import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TestButtonEvent{
	public static void main(String args[]){
		JFrame f = new JFrame("事件委托模型");
		JButton b = new JButton("Press Me!");
		b.addActionListener(new ButtonHandler()); 
		f.setLayout(new FlowLayout()); 
		f.add(b);
		f.setSize(200,100);
		f.setVisible(true);
	}
}

class ButtonHandler implements ActionListener{
	public void actionPerformed(ActionEvent e){
		System.out.println("Action occurred");
	}
}