package week10;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
public class ButtonDemo extends JPanel implements ActionListener {
protected JButton b1, b2, b3;
public ButtonDemo() {
b1 = new JButton("Disable middle button");
b1.setVerticalTextPosition(AbstractButton.CENTER);
b1.setHorizontalTextPosition(AbstractButton.LEADING); //aka LEFT, for left-to-right locales
b1.setMnemonic(KeyEvent.VK_D);
b1.setActionCommand("disable");
b2 = new JButton("Middle button");
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b2.setHorizontalTextPosition(AbstractButton.CENTER);
b2.setMnemonic(KeyEvent.VK_M);
b3 = new JButton("Enable middle button");
b3.setActionCommand("enable");
b3.setEnabled(false);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b1.setToolTipText("Click this button to disable the middle button.");
b2.setToolTipText("This middle button does nothing when you click it.");
b3.setToolTipText("Click this button to enable the middle button.");
add(b1);
add(b2);
add(b3);
}
public void actionPerformed(ActionEvent e) {
if ("disable".equals(e.getActionCommand())) {
b2.setEnabled(false);
b1.setEnabled(false);
b3.setEnabled(true);
} else {
b2.setEnabled(true);
b1.setEnabled(true);
b3.setEnabled(false);
}
javax.swing.JOptionPane.showMessageDialog(null,"dialog");
}
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = ButtonDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("ButtonDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ButtonDemo newContentPane = new ButtonDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
我只想在点击b2的时候弹出dialog 但现在是点击每一个按钮都会弹出窗口 请问该如何改才能实现?