Java實力彈彈球實現代碼_java

先看看效果圖：

直接上代碼了。
微調按鈕加畫布畫幾個圓，再實現監聽。。。

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("彈彈球");    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);//預設是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<colors.length;i++,x+=20){      this.balls[i] = new Ball(x,x,colors[i]);    }    //讓當前畫布監聽 焦時間點事件    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<this.balls.length;i++){      g.setColor(balls[i].color);      //讓每個球的座標變化一下---（x座標）      balls[i].x = balls[i].left ? balls[i].x-10:balls[i].x+10;      //當球碰壁時，更改球的方向      if(balls[i].x<=0||balls[i].x>=this.getWidth()-24){        balls[i].left = !balls[i].left;//切換方向      }      //讓每個球的座標變化一下---（y座標）      balls[i].y = balls[i].up ? balls[i].y-10:balls[i].y+10;      //當球碰壁時，更改球的方向      if(balls[i].y<=0||balls[i].y>=this.getHeight()-22){        balls[i].up = !balls[i].up;//切換方向      }      g.fillOval(balls[i].x, balls[i].y, 20, 20);    }  }  @Override  public void actionPerformed(ActionEvent e) {    //System.out.println("aaa");    repaint();//重新整理畫布.調用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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