JavaEvent/BallRolling.java at master · goder/JavaEvent · GitHub

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* 功能：事件示例，通过键盘上下左右控制小球移动

package com.bj.event;

import java.awt.*;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import javax.swing.*;

public class BallRolling extends JFrame{

MyPanel mp=null;

public static void main(String[] args) {

// TODO Auto-generated method stub

BallRolling br=new BallRolling();

}

public BallRolling(){

mp=new MyPanel();

this.add(mp);

this.addKeyListener(mp);

this.setSize(200,200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

//定义自己面板

class MyPanel extends JPanel implements KeyListener{

int x=10;

int y=10;

public void paint (Graphics g){

super.paint(g);

g.fillOval(x, y, 20, 20);

}

//具体按下某一个键

@Override

public void keyTyped(KeyEvent e) {

// TODO Auto-generated method stub

System.out.println("KeyType");

}

//键按下

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

//System.out.println("KeyPressed"+(char)e.getKeyCode());

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

//System.out.println("12");

this.y+=10;

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

this.y-=10;

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

this.x-=10;

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

this.x+=10;

}

//调用重绘函数repaint

this.repaint();

}

//键松开

@Override

public void keyReleased(KeyEvent e) {

// TODO Auto-generated method stub

System.out.println("KeyReleased");

}

JavaEvent/BallRolling.java at master · goder/JavaEvent · GitHub

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