import java.awt.*;

import java.applet.*;

import java.awt.event.*;

import javax.swing.*;

public class ThreadDrawJ extends JFrame

{

MovingShape [] shapes;

public void init()

{

setLayout(null);

setSize(426,266);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setVisible(true);

shapes = new MovingShape[ 10 ];

for( int i=0; i<shapes.length; i++ ){

shapes[i] = new MovingShape(this);

shapes[i].start();

}

}

public static void main(String [] args) //¼ÓÈëmain,ʹ֮Äܵ±ApplicationÓ¦ÓÃ

{

ThreadDrawJ f = new ThreadDrawJ();

f.init();

}

}

class MovingShape extends Thread

{

private int size=100;

private int speed=10;

private Color color;

private int type;

private int x,y,w,h,dx,dy;

protected java.awt.Component app;

public boolean stopped;

MovingShape( JFrame app )

{

this.app = app;

x = (int)(Math.random() * app.getSize().width);

y = (int)(Math.random() * app.getSize().height);

w = (int)(Math.random() * size );

h = (int)(Math.random() * size );

dx = (int)(Math.random() * speed );

dy = (int)(Math.random() * speed );

color = new Color (

(int)(Math.random()*128+128),

(int)(Math.random()*128+128),

(int)(Math.random()*128+128) );

type = (int)(Math.random() * 3 );

}

public void run()

{

while( true ){

if( stopped ) break;

//draw();

SwingUtilities.invokeLater( ()->{

draw();

});

try{ Thread.sleep(130); } catch( InterruptedException e ){}

}

}

void draw(){

x += dx;

y += dy;

if( x<0 || x+w>app.getSize().width ) dx = -dx;

if( y<0 || y+h>app.getSize().height) dy = -dy;

Graphics g = app.getGraphics();

switch( type ){

case 0:

g.setColor(color);

g.fillRect( x,y,w,h );

g.setColor( Color.black );

g.drawRect( x,y,w,h );

break;

case 1:

g.setColor(color);

g.fillOval( x,y,w,h );

g.setColor( Color.black );

g.drawOval( x,y,w,h );

break;

case 2:

g.setColor(color);

g.fillRoundRect( x,y,w,h,w/5,h/5);

g.setColor( Color.black );

g.drawRoundRect( x,y,w,h,w/5,h/5 );

break;

}

}

}