下大雪

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import java.awt.*;

public class MySnow{

public static void main(String[] args){

Frame w = new Frame();

w.setSize(1024, 768);

w.setBackground(Color.BLACK);

MyPanel mp = new MyPanel();

w.add(mp);

Thread t = new Thread(mp);

t.start();

w.show();

}

}

class MyPanel extends Panel implements Runnable{

int x[] = new int[300];

int y[] = new int[300];

public MyPanel(){

for(int i=0;i<300;i++){

x[i] = (int)(Math.random()*1024);

y[i] = (int)(Math.random()*768);

}

}

public void paint(Graphics g){

g.setColor(Color.WHITE);

for(int i=0;i<300;i++){

g.drawString("*",x[i], y[i]);

}

}

public void run(){

while(true){

try{

for(int i=0; i<300; i++){

y[i]++;

if(y[i]>768){

y[i] = 0;

}

}

Thread.sleep(30);

}catch(Exception e){

}

repaint();

}

}

}