testmultiobjectlistener.java

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//多个组件使用相同的监听器
import java.awt.*;
import java.awt.event.*;

public class TestMultiObjectListener
{
	public static void main(String[]args)
	{
		Frame f = new Frame("test");
		Button b1 = new Button("Start");
		TextField b2 = new TextField("text");
		
		Monitor3 bh = new Monitor3();
		b1.addActionListener(bh);
		b2.addActionListener(bh);
		f.add(b1,"North");
		f.add(b2,"Center");
		f.pack();
		f.setVisible(true);
		
	}
}

class Monitor3 implements ActionListener
{
	public void actionPerformed(ActionEvent e)
	{
		System.out.println("a button "+e.getSource()+" has been  pressed."
		    +"command is :"+ e.getActionCommand());
	}
}