();
}
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel8 = new javax.swing.JLabel();
jPanel2 = new javax.swing.JPanel();
jScrollPane1 = new javax.swing.JScrollPane();
ProductTable = new javax.swing.JTable();
jLabel9 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
BillTxt = new javax.swing.JTextArea();
AddBtn = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
ProdName = new javax.swing.JTextField();
jLabel5 = new javax.swing.JLabel();
ProdQty = new javax.swing.JTextField();
ClearBtn = new javax.swing.JButton();
EditBtn = new javax.swing.JButton();
SummeLbl = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBackground(new java.awt.Color(0, 153, 0));
jLabel8.setFont(new java.awt.Font("Arial Black", 1, 20)); // NOI18N
jLabel8.setForeground(new java.awt.Color(255, 255, 255));
jLabel8.setText("X");
jLabel8.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jLabel8MouseClicked(evt);
}
public void mouseEntered(java.awt.event.MouseEvent evt) {
jLabel8MouseEntered(evt);
}
});
jPanel2.setBackground(new java.awt.Color(255, 255, 255));
ProductTable.setAutoCreateRowSorter(true);
ProductTable.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
ProductTable.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
},
new String [] {
"ProdID", "Name", "Menge", "Preis", "Kategorie"
}
));
ProductTable.setRowHeight(25);
ProductTable.setSelectionBackground(new java.awt.Color(255, 102, 0));
ProductTable.setSelectionForeground(new java.awt.Color(255, 255, 255));
ProductTable.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
ProductTableMouseClicked(evt);
}
});
jScrollPane1.setViewportView(ProductTable);
jLabel9.setFont(new java.awt.Font("Arial Black", 1, 14)); // NOI18N
jLabel9.setForeground(new java.awt.Color(255, 102, 0));
jLabel9.setText("Wählen sie die zu Verkaufende Produkte aus:");
jLabel3.setFont(new java.awt.Font("Arial Black", 1, 20)); // NOI18N
jLabel3.setForeground(new java.awt.Color(255, 102, 0));
jLabel3.setText("Produkt Liste");
BillTxt.setColumns(20);
BillTxt.setFont(new java.awt.Font("Arial Black", 0, 14)); // NOI18N
BillTxt.setRows(5);
jScrollPane2.setViewportView(BillTxt);
AddBtn.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
AddBtn.setForeground(new java.awt.Color(255, 102, 0));
AddBtn.setText("Zur Rechnung hinzufügen");
AddBtn.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
AddBtnMouseClicked(evt);
}
});
jLabel4.setFont(new java.awt.Font("Arial Black", 1, 14)); // NOI18N
jLabel4.setForeground(new java.awt.Color(255, 102, 0));
jLabel4.setText("Name:");
ProdName.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
ProdName.setForeground(new java.awt.Color(255, 102, 0));
jLabel5.setFont(new java.awt.Font("Arial Black", 1, 14)); // NOI18N
jLabel5.setForeground(new java.awt.Color(255, 102, 0));
jLabel5.setText("Menge:");
ProdQty.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
ProdQty.setForeground(new java.awt.Color(255, 102, 0));
ClearBtn.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
ClearBtn.setForeground(new java.awt.Color(255, 102, 0));
ClearBtn.setText("Zurücksetzen");
ClearBtn.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
ClearBtnMouseClicked(evt);
}
});
ClearBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ClearBtnActionPerformed(evt);
}
});
EditBtn.setFont(new java.awt.Font("Arial Black", 1, 12)); // NOI18N
EditBtn.setForeground(new java.awt.Color(255, 102, 0));
EditBtn.setText("Drucken");
EditBtn.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
EditBtnMouseClicked(evt);
}
});
SummeLbl.setFont(new java.awt.Font("Arial Black", 1, 14)); // NOI18N
SummeLbl.setForeground(new java.awt.Color(255, 102, 0));
SummeLbl.setText("Summe: ");
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(244, 244, 244)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel5)
.addComponent(jLabel4))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(ProdQty, javax.swing.GroupLayout.PREFERRED_SIZE, 135, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(ProdName, javax.swing.GroupLayout.PREFERRED_SIZE, 135, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(150, 150, 150)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 396, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 38, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addComponent(jLabel9)
.addGap(68, 68, 68))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addComponent(AddBtn)
.addGap(150, 150, 150)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(jLabel3)
.addGap(151, 151, 151))
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 396, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addComponent(SummeLbl)
.addGap(159, 159, 159)))
.addGap(38, 38, 38))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel2Layout.createSequentialGroup()
.addGap(85, 85, 85)
.addComponent(EditBtn)
.addGap(63, 63, 63)
.addComponent(ClearBtn)
.addContainerGap())))))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(jLabel3)
.addGap(18, 18, 18)
.addComponent(jLabel9)
.addGap(15, 15, 15)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 180, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(ProdName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4))
.addGap(18, 18, 18)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(ProdQty, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5))))
.addGap(17, 17, 17)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 178, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(AddBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(SummeLbl)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(EditBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(ClearBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)))
);
jLabel7.setFont(new java.awt.Font("Arial Black", 1, 20)); // NOI18N
jLabel7.setForeground(new java.awt.Color(255, 255, 255));
jLabel7.setText("Logout");
jLabel7.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jLabel7MouseClicked(evt);
}
});
jLabel1.setFont(new java.awt.Font("Arial Black", 1, 20)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 255, 255));
jLabel1.setText("Kasse");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1)
.addGap(342, 342, 342)
.addComponent(jLabel8)
.addContainerGap())
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(26, 26, 26)
.addComponent(jLabel7)
.addGap(18, 18, 18)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel7)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(22, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
Double Uprice, ProdTot=0.0,GrdTot=0.0;
int AvailQty;
private void ProductTableMouseClicked(java.awt.event.MouseEvent evt) {
DefaultTableModel model = (DefaultTableModel)ProductTable.getModel();
int MyIndex = ProductTable.getSelectedRow();
PrId = Integer.valueOf(model.getValueAt(MyIndex, 0).toString());
AvailQty = Integer.valueOf(model.getValueAt(MyIndex, 2).toString());
ProdName.setText(model.getValueAt(MyIndex, 1).toString());
Uprice = Double.valueOf(model.getValueAt(MyIndex, 3).toString());
}
int i = 0;
private void AddBtnMouseClicked(java.awt.event.MouseEvent evt) {
if(ProdQty.getText().isEmpty() || ProdName.getText().isEmpty() )
{
JOptionPane.showMessageDialog(this, "Fehlende Informationen");
}
else if(AvailQty <= Integer.valueOf(ProdQty.getText()))
{
JOptionPane.showMessageDialog(this, "Nicht genug auf Lager");
}
else{
i++;
ProdTot = Uprice * Double.valueOf(ProdQty.getText());
GrdTot = GrdTot+ProdTot;
if( i == 1)
{
BillTxt.setText(BillTxt.getText()+"============Tante Emma Laden============\n"+"Nummer Produkt Preis Menge Summe\n"+i+" "+ProdName.getText()+" "+Uprice+" "+ProdQty.getText()+" "+ProdTot+"\n\t");
}else
{
BillTxt.setText(BillTxt.getText()+" "+i+" "+ProdName+" "+Uprice+" "+ProdQty.getText()+" "+ProdTot+"\n");
}
SummeLbl.setText("Zu zahlen: "+GrdTot + " €");
update();
}
}
private void ClearBtnMouseClicked(java.awt.event.MouseEvent evt) {
ProdName.setText("");
BillTxt.setText("");
ProdQty.setText("");
SummeLbl.setText("Summe: ");
}
private void ClearBtnActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void EditBtnMouseClicked(java.awt.event.MouseEvent evt) {
try{
BillTxt.print();
}catch (Exception e)
{
}
}
private void jLabel8MouseClicked(java.awt.event.MouseEvent evt) {
System.exit(0);
}
private void jLabel8MouseEntered(java.awt.event.MouseEvent evt) {
jLabel8.setForeground(Color.red);
}
private void jLabel7MouseClicked(java.awt.event.MouseEvent evt) {
new Login().setVisible(true);
this.dispose();
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Selling1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Selling1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Selling1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Selling1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Selling1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton AddBtn;
private javax.swing.JTextArea BillTxt;
private javax.swing.JButton ClearBtn;
private javax.swing.JButton EditBtn;
private javax.swing.JTextField ProdName;
private javax.swing.JTextField ProdQty;
private javax.swing.JTable ProductTable;
private javax.swing.JLabel SummeLbl;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
// End of variables declaration
}
Ive tried looking for errors but there were non and

You have an object named ProdName that is lying; it's not a name at all, it's a JTextField object. It isn't text, it's a field that can contain text. That field should be named prodNameField for some example (in java we writeVariableNamesLikeThis and TypesLikeThis. You're signing yourself up for a life of annoyance if you don't adjust your style, all java code is written like that).
In your code you have this line:
BillTxt.setText(BillTxt.getText()+" "+i+" "+ProdName+" "+Uprice+" "+ProdQty.getText()+" "+ProdTot+"\n");
This calls toString() on ProdName and concatenates that to the rest of the strings in this statement. The toString of a JTextField is the 'strange text' you see. You want to [A] make that ProdName.getText(), and [B] you want to adjust all your variable names because the problem with them is that they are confusing, and this question proves that it has confused you. prodQtyField, prodNameField, etcetera.

Multiple errors generated by netbeans auto-code when inserting jButton event through GUI

I've made a jFrame and jPanel with many buttons with the Netbeans assistant.
After hours of work, in a perfectly working code, each time I try to insert a new event, the code generated by the assistant produces hundreds of errors all around the class.
Anyone have experienced this issue?
Anyone got a fix?
Thanks.
The generated code:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package prog08notes;
/**
*
* #author Diego
*/
public class VentanaMenu extends javax.swing.JFrame {
String action = "";
String historic = "";
/**
* Creates new form VentanaMenu
*/
public VentanaMenu() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form. WARNING: Do NOT modify this code. The content of this
* method is always regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPopupMenu1 = new javax.swing.JPopupMenu();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
popupMenu1 = new java.awt.PopupMenu();
jMenu3 = new javax.swing.JMenu();
jMenu4 = new javax.swing.JMenu();
jPopupMenu2 = new javax.swing.JPopupMenu();
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
codAl = new javax.swing.JTextField();
inXAR = new javax.swing.JTextField();
inWEB = new javax.swing.JTextField();
inMSO = new javax.swing.JTextField();
inPROG = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
output = new javax.swing.JTextArea();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jLabel12 = new javax.swing.JLabel();
introAs = new javax.swing.JComboBox<>();
jComboBox2 = new javax.swing.JComboBox<>();
jLabel13 = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jMenu1.setText("jMenu1");
jMenu2.setText("jMenu2");
popupMenu1.setLabel("popupMenu1");
jMenu3.setText("jMenu3");
jMenu4.setText("jMenu4");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setLocationByPlatform(true);
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel1.setText("Menú de opciones");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton1.setText("1");
jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton1MouseClicked(evt);
}
});
jButton2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton2.setText("0");
jButton3.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton3.setText("2");
jButton3.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton3MouseClicked(evt);
}
});
jButton4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton4.setText("3");
jButton4.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jButton4MouseClicked(evt);
}
});
jButton5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton5.setText("4");
jButton6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jButton6.setText("5");
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel2.setText("Introducir en la lista de alumnos");
jLabel3.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel3.setText("Visualizar la nota media del módulo");
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel4.setText("Visualizar medias de todos los alumnos");
jLabel5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel5.setText("Salir");
jLabel6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel6.setText("Visualizar nota determinada del alumno");
jLabel7.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel7.setText("Informe global del curso");
output.setEditable(false);
output.setColumns(20);
output.setRows(5);
jScrollPane1.setViewportView(output);
jLabel8.setText("COD AL");
jLabel9.setText("SiPROG");
jLabel10.setText("SiMSO");
jLabel11.setText("SiWEB");
jLabel12.setText("SiXAR");
introAs.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "SiPROG", "SiMSO", "SiWEB", "SiXAR" }));
introAs.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent evt) {
introAsItemStateChanged(evt);
}
});
introAs.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
introAsActionPerformed(evt);
}
});
jComboBox2.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jComboBox2.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent evt) {
jComboBox2ItemStateChanged(evt);
}
});
jLabel13.setText("SALIDA");
jTextArea1.setEditable(false);
jTextArea1.setBackground(getBackground());
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jTextArea1.setText("INSTRUCCIONES:\nIntroducir los datos (si se requieren) en las casillas \no menús correspondientes.\nPulsar el botón del menú deseado.\nLos datos se mostrarán en la ventana inferior.");
jTextArea1.setBorder(null);
jScrollPane2.setViewportView(jTextArea1);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 163, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 256, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(35, 35, 35)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(2, 2, 2)
.addComponent(jLabel8)
.addGap(47, 47, 47)
.addComponent(jLabel9)
.addGap(44, 44, 44)
.addComponent(jLabel10)
.addGap(58, 58, 58)
.addComponent(jLabel11)
.addGap(54, 54, 54)
.addComponent(jLabel12))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(codAl, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(inPROG, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(inMSO, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(14, 14, 14)
.addComponent(inWEB, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(inXAR, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(introAs, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(312, 312, 312)))))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jButton6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 242, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(35, 35, 35)
.addComponent(jComboBox2, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGap(18, 18, 18)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 294, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(jLabel13, javax.swing.GroupLayout.PREFERRED_SIZE, 75, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel8)
.addComponent(jLabel9)
.addComponent(jLabel10)
.addComponent(jLabel11)
.addComponent(jLabel12))
.addGap(10, 10, 10)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(inXAR, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inWEB, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inMSO, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(inPROG, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(codAl, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(introAs, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton5)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton6)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jScrollPane2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton2)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(37, 37, 37)
.addComponent(jLabel13, javax.swing.GroupLayout.PREFERRED_SIZE, 22, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 306, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void introAsActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jComboBox2ItemStateChanged(java.awt.event.ItemEvent evt) {
// TODO add your handling code here:
}
private void introAsItemStateChanged(java.awt.event.ItemEvent evt) {
String asignatura = (String) introAs.getSelectedItem();
if (asignatura.equals("SiPROG")) {cod = 1; };
if (asignatura.equals("SiMSO")) {cod = 2; };
if (asignatura.equals("SiWEB")) {cod = 3; };
if (asignatura.equals("SiXAR")) {cod = 4; };
}
private void jButton4MouseClicked(java.awt.event.MouseEvent evt) {
float media = pn.mitjanaModul(cod);
writeConsole("La nota media del módulo " + introAs.getSelectedItem()+ " es " + media + ".");
}
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {
//Creación de alumno
boolean check = true;
if (Alumno.validaCodi(codAl.getText())) {
try{
float f1 = Float.parseFloat(inPROG.getText());
if (!(0 <= f1 && 10 >= f1)) {check =false;};
float f2 = Float.parseFloat(inMSO.getText());
if (!(0 <= f2 && 10 >= f2)) {check =false;};
float f3 = Float.parseFloat(inWEB.getText());
if (!(0 <= f3 && 10 >= f3)) {check =false;};
float f4 = Float.parseFloat(inXAR.getText());
if (!(0 <= f4 && 10 >= f4)) {check =false;};
if (check) {
float grades []= {f1,f2,f3,f4};
pn.inserirAlumne(codAl.getText(), grades);
writeConsole("Insertado el alumno " + codAl.getText());
}
private void jButton3MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
else { writeConsole("Las notas deben estar entre 0 y 10.");};}
catch (Exception ex) {
writeConsole("Debes rellenar correctamente los campos del alumno.");
}}
else writeConsole("El código de alumno está formado por 3 mayúsculas y 2 dígitos.");
}
//Método de escritura en la consola
public void writeConsole (String s){
action = s;
historic = historic + "\n" + action;
output.setText(historic);
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(VentanaMenu.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new VentanaMenu().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField codAl;
private javax.swing.JTextField inMSO;
private javax.swing.JTextField inPROG;
private javax.swing.JTextField inWEB;
private javax.swing.JTextField inXAR;
private javax.swing.JComboBox<String> introAs;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JComboBox<String> jComboBox2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel12;
private javax.swing.JLabel jLabel13;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenu jMenu4;
private javax.swing.JPanel jPanel1;
private javax.swing.JPopupMenu jPopupMenu1;
private javax.swing.JPopupMenu jPopupMenu2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextArea output;
private java.awt.PopupMenu popupMenu1;
// End of variables declaration
//Variables propias
Prog08Notes pn = new Prog08Notes();
byte cod = 1;
}

Java Create an empty .ser file on resource folder if not exists yet

I want to create an empty .ser file to store an arraylist of objects if not created yet, to use later in program .I will add if not exist check later after figuring out my current problem.I am having a nullpointer exception on my File = new File(etc etc) row.Here is a better explanation with the screenshot.
edit:Added source codes
/*
* To change this license header, choose License Headers in Project
Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package dark.rusty;
import java.awt.Color;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
/**
*
* #author UoD
*/
public class Gui extends javax.swing.JFrame {
/**
* Creates new form Gui
*/
public Gui() {
initComponents();
setLocationRelativeTo(null);
setTitle("CMS - Dark&Rusty");
this.getContentPane().setBackground(new Color(190, 190, 190));
MenuItem a = new MenuItem("temp", 0, 0);
ArrayList<MenuItem> tempAList = new ArrayList<MenuItem>();
createFileIFN();
}
private void createFileIFN() {
try {
File myFile = new File((this.getClass().getResource("/text/menu.ser").toString());
if (myFile.createNewFile()) {
System.out.println("File is created!");
} else {
System.out.println("File already exists.");
}
} catch (IOException e) {
e.printStackTrace();
}
}
private ArrayList<MenuItem> getArrList(File tempFile) {
ArrayList<MenuItem> items = new ArrayList<MenuItem>();
MenuItem tempItem;
try {
FileInputStream fileIn = new FileInputStream(tempFile);
ObjectInputStream in = new ObjectInputStream(fileIn);
tempItem = (MenuItem) in.readObject();
in.close();
fileIn.close();
} catch (IOException i) {
i.printStackTrace();
} catch (ClassNotFoundException c) {
System.out.println("Employee class not found");
c.printStackTrace();
}
return items;
}
private void writeItemtoFile(MenuItem a, File tempFile) {
try {
FileOutputStream fos = new FileOutputStream(tempFile);
ObjectOutputStream oos = new ObjectOutputStream(fos);
// write object to file
oos.writeObject(a);
// closing resources
oos.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
jScrollPane2 = new javax.swing.JScrollPane();
jList2 = new javax.swing.JList<>();
jButton6 = new javax.swing.JButton();
jPanel3 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jScrollPane3 = new javax.swing.JScrollPane();
jList3 = new javax.swing.JList<>();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBackground(new java.awt.Color(190, 190, 190));
setResizable(false);
setSize(new java.awt.Dimension(800, 600));
jPanel1.setBackground(new java.awt.Color(190, 190, 190));
jPanel1.setPreferredSize(new java.awt.Dimension(800, 50));
jButton7.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Sidebar_Left_Interface_Menu_Window_1654369.png"))); // NOI18N
jButton7.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton7.setMargin(new java.awt.Insets(2, 20, 2, 20));
jButton7.setPreferredSize(new java.awt.Dimension(32, 32));
jPanel1.add(jButton7);
jButton8.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_TaskStroke_1737368.png"))); // NOI18N
jButton8.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton8.setMargin(new java.awt.Insets(2, 20, 2, 20));
jButton8.setPreferredSize(new java.awt.Dimension(32, 32));
jPanel1.add(jButton8);
jPanel2.setBackground(new java.awt.Color(190, 190, 190));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 800, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
jScrollPane2.setPreferredSize(new java.awt.Dimension(300, 120));
jList2.setBackground(new java.awt.Color(190, 190, 190));
jList2.setBorder(javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, new java.awt.Color(240, 240, 240)));
jList2.setFont(new java.awt.Font("Rockwell", 1, 14)); // NOI18N
jList2.setModel(new javax.swing.AbstractListModel<String>() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public String getElementAt(int i) { return strings[i]; }
});
jList2.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList2.setPreferredSize(new java.awt.Dimension(290, 80));
jScrollPane2.setViewportView(jList2);
jButton6.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Tick_1737369 (1).png"))); // NOI18N
jButton6.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton6.setPreferredSize(new java.awt.Dimension(32, 32));
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
jPanel3.setBackground(new java.awt.Color(190, 190, 190));
jPanel3.setPreferredSize(new java.awt.Dimension(290, 136));
jLabel1.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel1.setForeground(new java.awt.Color(51, 102, 0));
jLabel1.setText("Kalan:");
jLabel1.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel2.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel2.setForeground(new java.awt.Color(204, 0, 51));
jLabel2.setText("Odenen:");
jLabel2.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel3.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel3.setForeground(new java.awt.Color(0, 153, 255));
jLabel3.setText("0");
jLabel3.setToolTipText("");
jLabel3.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel4.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel4.setForeground(new java.awt.Color(51, 102, 0));
jLabel4.setText("5.00");
jLabel4.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel5.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel5.setForeground(new java.awt.Color(204, 0, 51));
jLabel5.setText("13.00");
jLabel5.setPreferredSize(new java.awt.Dimension(120, 30));
jLabel6.setFont(new java.awt.Font("Poiret One", 1, 24)); // NOI18N
jLabel6.setForeground(new java.awt.Color(0, 153, 255));
jLabel6.setText("İptal:");
jLabel6.setPreferredSize(new java.awt.Dimension(120, 30));
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 40, Short.MAX_VALUE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel3Layout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 13, Short.MAX_VALUE)
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
);
jButton9.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Dollar_1737376(1).png"))); // NOI18N
jButton9.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton9.setPreferredSize(new java.awt.Dimension(32, 32));
jButton10.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/if_Wrong_1737371.png"))); // NOI18N
jButton10.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
jButton10.setPreferredSize(new java.awt.Dimension(32, 32));
jScrollPane3.setPreferredSize(new java.awt.Dimension(300, 120));
jList3.setBackground(new java.awt.Color(190, 190, 190));
jList3.setBorder(javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, new java.awt.Color(240, 240, 240)));
jList3.setFont(new java.awt.Font("Rockwell", 1, 14)); // NOI18N
jList3.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList3.setPreferredSize(new java.awt.Dimension(290, 80));
jScrollPane3.setViewportView(jList3);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(6, 6, 6)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(10, 10, 10)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, 300, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 182, Short.MAX_VALUE)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE))
);
pack();
}// </editor-fold>
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Gui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Gui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JList<String> jList2;
private javax.swing.JList<String> jList3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
// End of variables declaration
}

this.getClass().getResource("/text/menu.ser")
will return null if "/text/menu.ser" does not exists. Consequently,
this.getClass().getResource("/text/menu.ser").toString()
will result in a NullPointerException.
Moreover, getResource returns an URL instance and an URL's string reprensentation (e.g. file:/home/user3524633/text/menu.ser) is not the same as a local file system path (which is what you want to use with the File constructor).
Why are you using getResource in the first place? Are you trying to determine a path relative to your application's classes?

JTextField resizing after setting text that is longer than its initial size?

This is what the textfield looks like before clicking the check button:
This is what happens after clicking check. This only happens with a string that is longer than the textfield.
This is the code from netbeans:
package filevalidator;
import java.awt.Color;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
/**
*
* #author Kosar
*/
public class Validator extends javax.swing.JFrame {
static String path1 = null;
static String path2 = null;
/**
* Creates new form Validator
*/
public Validator() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
file1path = new javax.swing.JTextField();
select1 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
file2path = new javax.swing.JTextField();
select2 = new javax.swing.JButton();
hash1 = new javax.swing.JLabel();
hash2 = new javax.swing.JLabel();
result = new javax.swing.JLabel();
checkBtn = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
jLabel1.setFont(new java.awt.Font("Trebuchet MS", 0, 18)); // NOI18N
jLabel1.setText("Original File:");
file1path.setFont(new java.awt.Font("Trebuchet MS", 0, 14)); // NOI18N
file1path.setAutoscrolls(false);
select1.setText("Select");
select1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
select1ActionPerformed(evt);
}
});
jLabel2.setFont(new java.awt.Font("Trebuchet MS", 0, 18)); // NOI18N
jLabel2.setText("Second File:");
file2path.setFont(new java.awt.Font("Trebuchet MS", 0, 14)); // NOI18N
file2path.setAutoscrolls(false);
file2path.setCursor(new java.awt.Cursor(java.awt.Cursor.TEXT_CURSOR));
select2.setText("Select");
select2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
select2ActionPerformed(evt);
}
});
hash1.setFont(new java.awt.Font("Trebuchet MS", 1, 20)); // NOI18N
hash1.setForeground(java.awt.Color.blue);
hash1.setText(" ");
hash2.setFont(new java.awt.Font("Trebuchet MS", 1, 20)); // NOI18N
hash2.setForeground(java.awt.Color.blue);
hash2.setText(" ");
result.setFont(new java.awt.Font("Trebuchet MS", 1, 20)); // NOI18N
result.setText(" ");
checkBtn.setFont(new java.awt.Font("Tahoma", 1, 13)); // NOI18N
checkBtn.setText("Check");
checkBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
checkBtnActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addGap(32, 32, 32)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(result, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(151, 151, 151)
.addComponent(hash2, javax.swing.GroupLayout.DEFAULT_SIZE, 340, Short.MAX_VALUE))
.addComponent(hash1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(30, 30, 30))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(file1path, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(file2path))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)))
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(select1, javax.swing.GroupLayout.PREFERRED_SIZE, 107, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(select2, javax.swing.GroupLayout.PREFERRED_SIZE, 107, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(checkBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 107, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(331, 331, 331))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(59, 59, 59)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(file1path, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(select1))
.addGap(27, 27, 27)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(file2path, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(select2))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 21, Short.MAX_VALUE)
.addComponent(hash1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(hash2)
.addGap(13, 13, 13)
.addComponent(result)
.addGap(5, 5, 5)
.addComponent(checkBtn, javax.swing.GroupLayout.PREFERRED_SIZE, 38, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(27, 27, 27)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(27, 27, 27))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(34, 34, 34)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
setLocationRelativeTo(null);
}// </editor-fold>
private void select1ActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Select file");
if (chooser.showOpenDialog(select1) == JFileChooser.APPROVE_OPTION) {
path1 = chooser.getSelectedFile().getAbsolutePath();
}
file1path.setText(path1);
file1path.setBackground(Color.white);
}
private void select2ActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Select file");
if (chooser.showOpenDialog(select2) == JFileChooser.APPROVE_OPTION) {
path2 = chooser.getSelectedFile().getAbsolutePath();
}
file2path.setText(path2);
file2path.setBackground(Color.white);
}
private void checkBtnActionPerformed(java.awt.event.ActionEvent evt) {
try {
HashMD5 hasher = new HashMD5();
try {
hash1.setText(hasher.hash(path1));
hash2.setText(hasher.hash(path2));
} catch (NoSuchAlgorithmException | IOException ex) {
}
if ( hash1.getText().equals(hash2.getText())) {
result.setForeground(Color.GREEN);
result.setText("Hashes are the same. File has not been modified.");
}
else {
result.setForeground(Color.RED);
result.setText("Hashes are not the same. File has been modified.");
}
} catch (NullPointerException e) {
if (file1path.getText() == null) {
file1path.setBackground(Color.red);
}
else if (file2path.getText() == null) {
file2path.setBackground(Color.red);
}
else {
file1path.setBackground(Color.red);
file2path.setBackground(Color.red);
}
}
}
/**
* #param args the command line arguments
*/
// Variables declaration - do not modify
private javax.swing.JButton checkBtn;
private javax.swing.JTextField file1path;
private javax.swing.JTextField file2path;
private javax.swing.JLabel hash1;
private javax.swing.JLabel hash2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel result;
private javax.swing.JButton select1;
private javax.swing.JButton select2;
// End of variables declaration
}

You can handle it by using TextField and its method to set columns i.e. "setColumns(int numOfCols)"
import java.awt.FlowLayout;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class TextFieldExample extends JFrame {
JFrame frame = new JFrame();
public TextFieldExample()
{
frame = new JFrame("Test");
Container container = frame.getContentPane();
JTextField fld1 = new JTextField("Java C++ C");
JTextField fld2 = new JTextField("");
JTextField fld3 = new JTextField("");
fld1.setColumns(5); //Now, it will not be resized.
fld2.setColumns(7); //Now, it will not be resized.
fld3.setColumns(9); //Now, it will not be resized.
container.setLayout(new FlowLayout());
container.add(fld1);
container.add(fld2);
container.add(fld3);
frame.setVisible(true);
frame.setSize(150,150);
}
public static void main(String[] args) {
TextFieldExample obj = new TextFieldExample();
}
}

Cannot Update SQL Server Database

In Sql Server Management Studio, i am updating database with keeping ID as primary key. From ComboBox ,i am displaying all ID and after clicking on submit button all details are displayed in jTextField correspondig to different labels having name as column in database. Here my all details are displayed getting correctly. And there is reset button which removes details of some label, even i am getting correct this alos. But i can not update tables .
I am writing the code below. Please help and whats wrong into code;
package corejavaproject;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
public class UpdateDetails extends javax.swing.JFrame
{
public UpdateDetails()
{
initComponents();
com_view();
}
private void com_view()
{
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con=DriverManager.getConnection("jdbc:sqlserver://AMISH-PC:1433;databaseName=Student","sa","comprishu");
Statement stmt=con.createStatement();
String str ="select ID from Details;";
ResultSet rs = stmt.executeQuery(str);
while(rs.next())
{
jComboBox1.addItem(rs.getString(1));
}
}
catch (ClassNotFoundException | SQLException ex)
{
ex.printStackTrace();
}
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel5 = new javax.swing.JLabel();
jComboBox1 = new javax.swing.JComboBox();
jLabel8 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jTextField6 = new javax.swing.JTextField();
jTextField5 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jTextField4 = new javax.swing.JTextField();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
jButton4 = new javax.swing.JButton();
jTextField7 = new javax.swing.JTextField();
jLabel7 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
jLabel5.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel5.setText("Department");
jComboBox1.setFont(new java.awt.Font("Tahoma", 0, 15)); // NOI18N
jLabel8.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel8.setText("Email");
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel4.setText("Aggregate Marks");
jLabel9.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel9.setText("Phone");
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 20)); // NOI18N
jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel1.setText("Update Details");
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel2.setText("Name");
jLabel6.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel6.setText("Campus Eligibilty");
jButton1.setFont(new java.awt.Font("Tahoma", 0, 16)); // NOI18N
jButton1.setText("Submit");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setFont(new java.awt.Font("Tahoma", 0, 16)); // NOI18N
jButton2.setText("Reset");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setFont(new java.awt.Font("Tahoma", 0, 16)); // NOI18N
jButton3.setText("Update");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jLabel3.setFont(new java.awt.Font("Tahoma", 0, 15)); // NOI18N
jLabel3.setText("Select Student ID");
jButton4.setFont(new java.awt.Font("Tahoma", 0, 16)); // NOI18N
jButton4.setText("Back");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jLabel7.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
jLabel7.setText("ID");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(136, 136, 136)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 132, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 132, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(104, 104, 104)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(44, 44, 44)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(68, 68, 68)
.addComponent(jButton1)
.addGap(7, 7, 7))
.addGroup(layout.createSequentialGroup()
.addGap(67, 67, 67)
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 117, Short.MAX_VALUE)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGroup(layout.createSequentialGroup()
.addGap(244, 244, 244)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 139, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(26, 26, 26))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(9, 9, 9)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 29, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 37, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel5, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jLabel9, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton2)
.addComponent(jButton3)
.addComponent(jButton4))
.addContainerGap())
);
setSize(new java.awt.Dimension(653, 511));
setLocationRelativeTo(null);
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String str = (String)jComboBox1.getSelectedItem();
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con=DriverManager.getConnection("jdbc:sqlserver://AMISH-PC:1433;databaseName=Student","sa","comprishu");
Statement stmt=con.createStatement();
String s1 = "Select * from Details where ID='"+str+"'";
ResultSet rs = stmt.executeQuery(s1);
while(rs.next())
{
String id = rs.getString(1);
String name = rs.getString(2);
String department = rs.getString(3);
Float f = rs.getFloat(4);
String marks = Float.toString(f);
String ce = rs.getString(5);
String email = rs.getString(6);
String mobile = rs.getString(7);
jTextField2.setText(name);
jTextField1.setText(department);
jTextField5.setText(marks);
jTextField3.setText(ce);
jTextField4.setText(email);
jTextField6.setText(mobile);
jTextField7.setText(id);
}
}
catch (ClassNotFoundException | SQLException ex)
{
ex.printStackTrace();
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(evt.getSource()==jButton2)
{
//jTextField2.setText("");
//jTextField1.setText("");
jTextField5.setText("");
jTextField3.setText("");
jTextField4.setText("");
jTextField6.setText("");
//jTextField7.setText("");
}
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(evt.getSource()==jButton3)
{
String str = (String)jComboBox1.getSelectedItem();
try
{
String st5=jTextField5.getText();
Float f5 = Float.parseFloat(st5);
String st3=jTextField3.getText();
String st4=jTextField4.getText();
String st6=jTextField6.getText();
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con=DriverManager.getConnection("jdbc:sqlserver://AMISH-PC:1433;databaseName=Student","sa","comprishu");
String query = "Update Details set Aggregate Marks=?,Campus Eligibilty=?,Email=?,Mobile=? where ID='"+str+"'";
PreparedStatement stmt=con.prepareStatement(query);
int rs = stmt.executeUpdate(query);
stmt.setString(4,st5);
stmt.setString(5,st3);
stmt.setString(6,st4);
stmt.setString(7,st6);
}
catch ( ClassNotFoundException | SQLException exp)
{
exp.printStackTrace();
}
}
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
new Home().setVisible(true);
this.setVisible(false);
}
public static void main(String args[]) {
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(UpdateDetails.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(UpdateDetails.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(UpdateDetails.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(UpdateDetails.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UpdateDetails().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
private javax.swing.JTextField jTextField3;
private javax.swing.JTextField jTextField4;
private javax.swing.JTextField jTextField5;
private javax.swing.JTextField jTextField6;
private javax.swing.JTextField jTextField7;
// End of variables declaration
}
Error are:
com.microsoft.sqlserver.jdbc.SQLServerException: The method executeUpdate() cannot take arguments on a PreparedStatement or CallableStatement.
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeUpdate(SQLServerPreparedStatement.java:1566)
at corejavaproject.UpdateDetails.jButton3ActionPerformed(UpdateDetails.java:298)
at corejavaproject.UpdateDetails.access$200(UpdateDetails.java:14)
at corejavaproject.UpdateDetails$3.actionPerformed(UpdateDetails.java:114)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

The problem is this part:
String query = "Update Details set Aggregate Marks=?,Campus Eligibilty=?,Email=?,Mobile=? where ID='"+str+"'";
PreparedStatement stmt=con.prepareStatement(query);
int rs = stmt.executeUpdate(query);
stmt.setString(4,st5);
stmt.setString(5,st3);
stmt.setString(6,st4);
stmt.setString(7,st6);
Your SQL contains placeholders (?), but you're calling stmt.executeUpdate() before you assign the values to those placeholders. You're also using the wrong numbers for those placeholders in those lines, it should be 1 to 4, not 4 to 7.
stmt.setString(1, st5);
stmt.setString(2, st3);
stmt.setString(3, st4);
stmt.setString(4, st6);
int rs = stmt.executeUpdate(); // shouldn't need to pass query back in