<img src="http://img.blog.csdn.net/20150625104525974?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMzkxMDM1Nw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
public class ChatApplet extends Applet implements MouseListener,Runnable
{ int x,y;  int top,point;
/***對小程序進行變量和顏色的初始化。
 
*/ 
public void init()  {    x = 0;    y = 0;   
//設置背景色為黑色
setBackground(Color.black); 
addMouseListener(this);
} public void paint(Graphics g)  {    } 
/** *使該程序能夠作為應用程序執行。 */
public static void main(String args[]) 
{    ChatApplet applet = new ChatApplet(); 
JFrame frame = new JFrame("TextAreaNew");  
frame.addWindowListener(new WindowAdapter()
{     
	public void windowClosing(WindowEvent e){
		System.exit(0);   
	}    }); 
frame.getContentPane().add(      applet, BorderLayout.CENTER); 
frame.setSize(800,400); 
applet.init(); 
applet.start(); 
frame.setVisible(true); 
}  /***程序主線程。對一個煙花進行繪制。
 
*/ 
public void run() 
{  
	//變量初始化
	Graphics g1; 
	g1 = getGraphics(); 
	int y_move,y_click,x_click; 
	int v; 
	x_click = x; 
	y_click = y; 
	y_move = 400;
	v = 3;  int r,g,b;
	while(y_move > y_click) 
	{    
		g1.setColor(Color.black);
		g1.fillOval(x_click,y_move,5,5); 
		y_move -= 5;   
		r = (((int)Math.round(Math.random()*4321))%200)+55;   
		g = (((int)Math.round(Math.random()*4321))%200)+55;  
		b = (((int)Math.round(Math.random()*4321))%200)+55;  
		g1.setColor(new Color(r,g,b));
		g1.fillOval(x_click,y_move,5,5);  
		for(int j = 0 ;j<=10;j++)  
		{    
			if(r>55) r -= 20;   
			if(g>55) g -= 20; 
			if(b>55) b -=20;  
			g1.setColor(new Color(r,g,b)); 
			g1.fillOval(x_click,y_move+j*5,5,5);  
		}   
		g1.setColor(Color.black);  
		g1.fillOval(x_click,y_move+5*10,5,5);  
		try     {        Thread.currentThread().sleep(v++); 
		} 
		catch (InterruptedException e) {}  
	}    
	for(int j=12;j>=0;j--)  
	{   
		g1.setColor(Color.black); 
		g1.fillOval(x_click,y_move+(j*5),5,5);
		try     {    
			Thread.currentThread().sleep((v++)/3); 
		} 
		catch (InterruptedException e) {}  }
	y_move = 400;  g1.setColor(Color.black);
	while(y_move > y_click) 
	{     g1.fillOval(x_click-2,y_move,9,5); 
	y_move -= 5; 
	}    v = 15;
	for(int i=0;i<=25;i++)  {   r = (((int)Math.round(Math.random()*4321))%200)+55; 
	g = (((int)Math.round(Math.random()*4321))%200)+55; 
	b = (((int)Math.round(Math.random()*4321))%200)+55;  
	g1.setColor(new Color(r,g,b)); 
	g1.drawOval(x_click-3*i,y_click-3*i,6*i,6*i);
	if(i<23)  
	{    g1.drawOval(x_click-3*(i+1),y_click-3*(i+1),6*(i+1),6*(i+1));  
	g1.drawOval(x_click-3*(i+2),y_click-3*(i+2),6*(i+2),6*(i+2)); 
	}  
	try  
	{        Thread.currentThread().sleep(v++);   
	} catch (InterruptedException e) {}  
	g1.setColor(Color.black);
	g1.drawOval(x_click-3*i,y_click-3*i,6*i,6*i);  
	}} 
/***對鼠標事件進行監聽。
 
*臨聽其鼠標按下事件。
*當按下鼠標時，產生一個新線程。*/ 
public void mousePressed(MouseEvent e)  
{  
	x = e.getX(); 
	y = e.getY();   
	Thread one;  
	one = new Thread(this);  
	one.start();   one = null; 
} 
/**   *實現MouseListener接中的方法。為一個空方法。
  */ 
public void mouseReleased(MouseEvent e)  {  

}  
/**  *實現MouseListener接中的方法。
為一個空方法。  */ 
public void mouseEntered(MouseEvent e)  {  } 
/**   *實現MouseListener接中的方法。為一個空方法。
  */ 
public void mouseExited(MouseEvent e)  {  } 
/**   *實現MouseListener接中的方法。為一個空方法。  */ 
public void mouseClicked(MouseEvent e)  {  } 

}

一個美麗的java煙花程序