俄罗斯方块（java编写）

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


public class Els extends JFrame implements KeyListener,Runnable 
{ 

public Els() 
{ 
setSize(240,320); 
setUndecorated(true); 
int H=(int) (this.getToolkit().getScreenSize().height); 
int W=(int) (this.getToolkit().getScreenSize().width); 
setLocation(W/2-120,H/2-160); 
setResizable(false); 
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 


} 
public void paint(Graphics g) 
{ 
super.paint(g); 
Graphics2D g2=(Graphics2D)g; 
 g2.setColor(Color.darkGray.brighter().brighter()); 
  
 //绘制小框格 
  for(int m=192;m<=232;m+=10) 
{ 

g2.drawLine(m, 52, m,92); 
} 
for(int m=52;m<=92;m+=10) 
{ 
g2.drawLine(192, m, 232, m); 
} 

 //绘制大框格 
for(int m=0;m<=180;m+=15) 
{ 
g2.drawLine(m, 0, m, 300); 
} 
for(int m=0;m<=300;m+=15) 
{ 
g2.drawLine(0, m, 180, m); 
} 

//将值不非0的格子涂黑 
for(int i=1;i<13;i++) 
{ 
for(int j=0;j<20;j++) 
{ 
g2.setColor(Color.DARK_GRAY); 
if (o[i][j]!=0) g2.fillRect(15*i-13, 15*j+2, 13, 13); 
} 
}