Java实力弹弹球实现代码

先看看效果图：

直接上代码了。

微调按钮加画布画几个圆，再实现监听。。。

package cn.hncu.threadDemo.thread2;

import java.awt.Canvas;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.FocusEvent;

import java.awt.event.FocusListener;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JSpinner;

import javax.swing.Timer;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

public class BallsJFrame extends JFrame implements ChangeListener{

private BallsCanvas ball;

private JSpinner spinner;

public BallsJFrame(){

super("弹弹球");

this.setBounds(300, 200, 400, 300);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

Color colors[] = {Color.red,Color.green,Color.blue,Color.magenta,Color.cyan};

ball = new BallsCanvas(colors,100);

this.getContentPane().add(ball);//默认是CENTER位置

JPanel panel = new JPanel();

this.getContentPane().add(panel,"South");

panel.add(new JLabel("Delay"));

spinner = new JSpinner();

spinner.setValue(100);

panel.add(spinner);

spinner.addChangeListener(this);

this.setVisible(true);

}

@Override

public void stateChanged(ChangeEvent e) {

int value = Integer.parseInt(""+spinner.getValue());

ball.setDelay(value);

}

public static void main(String[] args) {

new BallsJFrame();

}

}

class BallsCanvas extends Canvas implements ActionListener, FocusListener{

private Ball balls[];//存放所有的球

private Timer timer;//javax.swing.Timer

public BallsCanvas(Color colors[] ,int delay){

this.balls = new Ball[colors.length];

for(int i=0,x=40;i

this.balls[i] = new Ball(x,x,colors[i]);

}

//让当前画布监听 焦点事件

this.addFocusListener(this);

timer = new Timer(delay,this);

timer.start();

}

public void setDelay(int delay){

timer.setDelay(delay);

}

@Override

public void paint(Graphics g) {

for(int i=0;i

g.setColor(balls[i].color);

//让每个球的坐标变化一下---(x坐标)

balls[i].x = balls[i].left ? balls[i].x-10:balls[i].x+10;

//当球碰壁时，更改球的方向

if(balls[i].x<=0||balls[i].x>=this.getWidth()-24){

balls[i].left = !balls[i].left;//切换方向

}

//让每个球的坐标变化一下---(y坐标)

balls[i].y = balls[i].up ? balls[i].y-10:balls[i].y+10;

//当球碰壁时，更改球的方向

if(balls[i].y<=0||balls[i].y>=this.getHeight()-22){

balls[i].up = !balls[i].up;//切换方向

}

g.fillOval(balls[i].x, balls[i].y, 20, 20);

}

}

@Override

public void actionPerformed(ActionEvent e) {

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

repaint();//刷新画布.调用paint(Graphics g)

}

@Override

public void focusGained(FocusEvent e) {

timer.stop();

}

@Override

public void focusLost(FocusEvent e) {

timer.restart();

}

private static class Ball{

int x,y;

boolean up,left;

Color color;

public Ball(int x, int y, Color color) {

this.x = x;

this.y = y;

this.color = color;

up = left = false;

}

}

}

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