bouncezhuan.java

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import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;

/**
   Shows an animated bouncing ball running in a separate thread
*/
public class Bouncezhuan
{
   public static void main(String[] args)
   {
      BounceFrame frame = new BounceFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.show();
   }
}


class BounceFrame extends JFrame
{

   public BounceFrame()
   {
      setSize(WIDTH, HEIGHT);
      setTitle("BounceThread");

      Container contentPane = getContentPane();

      ButtonPanel buttonPanel = new ButtonPanel();
      contentPane.add(buttonPanel);

   }

   public static final int WIDTH = 450;
   public static final int HEIGHT = 350;
}

class ButtonPanel extends JPanel
{
	public ButtonPanel()
	{

        JButton  star=new JButton("加球");
        add(star);
        //匿名内部类的实现
        star.addActionListener(new ActionListener()
		             {
		                public void actionPerformed(ActionEvent evt)
		                {
                            add();
		                }
		             });

		  JButton  st=new JButton("减球");
          add(st);
          st.addActionListener(new ActionListener()
		             {
		                public void actionPerformed(ActionEvent evt)
		                {
                            delet();
		                }
		             });


	    JButton  sta=new JButton("开始");
        add(sta);
        sta.addActionListener(new ActionListener()
		             {
		                public void actionPerformed(ActionEvent evt)
		                {
                            BallThread thread = new BallThread();
							       thread.start();
		                }
		             });



      JButton end=new JButton("退出");
       add(end);
        end.addActionListener(new ActionListener()
		             {
		                public void actionPerformed(ActionEvent evt)
		                {
                            System.exit(0);

		                }
		             });
           }
           //加球实践
      public int add()
        {     n=n+1;
               return n;
        }
            //减球事件
       public int delet()
		 {     n=n-1;
		        return n;
        }

  public void paintComponent(Graphics g)
   {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      for (int i = 0; i <n; i++)
      {
         g2.fill(new Ellipse2D.Double(300+m*Math.sin((360*i/n+c)*Math.PI/180),
         300+m*Math.cos((360*i/n+c)*Math.PI/180), 15, 15));
         g2.setPaint(new Color((5*i+200)%360,10,(10*i)%360));
         repaint();
      }
   }

             //实现内部类
   private class BallThread extends Thread
   {
       public BallThread(){}

      public void run()
      {
         try
         {
            while(true)
            {
				m=(m+10)%150;
                c=(c+20)%200;
               sleep(200);
               repaint();
            }
         }
         catch (InterruptedException exception)
         {
         }
      }

 }

private int m;//run（）方法调用时，球的半径的直。
private int n;//小球的个数
private int c;//run（）方法调用时，球的旋转角度。

}