Java Get Selected Combobox from Another JFrame

Java Get Selected Combobox from Another JFrame - java

I am a newbie here. Sorry for any bad post or any other bad things.
This question is the continuation of this stackoverflow question. And I already know about the JFrame problem JFrame Bad Practice. The problem is I'm a newbie using Netbeans to code Java. All I know is how to make program with JFrame. Below is the code that I have made. Please help me correct it so the purpose of my code (set Answer class text from TheCombo class selected combobox) can be done.
Please correct this codes (I have 3 classes). I want to get the ComboBox selected Item to be used in the answer class.
Main Class:
package testing;
public class Testing {
public static void main(String[] args) {
new TheCombo().setVisible(true);
}
}
Combo Class:
package testing;
public class TheCombo extends javax.swing.JFrame {
public TheCombo() {
initComponents();
}
public String getItem()
{
String theItem = jComboBox1.getSelectedItem().toString();
return theItem;
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jComboBox1 = new javax.swing.JComboBox();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
jButton1.setText("Go");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.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(jButton1))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
new Answer().setVisible(true);
this.dispose();
}
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(TheCombo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TheCombo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TheCombo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TheCombo.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 TheCombo().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JComboBox jComboBox1;
// End of variables declaration
}
The Other Class (I want to set text the JTextField1 with selected item from the ComboBox at Combo Class):
package testing;
public class Answer extends javax.swing.JFrame {
TheCombo tc = new TheCombo();
public Answer() {
initComponents();
jTextField1.setText(tc.getItem());
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextField1.setHorizontalAlignment(javax.swing.JTextField.CENTER);
jTextField1.setEnabled(false);
jButton1.setText("Back");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
new TheCombo().setVisible(true);
this.dispose();
}
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(Answer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Answer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Answer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Answer.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 Answer().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}

There are a number of ways you might be able to achieve this, but based on the structure of your code, you seem to be wanting to ask the user a question and then based on the response, do something.
This just screams modal dialog. See How to Make Dialogs for more details
And for example...
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new QuestionPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class FruitPane extends JPanel {
private JComboBox<String> cb;
public FruitPane() {
add(new JLabel("Fruit: "));
cb = new JComboBox<String>(new String[]{"Bananas", "Apples", "Pears"});
add(cb);
}
public String getSelectedFruit() {
return (String) cb.getSelectedItem();
}
}
public class QuestionPane extends JPanel {
private JTextField field;
public QuestionPane() {
add(new JLabel("Your fruit selection"));
field = new JTextField(10);
field.setEditable(false);
add(field);
JButton btn = new JButton("Pick");
add(btn);
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
FruitPane pane = new FruitPane();
pane.setBorder(new EmptyBorder(10, 10, 10, 10));
int option = JOptionPane.showConfirmDialog(QuestionPane.this, pane, "Fruit", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if (option == JOptionPane.OK_OPTION) {
String fruit = pane.getSelectedFruit();
field.setText(fruit);
}
}
});
}
}
}

Related

Public Class in getting nothing from ArrayList

I'm working on a GUI for a programming exercise. What I expect the GUIs to do is that CLASSTEST2 would add items in an ArrayList (arrayList1) on a button click and another GUI (CLASSTEST1) would print the first item in that arraylist and the arraylist itself through a public void function printArrayList () in CLASSTEST1.
The problem is that, when I call or run the function that prints the things said above, it shows that the arrayList is empty and it throws an IndexOutOfBoundsException even though items are already added on the arraylist. Is there something I'm missing?
CLASSTEST1:
public class CLASSTEST1 extends javax.swing.JFrame {
public CLASSTEST1() {
initComponents();
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(146, 146, 146)
.addComponent(jButton1)
.addContainerGap(177, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(128, 128, 128)
.addComponent(jButton1)
.addContainerGap(140, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
CLASSTEST2 classTest2 = new CLASSTEST2();
System.out.print(classTest2.arrayList1.get(0));
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new CLASSTEST1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
CLASSTEST2:
import java.util.ArrayList;
/**
*
* #author Private
*/
public class CLASSTEST2 extends javax.swing.JFrame {
ArrayList arrayList1 = new ArrayList();
public CLASSTEST2() {
initComponents();
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
addToArrayListTEXT = new javax.swing.JTextField();
addToArrayListBTN = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addToArrayListBTN.setText("jButton1");
addToArrayListBTN.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addToArrayListBTNActionPerformed(evt);
}
});
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()
.addGap(82, 82, 82)
.addComponent(addToArrayListTEXT, javax.swing.GroupLayout.PREFERRED_SIZE, 169, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(122, 122, 122)
.addComponent(addToArrayListBTN)))
.addContainerGap(90, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(86, 86, 86)
.addComponent(addToArrayListTEXT)
.addGap(18, 18, 18)
.addComponent(addToArrayListBTN)
.addContainerGap(140, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void addToArrayListBTNActionPerformed(java.awt.event.ActionEvent evt) {
arrayList1.add(addToArrayListTEXT.getText());
}
public void printArrayList (){
System.out.println(arrayList1.get(0));
System.out.println(arrayList1);
}
/**
* #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(CLASSTEST2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(CLASSTEST2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(CLASSTEST2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(CLASSTEST2.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 CLASSTEST2().setVisible(true);
}
});
}
These small classes are just a representation of a problem I have encountered on a larger project, but I cant post it here because it's too big, but this question and classes pretty much sums it up.

Similar to the ArrayList in CLASSTEST2, you need to make the CLASSTEST2 instance a member of CLASSTEST1, and not create a new one everytime:
public class CLASSTEST1 extends javax.swing.JFrame {
private CLASSTEST2 classTest2;
private void initComponents() {
classTest2 = new CLASSTEST2();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
System.out.print(classTest2.arrayList1.get(0));
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
classtest2.setVisible(true);
}
});
}

Run file not updating changes in GUI using Swing

I'm doing a login screen with Swing. I edited the enable property of the only button that exists in the screen - the "Entrar", as shown in the picture below:
Login screen
But, when I hit Shift-F6 (Run file) it doesn't shows the change:
Login Screen after running single file
Here's the code:
package view;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
/**
*
* #author User
*/
public class Inicio extends javax.swing.JFrame {
String usuario;
String senha;
int a;
public Inicio() {
initComponents();
DocumentListener dUsuario = new DocumentListener(){
#Override
public void insertUpdate(DocumentEvent e) {
try {
usuario = e.getDocument().getText(0, 0);
a = 1;
} catch (BadLocationException ex) {
Logger.getLogger(Inicio.class.getName()).log(Level.SEVERE, null, ex);
}
}
#Override
public void removeUpdate(DocumentEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
#Override
public void changedUpdate(DocumentEvent e) {
try {
usuario = e.getDocument().getText(0, 0);
a = 1;
} catch (BadLocationException ex) {
Logger.getLogger(Inicio.class.getName()).log(Level.SEVERE, null, ex);
}
}
};
DocumentListener dSenha = new DocumentListener(){
#Override
public void insertUpdate(DocumentEvent e) {
try {
senha = e.getDocument().getText(0, 0);
a = 2;
} catch (BadLocationException ex) {
Logger.getLogger(Inicio.class.getName()).log(Level.SEVERE, null, ex);
}
}
#Override
public void removeUpdate(DocumentEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
#Override
public void changedUpdate(DocumentEvent e) {
try {
senha = e.getDocument().getText(0, 0);
a = 2;
} catch (BadLocationException ex) {
Logger.getLogger(Inicio.class.getName()).log(Level.SEVERE, null, ex);
}
}
};
tUsuario.getDocument().addDocumentListener(dUsuario);
tSenha.getDocument().addDocumentListener(dSenha);
if(a == 2) {
if (bEntrar.isEnabled() == false) {
bEntrar.setEnabled(true);
}
}else{
if (bEntrar.isEnabled() == true) {
bEntrar.setEnabled(false);
}
}
}
/**
* 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() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
tSenha = new javax.swing.JPasswordField();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
tUsuario = new javax.swing.JFormattedTextField();
bEntrar = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
jLabel1.setForeground(new java.awt.Color(153, 153, 153));
jLabel1.setText("Informe apenas os dígitos do CPF.");
jLabel2.setText("Senha:");
jLabel3.setText("CPF:");
jLabel4.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel4.setText("LOGIN");
try {
tUsuario.setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.MaskFormatter("###.###.###-##")));
} catch (java.text.ParseException ex) {
ex.printStackTrace();
}
bEntrar.setText("Entrar");
bEntrar.setEnabled(false);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(184, 184, 184)
.addComponent(jLabel4)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 91, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.TRAILING))
.addGap(7, 7, 7)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(tSenha, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(bEntrar, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 129, Short.MAX_VALUE))
.addComponent(tUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(55, 55, 55))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(50, 50, 50)
.addComponent(jLabel4)
.addGap(37, 37, 37)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(tUsuario, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(3, 3, 3)
.addComponent(jLabel1)
.addGap(9, 9, 9)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(tSenha, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 58, Short.MAX_VALUE)
.addComponent(bEntrar)
.addGap(41, 41, 41))
);
pack();
}// </editor-fold>
/**
* #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(Inicio.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Inicio.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Inicio.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Inicio.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Inicio().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton bEntrar;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPasswordField tSenha;
private javax.swing.JFormattedTextField tUsuario;
// End of variables declaration
}
I edited the button properties using the Project view from Swing. So, what can I do to fix that? Is it a Netbeans bug? I'm using Netbeans IDE 8.2, by the way.

If you want to effect the state of the button based on changes which have occurred on the text fields, then those actions need to take place in the action handlers themselves (ie, the DocumentListeners)
The following is a very basic example, which disables the "action" button until both the user name and password fields are no longer empty
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField userNameField;
private JPasswordField passwordField;
private JButton actionButton;
public TestPane() {
userNameField = new JTextField(15);
passwordField = new JPasswordField(15);
actionButton = new JButton("Do stuff");
actionButton.setEnabled(false);
DocumentListener documentListener = new DocumentListener() {
protected void stateDidChange() {
actionButton.setEnabled(userNameField.getText().length() > 0 && passwordField.getPassword().length > 0);
}
#Override
public void insertUpdate(DocumentEvent e) {
stateDidChange();
}
#Override
public void removeUpdate(DocumentEvent e) {
stateDidChange();
}
#Override
public void changedUpdate(DocumentEvent e) {
stateDidChange();
}
};
userNameField.getDocument().addDocumentListener(documentListener);
passwordField.getDocument().addDocumentListener(documentListener);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = gbc.REMAINDER;
add(userNameField, gbc);
add(passwordField, gbc);
add(actionButton, gbc);
}
}
}
Why is the initial state not been updated?
You define a as....
int a;
which gives it a initial (or default) value of 0.
You then use...
if(a == 2) {
if (bEntrar.isEnabled() == false) {
bEntrar.setEnabled(true);
}
}else{
if (bEntrar.isEnabled() == true) {
bEntrar.setEnabled(false);
}
}
to change the initial state. Since a is 0, the else block is executed, the only condition which would change the button enabled state to false would be if the current enabled state is true
But when I use Shift+F6 to run the code it doesn't work
Do a "clean and build" and run the project, not the file. In testing your code, the UI appears with the button already disabled

How to access value from one JDialog to another? [duplicate]

How do I wire output to paneWithList?
PaneWithList has a listener on its JList so that the selected row is output to the console. How can I direct that output to the JTextPane on output?
Could PaneWithList fire an event which Main picks up? Would PropertyChangeSupport suffice?
Main.java:
package dur.bounceme.net;
import javax.swing.JTabbedPane;
public class Main {
private static JTabbedPane tabs;
private static PaneWithList paneWithList;
private static PaneWithTable paneWithTable;
private static Output output;
public static void main(String[] args) {
tabs = new javax.swing.JTabbedPane();
paneWithList = new PaneWithList();
paneWithTable = new PaneWithTable();
tabs.addTab("list", paneWithList);
tabs.addTab("table", paneWithTable);
tabs.addTab("output", output);
}
}

Here's an example using the observer pattern, also seen here, here and here. Note that it would also be possible to listen to the combo's model.
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
/**
* #see http://en.wikipedia.org/wiki/Observer_pattern
* #see https://stackoverflow.com/a/10523401/230513
*/
public class PropertyChangeDemo {
public PropertyChangeDemo() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
f.add(new ObserverPanel());
f.pack();
f.setLocationByPlatform(true);
f.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
PropertyChangeDemo example = new PropertyChangeDemo();
}
});
}
}
class ObserverPanel extends JPanel {
private JLabel title = new JLabel("Value received: ");
private JLabel label = new JLabel("null", JLabel.CENTER);
public ObserverPanel() {
this.setBorder(BorderFactory.createTitledBorder("ObserverPanel"));
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(title);
panel.add(label);
this.add(panel);
ObservedPanel observed = new ObservedPanel();
observed.addPropertyChangeListener(new PropertyChangeListener() {
#Override
public void propertyChange(PropertyChangeEvent e) {
if (e.getPropertyName().equals(ObservedPanel.PHYSICIST)) {
String value = e.getNewValue().toString();
label.setText(value);
}
}
});
this.add(observed);
}
}
class ObservedPanel extends JPanel {
public static final String PHYSICIST = "Physicist";
private static final String[] items = new String[]{
"Alpher", "Bethe", "Gamow", "Dirac", "Einstein"
};
private JComboBox combo = new JComboBox(items);
private String oldValue;
public ObservedPanel() {
this.setBorder(BorderFactory.createTitledBorder("ObservedPanel"));
combo.addActionListener(new ComboBoxListener());
this.add(combo);
}
private class ComboBoxListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent ae) {
String newValue = (String) combo.getSelectedItem();
firePropertyChange(PHYSICIST, oldValue, newValue);
oldValue = newValue;
}
}
}

I'd be use JMenu with JMenuItems with contents layed by using CardLayout rather than very complicated JTabbedPane(s)

For my own reference, and for anyone using the Netbeans GUI builder, this works so far as it goes:
The PanelWithList class:
package dur.bounceme.net;
public class PanelWithList extends javax.swing.JPanel {
public PanelWithList() {
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() {
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jList1.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jList1MouseClicked(evt);
}
});
jList1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
jList1KeyReleased(evt);
}
});
jScrollPane1.setViewportView(jList1);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane2.setViewportView(jTextArea1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(54, 54, 54)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 247, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 308, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(167, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(35, 35, 35)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jScrollPane2)
.addComponent(jScrollPane1))
.addContainerGap(166, Short.MAX_VALUE))
);
}// </editor-fold>
private void jList1MouseClicked(java.awt.event.MouseEvent evt) {
row();
}
private void jList1KeyReleased(java.awt.event.KeyEvent evt) {
row();
}
// Variables declaration - do not modify
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
private void row() {
Object o = jList1.getSelectedValue();
String s = (String)o;
jTextArea1.setText(s);
this.firePropertyChange("list", -1, 1);
}
}
and Frame.java as a driver:
package dur.bounceme.net;
public class Frame extends javax.swing.JFrame {
public Frame() {
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() {
jTabbedPane1 = new javax.swing.JTabbedPane();
panelWithList1 = new dur.bounceme.net.PanelWithList();
panelWithTable1 = new dur.bounceme.net.PanelWithTable();
newJPanel1 = new dur.bounceme.net.PanelWithCombo();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
panelWithList1.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
panelWithList1PropertyChange(evt);
}
});
jTabbedPane1.addTab("tab1", panelWithList1);
jTabbedPane1.addTab("tab2", panelWithTable1);
jTabbedPane1.addTab("tab3", newJPanel1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 937, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTabbedPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 913, Short.MAX_VALUE)
.addContainerGap()))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 555, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 521, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(22, Short.MAX_VALUE)))
);
pack();
}// </editor-fold>
private void panelWithList1PropertyChange(java.beans.PropertyChangeEvent evt) {
System.out.println("panelWithList1PropertyChange ");
}
/**
* #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(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Frame.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 Frame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTabbedPane jTabbedPane1;
private dur.bounceme.net.PanelWithCombo newJPanel1;
private dur.bounceme.net.PanelWithList panelWithList1;
private dur.bounceme.net.PanelWithTable panelWithTable1;
// End of variables declaration
}
The key being that panelWithList1PropertyChange is the listener on 'panelWithList' itself.
Because PanelWithList.firePropertyChange("list", -1, 1); cannot send Object nor String that I see, I'm not exactly sure how to get the value selected all the way from the JList up to the JFrame.
Hmm, well the API says yes it can send Objects. Have to check that out.
I think it's necessary to get some info about the model which the JList is using up to the JFrame. However, doesn't that break MVC? Or maybe that's the wrong approach.

send a input String from JPanel 1 to JPanel2 [duplicate]

How do I wire output to paneWithList?
PaneWithList has a listener on its JList so that the selected row is output to the console. How can I direct that output to the JTextPane on output?
Could PaneWithList fire an event which Main picks up? Would PropertyChangeSupport suffice?
Main.java:
package dur.bounceme.net;
import javax.swing.JTabbedPane;
public class Main {
private static JTabbedPane tabs;
private static PaneWithList paneWithList;
private static PaneWithTable paneWithTable;
private static Output output;
public static void main(String[] args) {
tabs = new javax.swing.JTabbedPane();
paneWithList = new PaneWithList();
paneWithTable = new PaneWithTable();
tabs.addTab("list", paneWithList);
tabs.addTab("table", paneWithTable);
tabs.addTab("output", output);
}
}

Here's an example using the observer pattern, also seen here, here and here. Note that it would also be possible to listen to the combo's model.
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
/**
* #see http://en.wikipedia.org/wiki/Observer_pattern
* #see https://stackoverflow.com/a/10523401/230513
*/
public class PropertyChangeDemo {
public PropertyChangeDemo() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
f.add(new ObserverPanel());
f.pack();
f.setLocationByPlatform(true);
f.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
PropertyChangeDemo example = new PropertyChangeDemo();
}
});
}
}
class ObserverPanel extends JPanel {
private JLabel title = new JLabel("Value received: ");
private JLabel label = new JLabel("null", JLabel.CENTER);
public ObserverPanel() {
this.setBorder(BorderFactory.createTitledBorder("ObserverPanel"));
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(title);
panel.add(label);
this.add(panel);
ObservedPanel observed = new ObservedPanel();
observed.addPropertyChangeListener(new PropertyChangeListener() {
#Override
public void propertyChange(PropertyChangeEvent e) {
if (e.getPropertyName().equals(ObservedPanel.PHYSICIST)) {
String value = e.getNewValue().toString();
label.setText(value);
}
}
});
this.add(observed);
}
}
class ObservedPanel extends JPanel {
public static final String PHYSICIST = "Physicist";
private static final String[] items = new String[]{
"Alpher", "Bethe", "Gamow", "Dirac", "Einstein"
};
private JComboBox combo = new JComboBox(items);
private String oldValue;
public ObservedPanel() {
this.setBorder(BorderFactory.createTitledBorder("ObservedPanel"));
combo.addActionListener(new ComboBoxListener());
this.add(combo);
}
private class ComboBoxListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent ae) {
String newValue = (String) combo.getSelectedItem();
firePropertyChange(PHYSICIST, oldValue, newValue);
oldValue = newValue;
}
}
}

I'd be use JMenu with JMenuItems with contents layed by using CardLayout rather than very complicated JTabbedPane(s)

For my own reference, and for anyone using the Netbeans GUI builder, this works so far as it goes:
The PanelWithList class:
package dur.bounceme.net;
public class PanelWithList extends javax.swing.JPanel {
public PanelWithList() {
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() {
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jList1.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jList1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jList1MouseClicked(evt);
}
});
jList1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
jList1KeyReleased(evt);
}
});
jScrollPane1.setViewportView(jList1);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane2.setViewportView(jTextArea1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(54, 54, 54)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 247, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 308, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(167, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(35, 35, 35)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jScrollPane2)
.addComponent(jScrollPane1))
.addContainerGap(166, Short.MAX_VALUE))
);
}// </editor-fold>
private void jList1MouseClicked(java.awt.event.MouseEvent evt) {
row();
}
private void jList1KeyReleased(java.awt.event.KeyEvent evt) {
row();
}
// Variables declaration - do not modify
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
private void row() {
Object o = jList1.getSelectedValue();
String s = (String)o;
jTextArea1.setText(s);
this.firePropertyChange("list", -1, 1);
}
}
and Frame.java as a driver:
package dur.bounceme.net;
public class Frame extends javax.swing.JFrame {
public Frame() {
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() {
jTabbedPane1 = new javax.swing.JTabbedPane();
panelWithList1 = new dur.bounceme.net.PanelWithList();
panelWithTable1 = new dur.bounceme.net.PanelWithTable();
newJPanel1 = new dur.bounceme.net.PanelWithCombo();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
panelWithList1.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
public void propertyChange(java.beans.PropertyChangeEvent evt) {
panelWithList1PropertyChange(evt);
}
});
jTabbedPane1.addTab("tab1", panelWithList1);
jTabbedPane1.addTab("tab2", panelWithTable1);
jTabbedPane1.addTab("tab3", newJPanel1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 937, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTabbedPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 913, Short.MAX_VALUE)
.addContainerGap()))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 555, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 521, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(22, Short.MAX_VALUE)))
);
pack();
}// </editor-fold>
private void panelWithList1PropertyChange(java.beans.PropertyChangeEvent evt) {
System.out.println("panelWithList1PropertyChange ");
}
/**
* #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(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Frame.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 Frame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTabbedPane jTabbedPane1;
private dur.bounceme.net.PanelWithCombo newJPanel1;
private dur.bounceme.net.PanelWithList panelWithList1;
private dur.bounceme.net.PanelWithTable panelWithTable1;
// End of variables declaration
}
The key being that panelWithList1PropertyChange is the listener on 'panelWithList' itself.
Because PanelWithList.firePropertyChange("list", -1, 1); cannot send Object nor String that I see, I'm not exactly sure how to get the value selected all the way from the JList up to the JFrame.
Hmm, well the API says yes it can send Objects. Have to check that out.
I think it's necessary to get some info about the model which the JList is using up to the JFrame. However, doesn't that break MVC? Or maybe that's the wrong approach.

How to show the length of the text at run time even it was edited and deleted in java gui programming?

The problem is how to show the length of the text at run time even it was edited or deleted in java gui programming. Please help to fix the problem.
So here's the code:
area1.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
update();
}
#Override
public void removeUpdate(DocumentEvent e) {
update();
}
#Override
public void changedUpdate(DocumentEvent e) {
update();
}
public void update()
{
lblLength.setText(area1.getText().length()+"\160");
}
});

If all you want to do is keep track of the length of the content of the JTextArea then the DocumentListener is the correct approach, for example...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;
public class TextAreaLength {
public static void main(String[] args) {
new TextAreaLength();
}
private JLabel lengthLabel;
private JTextArea ta;
public TextAreaLength() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
ta = new JTextArea(10, 20);
ta.setWrapStyleWord(true);
ta.setLineWrap(true);
lengthLabel = new JLabel("0");
ta.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
update(e.getDocument());
}
#Override
public void removeUpdate(DocumentEvent e) {
update(e.getDocument());
}
#Override
public void changedUpdate(DocumentEvent e) {
update(e.getDocument());
}
protected void update(Document doc) {
lengthLabel.setText(Integer.toString(doc.getLength()));
}
});
lengthLabel.setHorizontalAlignment(JLabel.RIGHT);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(ta);
frame.add(lengthLabel, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
If this isn't working for you then either you've done something else wrong in your code that you're not showing us or you've not stated the problem well enough for us to understand

This is actually wrong and should not be done this way but I will leave it here for future reference
Fairly easy. You just have a KeyTyped listener and every time it gets triggered you update the number of chars.
public class NewJFrame extends javax.swing.JFrame {
public NewJFrame() {
initComponents();
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jMainPanel = new javax.swing.JPanel();
jCharsTextField = new javax.swing.JTextField();
jCharsNumLabel = new javax.swing.JLabel();
jCharsNumCounterLabel = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jCharsTextField.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
jCharsTextFieldKeyTyped(evt);
}
});
jCharsNumLabel.setText("Chars #:");
jCharsNumCounterLabel.setText(" ");
javax.swing.GroupLayout jMainPanelLayout = new javax.swing.GroupLayout(jMainPanel);
jMainPanel.setLayout(jMainPanelLayout);
jMainPanelLayout.setHorizontalGroup(
jMainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jMainPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(jMainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jCharsTextField)
.addComponent(jCharsNumLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jCharsNumCounterLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(303, Short.MAX_VALUE))
);
jMainPanelLayout.setVerticalGroup(
jMainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jMainPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jCharsTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jMainPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jCharsNumLabel)
.addComponent(jCharsNumCounterLabel))
.addContainerGap(242, 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(jMainPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jMainPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jCharsTextFieldKeyTyped(java.awt.event.KeyEvent evt) {
jCharsNumCounterLabel.setText(Integer.toString(jCharsTextField.getText().length()));
}
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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jCharsNumCounterLabel;
private javax.swing.JLabel jCharsNumLabel;
private javax.swing.JTextField jCharsTextField;
private javax.swing.JPanel jMainPanel;
// End of variables declaration
}
This is your point of interest:
private void jCharsTextFieldKeyTyped(java.awt.event.KeyEvent evt) {
jCharsNumCounterLabel.setText(Integer.toString(jCharsTextField.getText().length()));
}

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Java Get Selected Combobox from Another JFrame - java

Related

Public Class in getting nothing from ArrayList

Run file not updating changes in GUI using Swing

How to access value from one JDialog to another? [duplicate]

send a input String from JPanel 1 to JPanel2 [duplicate]

How to show the length of the text at run time even it was edited and deleted in java gui programming?

Categories

Resources