action when component state changed

action when component state changed - java

I have a series of radio buttons generated as an array and displayed in a jPanel.
I want a series of checkboxes in a second panel to be enbled when the radio buttons are in output state but not in the input (input or output are the radio choices).
I want to call the checking state method whenever any of the radiobuttons states change but don't know how to do this as they are created in an array.
Currently the method is called only when the radio button panel is actually clicked.
package my.ArduinoGUI;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
public class ArduinoGUI extends javax.swing.JFrame {
public ArduinoGUI() {
initCustomComponents();
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() {
buttonGroup1 = new javax.swing.ButtonGroup();
jPanel1 = new javax.swing.JPanel();
digitalPinPanel = new javax.swing.JPanel(new GridLayout(0, 3));
jPanel3 = new javax.swing.JPanel(new GridLayout(0, 1));
jPanel2 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Outputs"));
jPanel1.setName("Outputs"); // NOI18N
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 209, Short.MAX_VALUE)
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 106, Short.MAX_VALUE)
);
digitalPinPanel.setBorder(javax.swing.BorderFactory.createTitledBorder("Digital Pin State"));
digitalPinPanel.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseReleased(java.awt.event.MouseEvent evt) {
digitalPinPanelMouseReleased(evt);
}
});
digitalPinLabelArray = new javax.swing.JLabel[digitalPinTotal];
digitalPinRadioButtonArray = new javax.swing.JRadioButton[digitalPinTotal][2];
digitalPinGroupArray = new javax.swing.ButtonGroup[digitalPinTotal];
for(int x = 0; x < digitalPinTotal ; x++) {
digitalPinGroupArray[x] = new javax.swing.ButtonGroup(); // populate button group
digitalPinLabelArray[x] = new javax.swing.JLabel(); // populate label array
digitalPinLabelArray[x].setText("Pin " + (x +2));
digitalPinPanel.add(digitalPinLabelArray[x]); // add label to panel
for(int y = 0; y < 2; y++){
digitalPinRadioButtonArray[x][y] = new javax.swing.JRadioButton(); // populate radio button array
if (y == 0) {digitalPinRadioButtonArray[x][y].setText("Input");}
if (y == 1) {digitalPinRadioButtonArray[x][y].setText("Output"); digitalPinRadioButtonArray[x][y].setSelected(true);
}
digitalPinGroupArray[x].add(digitalPinRadioButtonArray[x][y]); // assign radio buttons to group
digitalPinPanel.add(digitalPinRadioButtonArray[x][y]); // add buttons to panel
}
}
jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("Generated Boxes"));
digitalPinOutputArray = new javax.swing.JCheckBox[digitalPinTotal];
for(int x = 0; x < digitalPinTotal ; x++) {
digitalPinOutputArray[x] = new javax.swing.JCheckBox();
digitalPinOutputArray[x].setText("Output Pin " + (x+2));
jPanel3.add(digitalPinOutputArray[x]);
}
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("Analog Pin State"));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 126, Short.MAX_VALUE)
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(18, 18, 18)
.addComponent(digitalPinPanel, javax.swing.GroupLayout.PREFERRED_SIZE, 159, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addGap(23, 23, 23)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, 199, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(digitalPinPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
.addContainerGap())
);
digitalPinPanel.getAccessibleContext().setAccessibleName("DigitalPins");
pack();
}// </editor-fold>
private void digitalPinPanelMouseReleased(java.awt.event.MouseEvent evt) {
// if output selected enable checkbox otherwise disable it
for (int x = 0; x < digitalPinTotal; x++) {
if (digitalPinRadioButtonArray[x][0].isSelected() == true) {
digitalPinOutputArray[x].setEnabled(false);
}
if (digitalPinRadioButtonArray[x][1].isSelected() == true) {
digitalPinOutputArray[x].setEnabled(true);
}
}
}
/**
* #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 ("Windows".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.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 ArduinoGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JPanel digitalPinPanel;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
// End of variables declaration
private int digitalPinTotal = 12;
private int analogPinTotal = 8;
private javax.swing.JCheckBox[] digitalPinOutputArray;
private javax.swing.JRadioButton[][] digitalPinRadioButtonArray;
private javax.swing.ButtonGroup[] digitalPinGroupArray;
private javax.swing.JLabel[] digitalPinLabelArray;
private void initCustomComponents() {
//throw new UnsupportedOperationException("Not yet implemented");
// create checkbox array
}
}

digitalPinRadioButtonArray[x][y].addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand().equals("Output"))
{
digitalPinOutputArray[2].setSelected(true);
}
}
});
try this

Related

Swing JFrame GUI window is empty when run

I've built a Higher/Lower game, using the Swing library. When I run the code I don't get any errors or warnings. The problem appears when I try running the code, the window is empty, not the way it should be.
I use NetBeans to program.There are 2 different files in my project, here is the code...
HiLoGUI.java:
import java.awt.Dimension;
import javax.swing.*;
public class HiLoGUI extends JFrame {
private JTextField txtGuess;
private JLabel outputLabel;
private int theNumber;
public void newGame() {
theNumber = (int)(Math.random() * 100 + 1);
}
public void checkGuess() {
String guessText = txtGuess.getText();
String message = "";
int guess = Integer.parseInt(guessText);
if (guess < theNumber) {
message = guess + " is too low. Try again.";
}
else if (guess > theNumber) {
message = guess + " is too high. Try again.";
}
else {
message = guess + " is correct. You win!";
}
outputLabel.setText(message);
}
public static void main(String[] args) {
HiLoGUI theGame = new HiLoGUI();
theGame.newGame();
theGame.setSize(new Dimension(450,300));
theGame.setVisible(true);
}
}
The window should look like this:
NetBeans screenshot
EDIT:
The other files code:
public class HiLoJFrame extends javax.swing.JFrame {
/**
* Creates new form HiLoJFrame
*/
public HiLoJFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
titleLabel = new javax.swing.JLabel();
chooseLabel = new javax.swing.JLabel();
txtGuess = new javax.swing.JTextField();
guessButton = new javax.swing.JButton();
outputLabel = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
setName("HiLoGame"); // NOI18N
titleLabel.setFont(new java.awt.Font("SansSerif", 1, 24)); // NOI18N
titleLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
titleLabel.setText("High/Lower Game");
titleLabel.setVerticalAlignment(javax.swing.SwingConstants.TOP);
chooseLabel.setFont(new java.awt.Font("SansSerif", 0, 15)); // NOI18N
chooseLabel.setText("Guess a name between 1 to 100");
txtGuess.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
txtGuessActionPerformed(evt);
}
});
guessButton.setFont(new java.awt.Font("Ubuntu", 0, 18)); // NOI18N
guessButton.setText("Guess");
guessButton.setCursor(new java.awt.Cursor(java.awt.Cursor.MOVE_CURSOR));
guessButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
guessButtonActionPerformed(evt);
}
});
outputLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
outputLabel.setText("Enter a number and press Guess");
outputLabel.setVerticalAlignment(javax.swing.SwingConstants.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()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap(50, Short.MAX_VALUE)
.addComponent(chooseLabel)
.addGap(18, 18, 18)
.addComponent(txtGuess, javax.swing.GroupLayout.PREFERRED_SIZE, 69, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(136, 136, 136)
.addComponent(guessButton, javax.swing.GroupLayout.PREFERRED_SIZE, 114, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(78, 78, 78)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(titleLabel)
.addComponent(outputLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 237, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(titleLabel)
.addGap(75, 75, 75)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(txtGuess, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(chooseLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 23, Short.MAX_VALUE)
.addComponent(guessButton, javax.swing.GroupLayout.PREFERRED_SIZE, 43, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(53, 53, 53)
.addComponent(outputLabel)
.addGap(35, 35, 35))
);
titleLabel.getAccessibleContext().setAccessibleDescription("");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 422, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap()))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 346, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap()))
);
getAccessibleContext().setAccessibleName("HiLoGame");
pack();
}// </editor-fold>
private void txtGuessActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void guessButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
HiLoGUI hilogui = new HiLoGUI();
hilogui.checkGuess();
}
/**
* #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(HiLoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(HiLoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(HiLoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(HiLoJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
new HiLoJFrame().setVisible(true);
});
}
// Variables declaration - do not modify
private javax.swing.JLabel chooseLabel;
private javax.swing.JButton guessButton;
private javax.swing.JPanel jPanel1;
private javax.swing.JLabel outputLabel;
private javax.swing.JLabel titleLabel;
private javax.swing.JTextField txtGuess;
// End of variables declaration
}
EDIT2:
I've changed the main class of HiLoGUI.java
I was creating a wrong object.
New main:
public static void main(String[] args) {
HiLoJFrame theGame = new HiLoJFrame();
theGame.newGame();
theGame.setSize(new Dimension(450,300));
theGame.setVisible(true);
}
Now it claims that I need to create that method (newGame) in the JFrame file.

You are calling a method from the wrong class, according to the Swing docs, it is not needed to create a new JFrame object, so setting its visibility is enough. Check this out: How To Call JFrame from another Java class

Why does my program freeze/crash when i try to run it?

This is not a complete program but im wondering why it freezez when i press the "JButton". I am Currently working on a dice game and so far its going fine but i cant understand why it wont run at the moment. Thanks for the help in beforehand :)
PS. The problem started after i added the while loop in the method diceLogic.
/*
* 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 dicegame_leonardasp;
/**
*
* #author LeoAsp
*/
import java.awt.Dimension;
import java.awt.Image;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.util.Random;
import javafx.scene.control.Cell;
public class DiceGameGui extends javax.swing.JFrame {
//Instansvariabel
//Skapa instans av Randomklassen
Random rand = new Random();
public DiceGameGui() {
initComponents();
}
public String doMessage() {
String message = "";
return message;
}
public String doReDice() {
String image = "";
int randNum = rand.nextInt(6 - 1) + 1;
if (randNum == 1) {
image = "one.gif";
} else if (randNum == 2) {
image = "two.gif";
} else if (randNum == 3) {
image = "three.gif";
} else if (randNum == 4) {
image = "four.gif";
} else if (randNum == 5) {
image = "five.gif";
} else if (randNum == 6) {
image = "six.gif";
} else {
dispose();
}
return image;
}
public void diceLogic(int players, int dice) {
jDiceResult.removeAll();
jDiceResult.setLayout(new java.awt.GridLayout(6, 5));
JLabel playersArray[][] = new JLabel[players][dice];
int j;
int i;
for (i = 0; i <= players; i++) {
for (j = 0; j < dice; j++) {
playersArray[i][j] = new JLabel();
playersArray[i][j].setIcon(new ImageIcon(doReDice()));
playersArray[i][j].setPreferredSize(new Dimension(60, 50));
// playersArray[i][j].setPreferredSize(new Dimension(20, 20));
//playersArray[i][j].setMinimumSize(new Dimension(20, 20));
//playersArray[i][j].setMaximumSize(new Dimension(20, 20));
jDiceResult.add(playersArray[i][j]);
jDiceResult.revalidate();
jDiceResult.repaint();
}
while (j <= 6) {
jDiceResult.add(javax.swing.Box.createGlue());
}
}
}
/**
* 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();
jLabel3 = new javax.swing.JLabel();
jBoxPlayers = new javax.swing.JComboBox();
jBoxDice = new javax.swing.JComboBox();
jBtnRoll = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jButton1 = new javax.swing.JButton();
jDiceResult = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Menlo", 0, 18)); // NOI18N
jLabel1.setText("Players:");
jLabel2.setFont(new java.awt.Font("Menlo", 0, 18)); // NOI18N
jLabel2.setText("Dice:");
jLabel3.setFont(new java.awt.Font("Menlo", 0, 18)); // NOI18N
jBoxPlayers.setFont(new java.awt.Font("Menlo", 1, 14)); // NOI18N
jBoxPlayers.setModel(new javax.swing.DefaultComboBoxModel(new String[] {
"1", "2", "3", "4", "5"
}));
jBoxPlayers.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBoxPlayersActionPerformed(evt);
}
});
jBoxDice.setFont(new java.awt.Font("Menlo", 1, 14)); // NOI18N
jBoxDice.setModel(new javax.swing.DefaultComboBoxModel(new String[] {
"1", "2", "3", "4", "5", "6"
}));
jBoxDice.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBoxDiceActionPerformed(evt);
}
});
jBtnRoll.setFont(new java.awt.Font("Menlo", 0, 18)); // NOI18N
jBtnRoll.setText("Roll the Dice");
jBtnRoll.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jBtnRollActionPerformed(evt);
}
});
jTextArea1.setEditable(false);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
jButton1.setFont(new java.awt.Font("Menlo", 0, 14)); // NOI18N
jButton1.setText("Show Highscore");
jDiceResult.setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
jDiceResult.setPreferredSize(new java.awt.Dimension(250, 300));
javax.swing.GroupLayout jDiceResultLayout = new javax.swing.GroupLayout(jDiceResult);
jDiceResult.setLayout(jDiceResultLayout);
jDiceResultLayout.setHorizontalGroup(
jDiceResultLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 246, Short.MAX_VALUE)
);
jDiceResultLayout.setVerticalGroup(
jDiceResultLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 296, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 175, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jBoxPlayers, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(91, 91, 91)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel3))
.addComponent(jBoxDice, javax.swing.GroupLayout.PREFERRED_SIZE, 88, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jScrollPane1, 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.LEADING)
.addComponent(jBtnRoll, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jDiceResult, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap())
);
layout.setVerticalGroup(
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.BASELINE)
.addComponent(jLabel1)
.addComponent(jLabel2)
.addComponent(jLabel3))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jBoxPlayers, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jBoxDice, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jBtnRoll, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 347, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jDiceResult, 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))
);
pack();
} // </editor-fold>
private void jBoxPlayersActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jBoxDiceActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jBtnRollActionPerformed(java.awt.event.ActionEvent evt) {
int dice = Integer.parseInt(jBoxDice.getSelectedItem().toString());
int players = Integer.parseInt(jBoxPlayers.getSelectedItem().toString());
diceLogic(players, dice);
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info: javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(DiceGameGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(DiceGameGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(DiceGameGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(DiceGameGui.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 DiceGameGui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JComboBox jBoxDice;
private javax.swing.JComboBox jBoxPlayers;
private javax.swing.JButton jBtnRoll;
private javax.swing.JButton jButton1;
private javax.swing.JPanel jDiceResult;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
}

This is the problem:
while (j <= 6) {
jDiceResult.add(javax.swing.Box.createGlue());
}
With this line, you create a infinite loop, because you check whether j<=6 but don't change the value of j, so j<=6 is always true.
I guess you want to change while to if.

I guess:
while (j <= 6) {
jDiceResult.add(javax.swing.Box.createGlue());
}
I think may be it should be:
if (j <= 6) {
jDiceResult.add(javax.swing.Box.createGlue());
}

Having trouble converting textfield to integer and more

a little information on my assignment:
Based on the Person class previously defined, design your own Java application that displays a form for a user to enter their name, year_of_birth and employment status. The provided data will be used to instantiate a Person object. The form should also include a JButton and a JTextField. When the user clicks on the JButton the application should display “Welcome [name]! You are [age] old. Time has been kind to you.”, where [name] and [age] are the current values of the name and age attributes of the Person object.
I am a little new to creating GUI's. I have used the jFrame design that allows me to create the design of the GUI. I am having trouble using that form to display the results. Specifically, having the button display the results, having there name stored in a variable once they type it in, and brining up a dialog box once the button is clicked with the message.
package my.userFormUI;
/**
*
* #author Randy
*/
public class userFormUI extends javax.swing.JFrame {
/**
* Creates new form userFormUI
*/
public userFormUI() {
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")
int age;
int year;
public int getAge(int year_of_birth){//get year method
age = 2014 - year_of_birth;
return age;
}//end method
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jDialog1 = new javax.swing.JDialog();
jDialog2 = new javax.swing.JDialog();
jDialog3 = new javax.swing.JDialog();
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
name = new javax.swing.JTextField();
year_of_birth = new javax.swing.JTextField();
jRadioButton1 = new javax.swing.JRadioButton();
jRadioButton2 = new javax.swing.JRadioButton();
jButton1 = new javax.swing.JButton();
javax.swing.GroupLayout jDialog1Layout = new javax.swing.GroupLayout(jDialog1.getContentPane());
jDialog1.getContentPane().setLayout(jDialog1Layout);
jDialog1Layout.setHorizontalGroup(
jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
jDialog1Layout.setVerticalGroup(
jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
javax.swing.GroupLayout jDialog2Layout = new javax.swing.GroupLayout(jDialog2.getContentPane());
jDialog2.getContentPane().setLayout(jDialog2Layout);
jDialog2Layout.setHorizontalGroup(
jDialog2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
jDialog2Layout.setVerticalGroup(
jDialog2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
javax.swing.GroupLayout jDialog3Layout = new javax.swing.GroupLayout(jDialog3.getContentPane());
jDialog3.getContentPane().setLayout(jDialog3Layout);
jDialog3Layout.setHorizontalGroup(
jDialog3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
jDialog3Layout.setVerticalGroup(
jDialog3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "User Information", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Times New Roman", 1, 12), new java.awt.Color(0, 0, 0))); // NOI18N
jLabel1.setText("NAME:");
jLabel2.setText("YEAR BORN:");
jLabel3.setText("EMPLOYMENT STATUS:");
name.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nameActionPerformed(evt);
}
});
year_of_birth.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
year_of_birthActionPerformed(evt);
}
});
jRadioButton1.setText("Employed");
jRadioButton2.setText("Unemployed");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jRadioButton2)
.addComponent(jRadioButton1))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(name, javax.swing.GroupLayout.PREFERRED_SIZE, 196, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(year_of_birth, javax.swing.GroupLayout.DEFAULT_SIZE, 41, 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(jLabel1)
.addComponent(jLabel2)
.addComponent(name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(year_of_birth, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(jRadioButton1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jRadioButton2)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jButton1.setText("SUBMIT");
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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(39, 39, 39)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(14, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(104, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
This is where my coding needs to begin.
private void year_of_birthActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
int year = Integer.parseInt(year_of_birth.getText());
getAge(year);
}//attempted to convert a string to an integer here
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here
System.out.println("Welcome" + name + " ! You are " + getAge(year) + " old. Time has been kind to you.");
}//Code for button here
private void nameActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}//name text field
/**
* #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(userFormUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(userFormUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(userFormUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(userFormUI.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 userFormUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JDialog jDialog1;
private javax.swing.JDialog jDialog2;
private javax.swing.JDialog jDialog3;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JRadioButton jRadioButton1;
private javax.swing.JRadioButton jRadioButton2;
private javax.swing.JTextField name;
private javax.swing.JTextField year_of_birth;
// End of variables declaration
}
Any help would be greatly appreciated. I am already past the due date and very confused on how coding for GUI's go.

There is whole lot of unnecessary code you have. you need to clean it up for example you have 3 dialog instances. you do not need them. coming to your question you need to write implementation like:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// This will display message
JOptionPane.showMessageDialog(this, "Welcome" + name.getText() + " ! You are " + getAge(Integer.parseInt(year_of_berth.getText())) + " old. Time has been kind to you.");
// here you need to write code to populate your Person Object.
}
Hope this helps

You don't need a event for every textField. This:
name.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nameActionPerformed(evt);
}
});
year_of_birth.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
year_of_birthActionPerformed(evt);
}
});
I wipe this fragment of code.
You only need an event when the user click the button, therefore this event what you'll need.
Instead of the methods nameActionPerformed() and year_of_birthActionPerformed(), I would create a getName() and getYearOfBirth() methods.
private String getName(){
return name.getText();
}
private int getYearOfBirth(){
return Integer.parseInt(year_of_birth.getText());
}
Then, in the method of button event:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String name = getName();
int year = getYearOfBirth();
System.out.println("Welcome" + name + " ! You are " + getAge(year) + " old. Time has been kind to you.");
}

Using the append to print out to a textArea from a list

So, from my previous question I decided to go ahead and use the list as recommended (Thank you for that).
I've got a single class now that uses a list. This list is updated through the button. When a user presses on the button, values within the textfield are parsed to double and saved into the list. I am trying to create a method to be placed into the button that will print out the list.
import java.util.ArrayList;
public class foodDept extends javax.swing.JFrame {
ArrayList<MyShoppingCart> list = new ArrayList<MyShoppingCart>();
public foodDept() {
initComponents();
}
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
appleLabel = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
cartArea = new javax.swing.JTextArea();
jLabel1 = new javax.swing.JLabel();
appleField = new javax.swing.JTextField();
bananaField = new javax.swing.JTextField();
addTocart = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
appleLabel.setText("Apple ($1.99):");
cartArea.setColumns(20);
cartArea.setRows(5);
jScrollPane1.setViewportView(cartArea);
cartArea.setEditable(false);
jLabel1.setText("Banana ($0.99):");
addTocart.setText("Add to Cart");
addTocart.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addTocartActionPerformed(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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(appleLabel)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(appleField)
.addGap(44, 44, 44))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(addTocart)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(bananaField, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 35, Short.MAX_VALUE)))
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(appleLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(appleField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(21, 21, 21)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(bananaField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 96, Short.MAX_VALUE)
.addComponent(addTocart))
.addComponent(jScrollPane1))
.addContainerGap())
);
pack();
}// </editor-fold>
**// HEEEEEEERRRRRRRRRRRREEEEEEEEEEEEEEEEEEEEEE
void printList() {
cartArea.setText("");
for (int i = 0; i < list.length; i++){
cartArea.append(list[i].toString());
}//******** ^ THIS IS THE METHOD IM TALKING ABOUT (printList)^*******
}**
**private void addTocartActionPerformed(java.awt.event.ActionEvent evt) {
double a = Double.parseDouble(appleField.getText());
list.add(new MyShoppingCart(a));
double b = Double.parseDouble(bananaField.getText());
list.add(new MyShoppingCart(b));
appleField.setText("");
bananaField.setText("");
printList();
} //where the values are parsed**
/**
* #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(foodDept.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(foodDept.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(foodDept.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(foodDept.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 foodDept().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton addTocart;
private javax.swing.JTextField appleField;
private javax.swing.JLabel appleLabel;
private javax.swing.JTextField bananaField;
private javax.swing.JTextArea cartArea;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
// End of variables declaration
}

You try to use List as an Array, but it's wrong.
Use next:
for (int i = 0; i < list.size(); i++){
cartArea.append(list.get(i).toString());
}
list.size() like a array.length
and list.get(i) as array[i]
Read tutorial for List.

Adding JCheckBox Array to JPanel in Netbeans

I've been trying to add an array of JCheckBoxes to a JPanel in Netbeans that has been automatically generated by the Netbeans GUI, when I create an array of the JCheckBoxes and then try to add them to the JPanel using JPanel.add(jCheckboxArray[x]) , the program compiles ok but they don't appear.
I've created an array like so:
// custom private member variables
private javax.swing.JCheckBox[] jCheckboxArray;
//
int CheckBoxNumber = 5;
jCheckboxArray = new javax.swing.JCheckBox[CheckBoxNumber];
for(int x = 0; x < CheckBoxNumber ; x++) {
jCheckboxArray[x] = new javax.swing.JCheckBox();
jCheckboxArray[x].setText("CheckBox " + x);
}
I've tried setting viable but no result, and all the examples online appear to make a reference to adding the JPanel to a JFrame however no JFrame exists in the auto-generated code probably because the auto generated class extends javax.swing.JFrame.
Any help greatly appreciated.
Here is the entire code:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package my.ArduinoGUI;
/**
*
* #author EEE
*/
public class ArduinoGUI extends javax.swing.JFrame {
/**
* Creates new form ArduinoGUI
*/
public ArduinoGUI() {
initCustomComponents();
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() {
buttonGroup1 = new javax.swing.ButtonGroup();
jPanel1 = new javax.swing.JPanel();
jCheckBox1 = new javax.swing.JCheckBox();
jCheckBox2 = new javax.swing.JCheckBox();
jCheckBox3 = new javax.swing.JCheckBox();
jCheckBox4 = new javax.swing.JCheckBox();
jCheckBox5 = new javax.swing.JCheckBox();
jPanel2 = new javax.swing.JPanel();
jRadioButton1 = new javax.swing.JRadioButton();
jRadioButton2 = new javax.swing.JRadioButton();
jPanel3 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Outputs"));
jPanel1.setName("Outputs"); // NOI18N
jCheckBox1.setText("jCheckBox1");
jCheckBox2.setText("jCheckBox2");
jCheckBox3.setText("jCheckBox3");
jCheckBox4.setText("jCheckBox4");
jCheckBox5.setText("jCheckBox5");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jCheckBox1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jCheckBox5))
.addComponent(jCheckBox2)
.addComponent(jCheckBox3)
.addComponent(jCheckBox4))
.addContainerGap(39, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jCheckBox1)
.addComponent(jCheckBox5))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jCheckBox2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jCheckBox3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jCheckBox4)
.addGap(0, 14, Short.MAX_VALUE))
);
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder("PinState"));
buttonGroup1.add(jRadioButton1);
jRadioButton1.setText("Input");
jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton1ActionPerformed(evt);
}
});
buttonGroup1.add(jRadioButton2);
jRadioButton2.setText("Output");
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(8, 8, 8)
.addComponent(jRadioButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jRadioButton2)
.addContainerGap(67, Short.MAX_VALUE))
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(16, 16, 16)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jRadioButton1)
.addComponent(jRadioButton2))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("Generated Boxes"));
int CheckBoxNumber = 5;
jCheckboxArray = new javax.swing.JCheckBox[CheckBoxNumber];
for(int x = 0; x < CheckBoxNumber ; x++) {
jCheckboxArray[x] = new javax.swing.JCheckBox();
System.out.print(x);
System.out.print(jCheckboxArray[x].getText());
jCheckboxArray[x].setText("CheckBox " + x);
System.out.print(jCheckboxArray[x].getText());
jPanel3.add(jCheckboxArray[x]);
}
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 175, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 40, Short.MAX_VALUE)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGap(23, 23, 23)
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
pack();
}// </editor-fold>
private void jRadioButton1ActionPerformed(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 ("Windows".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ArduinoGUI.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 ArduinoGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JCheckBox jCheckBox1;
private javax.swing.JCheckBox jCheckBox2;
private javax.swing.JCheckBox jCheckBox3;
private javax.swing.JCheckBox jCheckBox4;
private javax.swing.JCheckBox jCheckBox5;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JRadioButton jRadioButton1;
private javax.swing.JRadioButton jRadioButton2;
// End of variables declaration
private javax.swing.JCheckBox[] jCheckboxArray;
private javax.swing.JPanel jPanel4;
private javax.swing.JCheckBox jCheckBox6;
private void initCustomComponents() {
//throw new UnsupportedOperationException("Not yet implemented");
// create checkbox array
}
}

I have given the example
public static void main(String args[]) {
String title = (args.length == 0 ? "CheckBox Sample" : args[0]);
JFrame frame = new JFrame(title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
Border border = BorderFactory.createTitledBorder("Test");
panel.setBorder(border);
javax.swing.JCheckBox[] jCheckboxArray;
//
int CheckBoxNumber = 5;
jCheckboxArray = new javax.swing.JCheckBox[CheckBoxNumber];
for(int x = 0; x < CheckBoxNumber ; x++) {
jCheckboxArray[x] = new javax.swing.JCheckBox();
jCheckboxArray[x].setText("CheckBox " + x);
panel.add(jCheckboxArray[x]);
}
Container contentPane = frame.getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
// contentPane.add(button, BorderLayout.SOUTH);
frame.setSize(300, 200);
frame.setVisible(true);
}

Develop Reference

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

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