一个简单的案件处理程序

package _8;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

public class EventDemo extends JFrame{

JButton button = new JButton("点我!");

public EventDemo() {

setSize(300, 300);

setLocationRelativeTo(null); // 窗口居中显示

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// 匿名内部类实现按钮点击事件

button.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

// 获取触发事件的按钮

JButton clickedButton = (JButton) e.getSource();

// 修改按钮文本

clickedButton.setText("我被点了!");

}

});

setLayout(new FlowLayout());

add(button);

}

public static void main(String[] args) {

EventDemo frame = new EventDemo();

frame.setVisible(true); // 显示窗口

}

}