btnlabelaction.java

有大量的java的实例

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class BtnLabelAction extends Applet implements ActionListener
{
	Label prompt;
	Button btn;
	public void init()
		{
			prompt = new Label("你好");
			btn = new Button("操作");
			add(prompt);
			add(btn);
			btn.addActionListener(this);
		}
		public void actionPerformed(ActionEvent e)
		{
			if(e.getSource()==btn)
				if(prompt.getText()=="你好")
					prompt.setText("再见");
				else
					prompt.setText("你好");
		}
}