Develop Reference

Junit Testing for GUI

I have following Simple Utility Calculator
Now i want to apply some Junit Testing here.
I don't know how to perform a Junit testing on Gui.
So kindly help me out.
Code is:
/*
* 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 calculator;
import java.io.*;
import java.text.DecimalFormat;
/**
*
* #author owner
*/
public class Calculator_Utility extends javax.swing.JFrame {
/**
* Creates new form Calculator_Utility
*/
public Calculator_Utility() {
initComponents();UsePowerKw.setText("4.0");
}
/**
* 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.
*/
private void setComponentsName(){
AddButton.setName("Add");
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
CostPerKW = new javax.swing.JLabel();
SelectAppliance = new javax.swing.JLabel();
PowerUsage = new javax.swing.JLabel();
NumberHoursUse = new javax.swing.JLabel();
TotalCostApp = new javax.swing.JLabel();
AddButton = new javax.swing.JButton();
CostPerKwTextField = new javax.swing.JTextField();
UsePowerKw = new javax.swing.JTextField();
HourUse = new javax.swing.JTextField();
CostApp = new javax.swing.JTextField();
AllTotal = new javax.swing.JLabel();
AllTotalApp = new javax.swing.JTextField();
SelectApp = new javax.swing.JComboBox<>();
Showfield = new javax.swing.JTextField();
GallonWater = new javax.swing.JLabel();
GallonWat = new javax.swing.JTextField();
Export = new javax.swing.JButton();
CostGallon = new javax.swing.JLabel();
CostGall = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
CostPerKW.setText("Cost Per KW Hour:");
SelectAppliance.setText("Select Appliance:");
PowerUsage.setText("Power Usage In KW Hours:");
NumberHoursUse.setText("Number of Hours use per day:");
TotalCostApp.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
TotalCostApp.setText("Total Cost For Appliance");
AddButton.setText("ADD");
AddButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
AddButtonActionPerformed(evt);
}
});
CostPerKwTextField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CostPerKwTextFieldActionPerformed(evt);
}
});
UsePowerKw.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
UsePowerKwActionPerformed(evt);
}
});
AllTotal.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
AllTotal.setText("Total of All Appliances");
SelectApp.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Refrigerator", "Washer", "Dryer", "Freezer", "Air Conditioner" }));
SelectApp.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
SelectAppActionPerformed(evt);
}
});
GallonWater.setText("Gallon of Water:");
Export.setText("Export");
Export.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExportActionPerformed(evt);
}
});
CostGallon.setText("Cost Per Gallon:");
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()
.addGroup(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.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(NumberHoursUse)
.addComponent(SelectAppliance)
.addComponent(PowerUsage)
.addComponent(CostPerKW))
.addComponent(CostGallon, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(GallonWater, javax.swing.GroupLayout.Alignment.TRAILING))
.addGap(4, 4, 4))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(AllTotal)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(CostPerKwTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(UsePowerKw, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(HourUse, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(SelectApp, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(AllTotalApp, javax.swing.GroupLayout.PREFERRED_SIZE, 99, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(GallonWat, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(CostGall, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addComponent(Showfield, javax.swing.GroupLayout.PREFERRED_SIZE, 270, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 21, Short.MAX_VALUE)
.addComponent(Export)))
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(TotalCostApp)
.addGap(4, 4, 4)
.addComponent(CostApp, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(AddButton)
.addGap(24, 24, 24))
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {AllTotalApp, CostApp, CostGall, CostPerKwTextField, GallonWat, HourUse, SelectApp, UsePowerKw});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(CostPerKW)
.addComponent(CostPerKwTextField, 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.BASELINE)
.addComponent(SelectAppliance)
.addComponent(SelectApp, 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.BASELINE)
.addComponent(PowerUsage)
.addComponent(UsePowerKw, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(6, 6, 6)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(NumberHoursUse)
.addComponent(HourUse, 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)
.addComponent(GallonWat, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(GallonWater)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(CostGallon)
.addComponent(CostGall, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 29, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(CostApp, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(TotalCostApp))
.addComponent(AddButton))
.addGap(13, 13, 13)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(AllTotalApp, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(AllTotal))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(Showfield, javax.swing.GroupLayout.PREFERRED_SIZE, 136, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Export))
.addContainerGap())
);
pack();
}// </editor-fold>
//Declare Variables and intialize the variables
private void AddButtonActionPerformed(java.awt.event.ActionEvent evt) {
double answer;
double total = 0;
String s = SelectApp.getSelectedItem().toString();
//Check if user select "Washer" from drop down box, calculate usage with Gallon
if (s=="Washer") {
//DecimalFormat df= new DecimalFormat("#.##");
number1 = (int)((Double.parseDouble(CostPerKwTextField.getText())));
number2 = (int)((Double.parseDouble(UsePowerKw.getText())));
number3 = (int)((Double.parseDouble(HourUse.getText())));
number4 = (int)((Double.parseDouble(GallonWat.getText())));
answer = number1*number2*number3;
total =+ answer;
CostApp.setText(String.valueOf(answer + "\n"));
Showfield.setText(String.valueOf("The appliance run a total of " + answer + "\n"));
}
//if user select any appliances other than washer calculate usage
else
number1 = (int)((Double.parseDouble(CostPerKwTextField.getText())));
number2 = (int)((Double.parseDouble(UsePowerKw.getText())));
number3 = (int)((Double.parseDouble(HourUse.getText())));
answer = number1*number2*number3;
total =+ answer;
//Calculated amount is put into field
CostApp.setText(String.valueOf(answer + "\n"));
Showfield.setText(String.valueOf("The appliance run a total of " + answer + "\n"));
// TODO add your handling code here:
}
//Action listener/Events for JCombo. Pre-defined Power Usage for Each Appliacnes
private void SelectAppActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String s=SelectApp.getSelectedItem().toString();
double r=4;
double w=7;
double x=12;
double y=16;
double z=24;
if (s=="Refrigerator"){
UsePowerKw.setText(String.valueOf(r));
}
else if (s=="Washer") {UsePowerKw.setText(String.valueOf(w));}
else if (s=="Dryer") {UsePowerKw.setText(String.valueOf(x));}
else if (s=="Freezer") {UsePowerKw.setText(String.valueOf(y));}
else UsePowerKw.setText(String.valueOf(z));
}
private void UsePowerKwActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
//If jComboBox1 = "Refrigerator" then set jTextField4 = 22
}
//Action Listener/Event creates Data.txt with output
private void ExportActionPerformed(java.awt.event.ActionEvent evt) {
File file = new File("Data.txt");
try (Writer writer = new BufferedWriter(new FileWriter(file))) {
String contents = Showfield.getText();
//"The quick brown fox" +
//System.getProperty("line.separator") +
//"jumps over the lazy dog.";
writer.write(contents);
} catch (IOException e) {
e.printStackTrace();
}
}
private void CostPerKwTextFieldActionPerformed(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(Calculator_Utility.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Calculator_Utility.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Calculator_Utility.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Calculator_Utility.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 Calculator_Utility().setVisible(true);
}
});
}
public double number1, number2, number3, number4;
// Variables declaration - do not modify
private javax.swing.JButton AddButton;
private javax.swing.JLabel AllTotal;
private javax.swing.JTextField AllTotalApp;
private javax.swing.JTextField CostApp;
private javax.swing.JTextField CostGall;
private javax.swing.JLabel CostGallon;
private javax.swing.JLabel CostPerKW;
private javax.swing.JTextField CostPerKwTextField;
private javax.swing.JButton Export;
private javax.swing.JTextField GallonWat;
private javax.swing.JLabel GallonWater;
private javax.swing.JTextField HourUse;
private javax.swing.JLabel NumberHoursUse;
private javax.swing.JLabel PowerUsage;
private javax.swing.JComboBox<String> SelectApp;
private javax.swing.JLabel SelectAppliance;
private javax.swing.JTextField Showfield;
private javax.swing.JLabel TotalCostApp;
private javax.swing.JTextField UsePowerKw;
// End of variables declaration
}
Any testCase you can apply like proper working , (actual== expected Result) etc.

You can't test the GUI with JUnit. You can only test the methods.
For example you have a JButton with an actionListener witch calls the method calculate(1, 1):
JButton showDialogButton = new JButton("Text Button");
showDialogButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
calculate(1, 1);
}
});
private int calculate(int n1, int n2){
return n1 + n2;
}
Now, You cant test the JButton but you can test the method "calculate". We know that calculate(1, 1) will return us 2 so we test it:
assertEquals(2, calculate(1, 1));
This means, that you cannot "press the button with JUnit" but you can test the action the button does.

Java: NullPointerException in Jframe when hiding buttons

I am working on a quiz for a school assignment and i am attempting to create a GUI using JFrame. I had an idea to make all the buttons invisible and only appear after clicking the start button. However when I attempted to do so by using the .setVisible(false) command in the main method, it gives me a nullpointerexception. I am unsure about whats wrong and I am hoping someone could give me some pointers. Here's my code:
import javax.swing.JOptionPane;
public class QuizGUI extends javax.swing.JFrame {
/**
* Creates new form QuizGUI
*/
public QuizGUI() {
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() {
jButton4 = new javax.swing.JButton();
jPanel1 = new javax.swing.JPanel();
Q1 = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
Q2 = new javax.swing.JButton();
jPanel3 = new javax.swing.JPanel();
Q3 = new javax.swing.JButton();
jPanel4 = new javax.swing.JPanel();
Q4 = new javax.swing.JButton();
jPanel5 = new javax.swing.JPanel();
Q5 = new javax.swing.JButton();
jPanel7 = new javax.swing.JPanel();
Bonus = new javax.swing.JButton();
Exit = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jPanel6 = new javax.swing.JPanel();
Start = new javax.swing.JButton();
EndQuiz = new javax.swing.JButton();
Timer = new javax.swing.JLabel();
jButton4.setText("jButton4");
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
Q1.setText("Question 1");
Q1.addChangeListener(new javax.swing.event.ChangeListener() {
public void stateChanged(javax.swing.event.ChangeEvent evt) {
Q1StateChanged(evt);
}
});
Q1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Q1ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addGap(33, 33, 33)
.addComponent(Q1, javax.swing.GroupLayout.DEFAULT_SIZE, 145, Short.MAX_VALUE)
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(Q1, javax.swing.GroupLayout.PREFERRED_SIZE, 47, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(11, 11, 11))
);
Q1.getAccessibleContext().setAccessibleName("Question1");
Q2.setText("Question 2");
Q2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Q2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addContainerGap(35, Short.MAX_VALUE)
.addComponent(Q2, javax.swing.GroupLayout.PREFERRED_SIZE, 146, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(13, 13, 13)
.addComponent(Q2, javax.swing.GroupLayout.PREFERRED_SIZE, 47, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
Q2.getAccessibleContext().setAccessibleName("Question2");
Q3.setText("Question 3");
Q3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Q3ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
.addContainerGap(32, Short.MAX_VALUE)
.addComponent(Q3, javax.swing.GroupLayout.PREFERRED_SIZE, 149, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(9, 9, 9))
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addComponent(Q3, javax.swing.GroupLayout.DEFAULT_SIZE, 46, Short.MAX_VALUE)
.addContainerGap())
);
Q3.getAccessibleContext().setAccessibleName("Question3");
Q4.setText("Question 4");
Q4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Q4ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);
jPanel4.setLayout(jPanel4Layout);
jPanel4Layout.setHorizontalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel4Layout.createSequentialGroup()
.addContainerGap(38, Short.MAX_VALUE)
.addComponent(Q4, javax.swing.GroupLayout.PREFERRED_SIZE, 147, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
jPanel4Layout.setVerticalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel4Layout.createSequentialGroup()
.addGap(13, 13, 13)
.addComponent(Q4, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
Q4.getAccessibleContext().setAccessibleName("Question4\n");
Q5.setText("Question 5");
Q5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
Q5ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel5Layout = new javax.swing.GroupLayout(jPanel5);
jPanel5.setLayout(jPanel5Layout);
jPanel5Layout.setHorizontalGroup(
jPanel5Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel5Layout.createSequentialGroup()
.addGap(37, 37, 37)
.addComponent(Q5, javax.swing.GroupLayout.PREFERRED_SIZE, 147, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(34, Short.MAX_VALUE))
);
jPanel5Layout.setVerticalGroup(
jPanel5Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel5Layout.createSequentialGroup()
.addGap(13, 13, 13)
.addComponent(Q5, javax.swing.GroupLayout.PREFERRED_SIZE, 50, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
Q5.getAccessibleContext().setAccessibleName("Question5");
Bonus.setText("Bonus");
Bonus.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
BonusActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel7Layout = new javax.swing.GroupLayout(jPanel7);
jPanel7.setLayout(jPanel7Layout);
jPanel7Layout.setHorizontalGroup(
jPanel7Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel7Layout.createSequentialGroup()
.addGap(9, 9, 9)
.addComponent(Bonus)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel7Layout.setVerticalGroup(
jPanel7Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel7Layout.createSequentialGroup()
.addGap(31, 31, 31)
.addComponent(Bonus)
.addContainerGap(34, Short.MAX_VALUE))
);
Exit.setText("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
}
});
jLabel1.setFont(new java.awt.Font("Vivaldi", 1, 48)); // NOI18N
jLabel1.setText("Quiz");
jLabel2.setFont(new java.awt.Font("Tahoma", 0, 35)); // NOI18N
Start.setText("Start");
Start.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
StartActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel6Layout = new javax.swing.GroupLayout(jPanel6);
jPanel6.setLayout(jPanel6Layout);
jPanel6Layout.setHorizontalGroup(
jPanel6Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel6Layout.createSequentialGroup()
.addComponent(Start)
.addGap(0, 32, Short.MAX_VALUE))
);
jPanel6Layout.setVerticalGroup(
jPanel6Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel6Layout.createSequentialGroup()
.addContainerGap()
.addComponent(Start)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
EndQuiz.setText("End Quiz");
EndQuiz.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
EndQuizActionPerformed(evt);
}
});
Timer.setText("jLabel3");
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(jPanel7, javax.swing.GroupLayout.PREFERRED_SIZE, 110, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(73, 73, 73)
.addComponent(EndQuiz)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 92, Short.MAX_VALUE)
.addComponent(Exit, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2)
.addGap(116, 116, 116))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel5, 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(Timer)
.addGap(71, 71, 71))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(EndQuiz)
.addGap(56, 56, 56))
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 76, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(26, 26, 26)
.addComponent(jPanel6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(22, 22, 22)
.addComponent(jPanel4, javax.swing.GroupLayout.PREFERRED_SIZE, 77, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanel5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(70, 70, 70)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(Exit, javax.swing.GroupLayout.PREFERRED_SIZE, 44, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(Timer)
.addGap(168, 168, 168))))))
);
pack();
}// </editor-fold>
private void Q1StateChanged(javax.swing.event.ChangeEvent evt) {
// TODO add your handling code here:
}
private void Q1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String Q1 = (String) JOptionPane.showInputDialog( //Question 1
null,
Question.getQuestionMCQ(1),
"Q1",
JOptionPane.QUESTION_MESSAGE,
null,
Question.Options(0),
Question.Options(0)[1]
);
JOptionPane.showMessageDialog(
null,
Question.checkAnswerMCQ (Q1,1));
if (Question.getScore()<1) {
jLabel2.setText(Integer.toString(Question.getScore()));
Q2.setVisible(true); //Q1
}
else {}
}
private void Q2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String Q2 = (String) JOptionPane.showInputDialog( //Question 2
null,
Question.getQuestionMCQ(2),
"Q2",
JOptionPane.QUESTION_MESSAGE,
null,
Question.Options(1),
Question.Options(1)[1]
);
JOptionPane.showMessageDialog(
null,
Question.checkAnswerMCQ (Q2,2));
if (Question.getScore()<2) {
jLabel2.setText(Integer.toString(Question.getScore()));
Q3.setVisible(true); //Q2
}
else {}
}
private void Q3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String Q3 = JOptionPane.showInputDialog(
null,
Question.getQuestionOE(1),
"Q3",
JOptionPane.QUESTION_MESSAGE);
JOptionPane.showMessageDialog(
null,
Question.checkAnswerOE(Q3, 1));
if (Question.getScore() <3) {
jLabel2.setText(Integer.toString(Question.getScore()));
Q4.setVisible(true); //Q3
}
else {}
}
private void Q4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String Q4 = JOptionPane.showInputDialog(
null,
Question.getQuestionOE(2),
"Q4",
JOptionPane.QUESTION_MESSAGE);
JOptionPane.showMessageDialog(
null,
Question.checkAnswerOE(Q4, 2));
if (Question.getScore() < 4) {
jLabel2.setText(Integer.toString(Question.getScore()));
Q5.setVisible(true); //Q4
}
else {}
}
private void Q5ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String Q5 = JOptionPane.showInputDialog(
null,
Question.getQuestionOE(3),
"Q5",
JOptionPane.QUESTION_MESSAGE);
JOptionPane.showMessageDialog(
null,
Question.checkAnswerOE(Q5, 3));
if (Question.getScore() < 5) {
jLabel2.setText(Integer.toString(Question.getScore()));
EndQuiz.setVisible(true);
}
else if (Question.getScore()==5) {
Bonus.setVisible(true);
}
else {}
}
private void BonusActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
BonusButtonPicture s =new BonusButtonPicture();
s.setVisible(true);
}
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
}
private void StartActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jLabel2.setText(Integer.toString(Question.restartScore()));
Q1.setVisible(true);
Start.setVisible(false);
}
private void EndQuizActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
JOptionPane.showMessageDialog(null, "Thanks for taking the quiz! You have acheived a score of " +Question.getScore());
int retry = JOptionPane.showConfirmDialog(null, "Do you want to take the quiz again?");
switch (retry) {
case JOptionPane.NO_OPTION: //ends the program
JOptionPane.showMessageDialog(null,"End of quiz");
System.exit(0);
break;
case JOptionPane.YES_OPTION: jLabel2.setText(Integer.toString(Question.restartScore())); //restarts
Question.randomizeQuestionsMCQ();
Question.randomizeQuestionsOpenEnded();
Start.setVisible(true);
break;
case JOptionPane.CLOSED_OPTION: System.exit(0); //closes the program
}
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
Question.randomizeQuestionsMCQ();
Question.randomizeQuestionsOpenEnded();
/* 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(QuizGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(QuizGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(QuizGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(QuizGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
new QuizGUI().setVisible(true);
});
Q1.setVisible(false);
Q2.setVisible(false);
Q3.setVisible(false);
Q4.setVisible(false);
Q5.setVisible(false);
Bonus.setVisible(false);
EndQuiz.setVisible(false);
}
// Variables declaration - do not modify
private static javax.swing.JButton Bonus;
private static javax.swing.JButton EndQuiz;
private javax.swing.JButton Exit;
private static javax.swing.JButton Q1;
private static javax.swing.JButton Q2;
private static javax.swing.JButton Q3;
private static javax.swing.JButton Q4;
private static javax.swing.JButton Q5;
private static javax.swing.JButton Start;
private static javax.swing.JLabel Timer;
private javax.swing.JButton jButton4;
private javax.swing.JLabel jLabel1;
private static javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JPanel jPanel5;
private javax.swing.JPanel jPanel6;
private javax.swing.JPanel jPanel7;
// End of variables declaration
}
The error appears in the main method
public static void main(String args[]) {
//code
Q1.setVisible(false); //Error here
Q2.setVisible(false);
Q3.setVisible(false);
Q4.setVisible(false);
Q5.setVisible(false);
Bonus.setVisible(false);
EndQuiz.setVisible(false);
}
Thanks in advance!

You are initializing the buttons inside the constructor of your class which is called after the
Q1.setVisible(false);
Q2.setVisible(false);
Q3.setVisible(false);
Q4.setVisible(false);
Q5.setVisible(false);
Bonus.setVisible(false);
EndQuiz.setVisible(false);
part of code which causes the exception. What you need to do is include this snippet inside
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
new QuizGUI().setVisible(true);
});
and it should be OK.

Output Changing from JFrame to Java Result [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 7 years ago.
Improve this question
I have been running a JFrame in NetBeans to test it and all of a sudden the output changed from a display of the JFrame to:
Java Result: -1073740940
I do not know what caused this as I did not change anything in the run method and it is effecting all of my JFrame programs. Does anybody have any idea what is causing this? Is it a glitch in the program or did I accidentally toggled a setting NetBeans has that I'm not aware of?
UPDATE:
Here is the code to the program as requested by someone, but as I stated before it affects multiple projects that use a JFrame
/*
* 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 imeannumbers;
import javax.swing.BorderFactory;
import javax.swing.border.TitledBorder;
/**
*
* #author Kanto Ruki
*/
public class Main extends javax.swing.JFrame {
/**
* Creates new form Main
*/
boolean decimalUsed = false;
public Main() {
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() {
tabGrouping = new javax.swing.JTabbedPane();
tabNumPad = new javax.swing.JPanel();
txtBox = new javax.swing.JTextField();
btnOne = new javax.swing.JButton();
btnTwo = new javax.swing.JButton();
btnThree = new javax.swing.JButton();
btnFour = new javax.swing.JButton();
btnFive = new javax.swing.JButton();
btnSix = new javax.swing.JButton();
btnSeven = new javax.swing.JButton();
btnEight = new javax.swing.JButton();
btnNine = new javax.swing.JButton();
btnDecimal = new javax.swing.JButton();
btnZero = new javax.swing.JButton();
btnEnter = new javax.swing.JButton();
tabAchievements = new javax.swing.JScrollPane();
jPanel1 = new javax.swing.JPanel();
lbl00 = new javax.swing.JLabel();
lbl01 = new javax.swing.JLabel();
lbl03 = new javax.swing.JLabel();
lbl05 = new javax.swing.JLabel();
lbl07 = new javax.swing.JLabel();
lbl13 = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jPanel4 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("I Mean Numbers");
txtBox.setEditable(false);
txtBox.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
txtBox.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.LOWERED));
btnOne.setText("1");
btnOne.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnOneActionPerformed(evt);
}
});
btnTwo.setText("2");
btnTwo.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnTwoActionPerformed(evt);
}
});
btnThree.setText("3");
btnThree.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnThreeActionPerformed(evt);
}
});
btnFour.setText("4");
btnFour.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnFourActionPerformed(evt);
}
});
btnFive.setText("5");
btnFive.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnFiveActionPerformed(evt);
}
});
btnSix.setText("6");
btnSix.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnSixActionPerformed(evt);
}
});
btnSeven.setText("7");
btnSeven.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnSevenActionPerformed(evt);
}
});
btnEight.setText("8");
btnEight.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnEightActionPerformed(evt);
}
});
btnNine.setText("9");
btnNine.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnNineActionPerformed(evt);
}
});
btnDecimal.setText(".");
btnDecimal.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnDecimalActionPerformed(evt);
}
});
btnZero.setText("0");
btnZero.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnZeroActionPerformed(evt);
}
});
btnEnter.setText("Enter");
btnEnter.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnEnterActionPerformed(evt);
}
});
javax.swing.GroupLayout tabNumPadLayout = new javax.swing.GroupLayout(tabNumPad);
tabNumPad.setLayout(tabNumPadLayout);
tabNumPadLayout.setHorizontalGroup(
tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(tabNumPadLayout.createSequentialGroup()
.addGap(82, 82, 82)
.addGroup(tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(tabNumPadLayout.createSequentialGroup()
.addComponent(btnDecimal, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnEnter, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(tabNumPadLayout.createSequentialGroup()
.addComponent(btnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(tabNumPadLayout.createSequentialGroup()
.addComponent(btnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(tabNumPadLayout.createSequentialGroup()
.addComponent(btnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 73, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(txtBox))
.addContainerGap(77, Short.MAX_VALUE))
);
tabNumPadLayout.setVerticalGroup(
tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(tabNumPadLayout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(txtBox, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnOne, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnTwo, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnThree, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnFour, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnFive, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnSix, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnSeven, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnEight, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnNine, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(tabNumPadLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnDecimal, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnZero, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(btnEnter, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
tabGrouping.addTab("NumPad", tabNumPad);
lbl00.setText("??");
lbl00.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
lbl01.setText("??");
lbl01.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
lbl03.setText("??");
lbl03.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
lbl05.setText("??");
lbl05.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
lbl07.setText("??");
lbl07.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
lbl13.setText("??");
lbl13.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "?????", javax.swing.border.TitledBorder.RIGHT, javax.swing.border.TitledBorder.BOTTOM));
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(34, 34, 34)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lbl05, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lbl07, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lbl13, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lbl00, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lbl01, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(lbl03, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(42, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lbl03)
.addComponent(lbl01)
.addComponent(lbl00))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(lbl05)
.addComponent(lbl07)
.addComponent(lbl13))
.addContainerGap(141, Short.MAX_VALUE))
);
tabAchievements.setViewportView(jPanel1);
tabGrouping.addTab("Achievements", tabAchievements);
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 390, Short.MAX_VALUE)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 232, Short.MAX_VALUE)
);
tabGrouping.addTab("How To Play", jPanel3);
javax.swing.GroupLayout jPanel4Layout = new javax.swing.GroupLayout(jPanel4);
jPanel4.setLayout(jPanel4Layout);
jPanel4Layout.setHorizontalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 390, Short.MAX_VALUE)
);
jPanel4Layout.setVerticalGroup(
jPanel4Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 232, Short.MAX_VALUE)
);
tabGrouping.addTab("About", jPanel4);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabGrouping)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabGrouping)
);
pack();
setLocationRelativeTo(null);
}// </editor-fold>
private void btnOneActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "1");
}
private void btnTwoActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "2");
}
private void btnThreeActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "3");
}
private void btnFourActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "4");
}
private void btnFiveActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "5");
}
private void btnSixActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "6");
}
private void btnSevenActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "7");
}
private void btnEightActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "8");
}
private void btnNineActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "9");
}
private void btnDecimalActionPerformed(java.awt.event.ActionEvent evt) {
if (!decimalUsed) {
txtBox.setText(txtBox.getText() + ".");
decimalUsed = true;
}
}
private void btnZeroActionPerformed(java.awt.event.ActionEvent evt) {
txtBox.setText(txtBox.getText() + "0");
}
private void btnEnterActionPerformed(java.awt.event.ActionEvent evt) {
String check = txtBox.getText();
TitledBorder title = BorderFactory.createTitledBorder("title");
title.setTitleJustification(TitledBorder.RIGHT);
title.setTitlePosition(TitledBorder.BOTTOM);
switch (check) {
case "00":
title.setTitle("The Beginning...");
lbl00.setBorder(title);
lbl00.setText("00");
break;
case "01":
title.setTitle("Your the First");
lbl01.setBorder(title);
lbl01.setText("01");
break;
default:
break;
}
decimalUsed = false;
txtBox.setText("");
}
/**
* #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(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Main.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 Main().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btnDecimal;
private javax.swing.JButton btnEight;
private javax.swing.JButton btnEnter;
private javax.swing.JButton btnFive;
private javax.swing.JButton btnFour;
private javax.swing.JButton btnNine;
private javax.swing.JButton btnOne;
private javax.swing.JButton btnSeven;
private javax.swing.JButton btnSix;
private javax.swing.JButton btnThree;
private javax.swing.JButton btnTwo;
private javax.swing.JButton btnZero;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jPanel4;
private javax.swing.JLabel lbl00;
private javax.swing.JLabel lbl01;
private javax.swing.JLabel lbl03;
private javax.swing.JLabel lbl05;
private javax.swing.JLabel lbl07;
private javax.swing.JLabel lbl13;
private javax.swing.JScrollPane tabAchievements;
private javax.swing.JTabbedPane tabGrouping;
private javax.swing.JPanel tabNumPad;
private javax.swing.JTextField txtBox;
// End of variables declaration
}
UPDATE2:
Thanks to #Willshackleford, I found that the problem is occurring in the main execution in the EventQueue
public static void invokeLater(Runnable runnable) {
Toolkit.getEventQueue().postEvent(
new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));
}
With the Error Message Variable information not available, source compiled without -g option

You may have toggled a setting. If you select your project, and choose Properties in the pop-up menu and then select the category run. There are a couple of properties that would mess things up. The main class could be changed to a class other than your JFrame class. Setting the platform to a JDK version you don't have installed or have a broken installation for etc.
Probably the best way to debug would be to select the project and choose Debug -> Step Into or press F7 from them menu. This will start your program but immediately pause it so you can step through it one line at a time by pressing F7 (Step Into) or F8 (Step Over) for each line. If it starts stepping into the wrong class you will no you need to fix the main class property. If it starts ok but exits early you will want to look carefully at the last line before it exits.

I have an error with my if statement [duplicate]

This question already exists:
If statement for jframe main method doesn't work [duplicate]
Closed 7 years ago.
I'm new to java, I'm trying to select shape using jframe and then display the area using console output, I tried using it as follow, but it's giving me an error. Not sure how to do an if statement, it says non static variable can't be referenced from static context. How to fix my code?
Thank you in advance
public class design extends javax.swing.JFrame {
int type;
int xtl, ytl, xtr, ytr, xbl, ybl,xbr, ybr;
/**
* Creates new form design
*/
public design() {
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() {
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();
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();
jTextField1 = new javax.swing.JTextField();
jTextField2 = new javax.swing.JTextField();
jTextField3 = new javax.swing.JTextField();
jTextField4 = new javax.swing.JTextField();
jTextField5 = new javax.swing.JTextField();
jTextField6 = new javax.swing.JTextField();
jTextField7 = new javax.swing.JTextField();
jTextField8 = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Quadrilateral");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("Rectangle");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("Parallelogram");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton4.setText("Square");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton5.setText("Trapezoid");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
jLabel1.setText("X:");
jLabel2.setText("Y:");
jLabel3.setText("Top left point");
jLabel4.setText("Top right point");
jLabel5.setText("Bottom left point");
jLabel6.setText("Bottom right point");
jTextField1.setText(" ");
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jTextField2.setText(" ");
jTextField2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField2ActionPerformed(evt);
}
});
jTextField3.setText(" ");
jTextField3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField3ActionPerformed(evt);
}
});
jTextField4.setText(" ");
jTextField4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField4ActionPerformed(evt);
}
});
jTextField5.setText(" ");
jTextField5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField5ActionPerformed(evt);
}
});
jTextField6.setText(" ");
jTextField6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField6ActionPerformed(evt);
}
});
jTextField7.setText(" ");
jTextField7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField7ActionPerformed(evt);
}
});
jTextField8.setText(" ");
jTextField8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField8ActionPerformed(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(24, 24, 24)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addGap(47, 47, 47)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(90, 90, 90)
.addComponent(jButton4)
.addGap(142, 142, 142)
.addComponent(jButton5)
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 40, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jTextField1)
.addComponent(jTextField5))
.addComponent(jLabel3))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(39, 39, 39)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(58, 58, 58)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(67, 67, 67)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(44, 44, 44)
.addComponent(jLabel4)
.addGap(27, 27, 27)
.addComponent(jLabel5)
.addGap(32, 32, 32)
.addComponent(jLabel6)))
.addGap(137, 137, 137))))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1)
.addGap(148, 148, 148)
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2)
.addGap(75, 75, 75))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton3)
.addComponent(jButton2))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton4)
.addComponent(jButton5))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 73, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(jLabel4)
.addComponent(jLabel5)
.addComponent(jLabel6))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jTextField8, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel2)
.addComponent(jTextField5, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(43, 43, 43))
);
pack();
}// </editor-fold>
private void jTextField7ActionPerformed(java.awt.event.ActionEvent evt) {
ybl = Integer.parseInt(jTextField7.getText()); }
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
type =1;
// TODO add your handling code here:
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
type =2;
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
type =3;
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
type =4;
// TODO add your handling code here:
}
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {
type =5;
// TODO add your handling code here:
}
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
xtl = Integer.parseInt(jTextField1.getText());
}
private void jTextField5ActionPerformed(java.awt.event.ActionEvent evt) {
ytl = Integer.parseInt(jTextField5.getText());
}
private void jTextField3ActionPerformed(java.awt.event.ActionEvent evt) {
xtr = Integer.parseInt(jTextField3.getText());
}
private void jTextField6ActionPerformed(java.awt.event.ActionEvent evt) {
ytr = Integer.parseInt(jTextField6.getText());
}
private void jTextField4ActionPerformed(java.awt.event.ActionEvent evt) {
xbl = Integer.parseInt(jTextField4.getText());
}
private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {
xbr = Integer.parseInt(jTextField2.getText());
}
private void jTextField8ActionPerformed(java.awt.event.ActionEvent evt) {
ybr = Integer.parseInt(jTextField8.getText());
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
if (type==1){
System.out.println("Qoordinates of Quadrilateral are");
}
if (type==2){
System.out.println("Text2");
}
/* 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(design.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(design.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(design.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(design.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() {
System.out.println("Hello World");
new design().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.JButton jButton5;
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.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;
private javax.swing.JTextField jTextField8;
// End of variables declaration
}

(Style nit: your design class should be named Design.)
In your main method, you hadn't created a new Design object yet. You can only access type for a Design instance.

NetBeans Java Project Won't Display GUI Window Despite No Error

I am trying to build a java project using Netbeans IDE 7.1.
I somehow can't see or view the GUI window that I have created.
Please kindly advise.
In my class:
package rmiSimpleCalc;
public class RMISimpleCalculatorMain {
public static void main(String[] args) {
MainCalculator calc = new MainCalculator();
calc.setVisible(true);
}
}
the MainCalculator is the GUI window I would like to run. It somehow wont't display.
There is NO error message in my console tough..
Here is the MainCalculator code:
package rmiSimpleCalc;
import java.rmi.*;
public class MainCalculator extends javax.swing.JPanel {
public MainCalculator() {
initComponents();
ComboBoxOperator.addItem("+");
ComboBoxOperator.addItem("-");
ComboBoxOperator.addItem("/");
ComboBoxOperator.addItem("*");
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
txtFirstDigit = new javax.swing.JTextField();
txtSecondDigit = new javax.swing.JTextField();
btnCalculate = new javax.swing.JButton();
lblFirstDigit = new javax.swing.JLabel();
lblSecondDigit = new javax.swing.JLabel();
ComboBoxOperator = new javax.swing.JComboBox();
lblOperator = new javax.swing.JLabel();
lblResult = new javax.swing.JLabel();
lblHeader = new javax.swing.JLabel();
btnConfigureServer = new javax.swing.JButton();
txtResult = new javax.swing.JTextField();
btnCalculate.setText("Calculate");
btnCalculate.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnCalculateActionPerformed(evt);
}
});
lblFirstDigit.setText("First Digit");
lblSecondDigit.setText("Second Digit");
ComboBoxOperator.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
lblOperator.setText("Operator");
lblResult.setText("Result");
lblHeader.setText("RMI Simple Calculator");
btnConfigureServer.setText("Configure Server");
btnConfigureServer.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnConfigureServerActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblFirstDigit, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(lblSecondDigit, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(lblOperator, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(lblResult, javax.swing.GroupLayout.Alignment.TRAILING))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lblHeader)
.addGroup(layout.createSequentialGroup()
.addComponent(ComboBoxOperator, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(btnCalculate))
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(txtSecondDigit)
.addComponent(txtFirstDigit, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(txtResult, javax.swing.GroupLayout.PREFERRED_SIZE, 125, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(btnConfigureServer)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(12, 12, 12)
.addComponent(lblHeader)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtFirstDigit, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lblFirstDigit))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(txtSecondDigit, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lblSecondDigit))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(ComboBoxOperator, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(lblOperator)
.addComponent(btnCalculate))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(lblResult)
.addComponent(txtResult, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(btnConfigureServer)
.addContainerGap(24, Short.MAX_VALUE))
);
}
private void btnConfigureServerActionPerformed(java.awt.event.ActionEvent evt) {
}
private void btnCalculateActionPerformed(java.awt.event.ActionEvent evt) {
double firstdigit;
double seconddigit;
String operator;
firstdigit = Double.valueOf(txtFirstDigit.getText());
seconddigit = Double.valueOf(txtSecondDigit.getText());
operator = ComboBoxOperator.getSelectedItem().toString();
try
{
CoreInterface coreobj = (CoreInterface) Naming.lookup("localhost/Core");
double result = (coreobj.calc(firstdigit,seconddigit,operator));
txtResult.setText(Double.toString(result));
}
catch(Exception e)
{
txtResult.setText("e");
}
}
private javax.swing.JComboBox ComboBoxOperator;
private javax.swing.JButton btnCalculate;
private javax.swing.JButton btnConfigureServer;
private javax.swing.JLabel lblFirstDigit;
private javax.swing.JLabel lblHeader;
private javax.swing.JLabel lblOperator;
private javax.swing.JLabel lblResult;
private javax.swing.JLabel lblSecondDigit;
private javax.swing.JTextField txtFirstDigit;
private javax.swing.JTextField txtResult;
private javax.swing.JTextField txtSecondDigit;
// End of variables declaration
}
Any advise is appreciated.

The MainCalculator class is a JPanel. A JPanel can't just be displayed like that, it has to be part of a Window. Add it to a JFrame and call setVisible(true) on the JFrame.
Also, #npinti's advice is very good: execute GUI-related code in the EDT thread.

The issue is most likely in this section:
public static void main(String[] args) {
MainCalculator calc = new MainCalculator();
calc.setVisible(true);
}
You need to make any GUI related tasks within the Event Dispatcher Thread (EDT).
Try something like so:
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
MainCalculator calc = new MainCalculator();
calc.setVisible(true);
}
});
}