guidemo8.java

java程序设计语言源代码

//Example 8 of Chapter 5

import  java.awt.*;
import  javax.swing.*;
import  java.awt.event.*;

public  class  GUIDemo8
{
	private  JFrame  f;
	static JTextField  tf;
	
	public  static  void  main(String  args[])
	{
		GUIDemo8  demo = new  GUIDemo8();
		demo.go();
	}
	
	public  void  go()
	{
		f = new  JFrame("三个监听器的实例");
		JPanel container = new JPanel();
		f.setContentPane(container);
		container.setLayout(new BorderLayout());
		
		tf = new  JTextField(30);
		
		container.add(new  JLabel("单击并拖动鼠标") , BorderLayout.NORTH);
		container.add(tf , BorderLayout.SOUTH);
		f.addMouseListener(new RunMouseAdapter());
		f.addMouseMotionListener(new RunMouseMotionAdapter());
		f.addWindowListener(new RunWindowAdapter());
		f.setSize(240 , 200);
		f.setVisible(true);
	}
	
}

class RunMouseAdapter extends MouseAdapter
{
	public  void  mouseEntered(MouseEvent  e)
	{
		String  s = "鼠标进来了";
		GUIDemo8.tf.setText(s);
	}
	
	public  void  mouseExited(MouseEvent  e)
	{
		String  s = "鼠标退出了";
		GUIDemo8.tf.setText(s);
	}
}

class RunMouseMotionAdapter extends MouseMotionAdapter
{
	public  void  mouseDragged(MouseEvent  e)
	{
		String  s = "鼠标拖动 :X="+e.getX()+",Y="+e.getY();
		GUIDemo8.tf.setText(s);
	}
}

class RunWindowAdapter extends WindowAdapter
{
	public  void  windowClosing(WindowEvent  e)
	{
		System.exit(1);
	}
}