awt-事件处理的实现

/*一个事件监听器可以同时监听无数个组件
 * 一个组件可以同时被好多个不同的监听器监听
 * 
 * */

package awt2yue27;


import java.awt.*;
import java.awt.event.*;
public class MultiListener {
	private Frame f = new Frame("测试");
	private Button b1  = new Button("按钮1");
	private Button b2 = new Button("按钮2");
	private TextArea ta = new TextArea(5,20);
	
	public void init()
	{
		f.add(ta,BorderLayout.SOUTH);
		f.add(b1,BorderLayout.WEST);
		f.add(b2,BorderLayout.EAST);
		f.pack();
		f.setVisible(true);
		b1.addActionListener(new FirstListener());
		b2.addActionListener(new FirstListener());
		b2.addActionListener(new SecondListener());
		
		
		
	}
	//事件监听器1
	class FirstListener implements ActionListener
	{
		 public void actionPerformed (ActionEvent e)
		 {
			  ta.append("第一个事件监听器触发"+"事件源是"+e.getActionCommand());
		 }
		 
	}
	//事件监听器2
	class SecondListener implements ActionListener
	{
		 public void actionPerformed (ActionEvent e)
		 {
			  ta.append("第二个事件监听器触发"+"事件源是"+e.getActionCommand());
		 }
	}
	public static void main(String[] args)
	{
		 new MultiListener().init();
	}

}