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/*

* 加深对事件处理机制的理解

* 1.通过上下左右键，来控制一个先求的位置

*

*/

package Class2;

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Demo2 extends JFrame {

MyPanel mp=null;

public static void main(String[] args)

{

Demo2 d=new Demo2();

}

//构造

public Demo2()

{

mp=new MyPanel();

//mp加入到JFrame

this.add(mp);

this.addKeyListener(mp);

this.setSize(400,300);

this.setVisible(true);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

//定义自己的面板,也是监听者

class MyPanel extends JPanel implements KeyListener

{

int x=10;

int y=10;

public void paint(Graphics g)

{

super.paint(g);

g.fillOval(x, y, 15, 15);

}

//键被按下

public void keyPressed(KeyEvent e) {

// TODO 自动生成的方法存根

//System.out.println("被按下"+e.getKeyCode());

if(e.getKeyCode()==KeyEvent.VK_DOWN)

{

y+=10;

}else if(e.getKeyCode()==KeyEvent.VK_UP)

{

y-=10;

}else if(e.getKeyCode()==KeyEvent.VK_LEFT)

{

x-=10;

}else if(e.getKeyCode()==KeyEvent.VK_RIGHT)

{

x+=10;

}

//调用repaint();

this.repaint();

}

//键被释放

public void keyReleased(KeyEvent e) {

// TODO 自动生成的方法存根

}

//键的一个值被输出

public void keyTyped(KeyEvent e) {

// TODO 自动生成的方法存根

}

}