如何动态创建8 * 8 Jbuttons板 。并有另外3个按钮（A，B，C，D）
然后我如何使用ActionListenet以便用户在单击“A按钮”时，电路板中的某些Jbuttons将改变其背景
我只知道如何更改我点击的按钮而不是其他按钮!!! 我是怎么做到的？
package test;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
public class test2 extends javax.swing.JFrame implements ActionListener {
public JPanel contentPane;
public int GameBoardWidth = 800;
public int GameBoardHeight = 900;
public int ReservedHeight = 100;
public final int ButtonRows = 5;
public final int ButtonColumns = 5;
private int ButtonCount = 0;
private JButton[] GameControlButtons = new JButton[4];
public test2() {
initComponents();
this.contentPane = new JPanel();
this. contentPane.setOpaque(true);
this.contentPane.setBackground(Color.LIGHT_GRAY);
this.contentPane.setLayout(null);
this.makeGameBoard();
this.setContentPane(contentPane);
this.setSize(GameBoardWidth, GameBoardHeight);
this.setLocationByPlatform(true);
this.setVisible(true);
}
public void makeGameBoard()
{
// Splatter all the buttons
for (int i = 0; i < this.ButtonRows; i++)
{
for (int j = 0; j < this.ButtonColumns; j++)
{
this.MakeGameButton(i, j);
//this.MakeGameButton3(i, j);
}
}
// Make Game Control Buttons
for (int i = 0; i < 4; i++)
{
this.MakeGameControlButton(i);
}
}
public void MakeGameButton(int X, int Y)
{
int ButtonWidth = this.GameBoardWidth/this.ButtonColumns;
int ButtonHeight = this.GameBoardHeight/this.ButtonRows;
ButtonWidth -= 3;
ButtonHeight -= 25;
JButton button = new JButton();
button.setName("GameButton," + X +"," + Y);
button.setSize(ButtonWidth, ButtonHeight);
Font myFont = new Font("Serif", Font.BOLD, 36);
button.setFont(myFont);
// Generate Random Number for button
Random Rn = new Random();
button.setText("");
button.setToolTipText(Integer.toString(Rn.nextInt(11)));
// Compute Button Location
int XCoor = X * ButtonWidth;
int YCoor = (this.ReservedHeight/2) + Y * ButtonHeight;
button.setLocation(XCoor, YCoor);
//Add action listener to button
button.addActionListener(this);
this.contentPane.add(button);
}
public void MakeGameControlButton(int X)
{
int ButtonWidth = 2 * this.GameBoardWidth/this.ButtonColumns;
int ButtonHeight = this.GameBoardHeight/this.ButtonRows;
ButtonWidth -= 5;
ButtonHeight -= 25;
JButton button = new JButton();
button.setName("GameControlButton" + X);
button.setSize(ButtonWidth, ButtonHeight);
button.setBackground(Color.cyan);
Font myFont = new Font("Serif", Font.BOLD, 48);
button.setFont(myFont);
// Compute Button Location
int XCoor = X * ButtonWidth;
int YCoor = this.GameBoardHeight - (ButtonHeight + 60);
button.setLocation(XCoor, YCoor);
//Add action listener to button
button.addActionListener(this);
GameControlButtons[ButtonCount] = button;
ButtonCount++;
this.contentPane.add(button);
}
/**
* 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() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(test2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(test2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(test2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(test2.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 test2().setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
@Override
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
答案 0 :(得分：1)
您遇到的问题是将JButton封装在方法中。因此，您无法从方法外部访问它。相反，让方法返回JButton
public JButton MakeGameButton(int X, int Y) {
JButton button = new JButton();
....
return button;
}
然后你可以在其他地方引用该按钮。
JButton button1 = MakeGameButton(...);
JButton button2 = MakeGameButton(...);
JButton buttonA = new JButton("A Button");
buttonA.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
button1.setBackground(...);
}
});