java事件

package Action;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class JButtonEventEx implements ActionListener {

    JFrame frame;
    JLabel label;
    JButton[] button;
    public JButtonEventEx()
    {
        frame=new JFrame("按钮事件处理");
        frame.setContentPane(createContentPane());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(400,250);
        frame.pack();
        frame.setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e)
    {
        JButton b=(JButton)e.getSource();
        label.setText(b.getText());
    }
    
    public Container createContentPane()
    {
        label=new JLabel("Button ?");
        button =new JButton[3];
        Container contentPane=frame.getContentPane();
        contentPane.setLayout(new FlowLayout(FlowLayout.RIGHT,5,10));
        contentPane.add(label);
        for(int i=0;i<button.length;i++)
        {
            button[i]=new JButton("button"+i);
            button[i].addActionListener(this);
            contentPane.add(button[i]);            
        }
        return contentPane;
    }
    
    public static void main(String[] args) {
        new JButtonEventEx();
    }

}