1 package zuidaimapack_1;

 import java.awt.*;

 import javax.swing.*;

 /**

  *Java_Swing实现小球沿正弦曲线运动的代码

  * @author Visec·Dana

  */

 public class SinRun extends JFrame implements Runnable {

     private static final long serialVersionUID = 1L;

     static int i = 0;

     static int j = 250;

     static double x = 0;

     static double v = 5;// 速度

     static double w = 2 * Math.PI;

     static double A = 50;// 振幅

     static double t = 0;// 时间

     public SinRun() {

         this.setSize(500, 500);

         this.setVisible(true);

     }

     public void paint(Graphics g) {

         super.paint(g);

         g.setColor(Color.black);

         g.fillOval(i, j + (int) x, 10, 10);

     }

     public void run() {

         while (true) {

             try {

                 Thread.sleep(100);

             } catch (InterruptedException e) {

                 // e.printStackTrace();

             }

             i += v;

             x = A * Math.sin(w * t);

             t += 0.1;

             this.repaint();

             if (i > 500)

                 i = 0;

         }

     }

     public static void main(String args[]) {

         new Thread(new SinRun()).start();

     }

 }