sport.java

用Java实现的跳动的小球

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package ballanim;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Administrator
 */
public class Sport extends Canvas{
    int ballX = 0;
    int ballDirection = 0;
    //int x = BallAnim.MAXIMIZED_HORIZ;
    //int y = BallAnim.MAXIMIZED_VERT;
    Sport(){
        new Thread(new Runnable() {
            public void run() {
             while (true){
                    try {
                         repaint();
                        moveBall();                       
                        Thread.sleep(10);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(Sport.class.getName()).log(Level.SEVERE, null, ex);
                    }
            }
            }
        }).start();
    }
    public void moveBall(){
        if(ballDirection==0){
            ballX++;
            if(ballX>=270){
                ballDirection=1;
                ballX=270;
            }           
        }
        else{
            ballX--;
            if(ballX<=0)
            {
                ballDirection=0;
                ballX=0;
            }
        }
    }
    @Override
     public void paint(Graphics g){
        g.setXORMode(getBackground());
        //g.fillRect(40, 10, 40, 40);
        g.setColor(Color.RED);
        g.fillOval(ballX, 10, 30, 30);
     }
}