仿金山打字通游戏 Java代码

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

public class ZiMu extends JFrame {
ZiMu(){
  this.setSize(300 , 600) ;
  this.setResizable(false) ;
  this.setTitle("打字游戏") ;
  this.setBackground(Color.BLACK) ;

  MyPanel mp = new MyPanel() ;
  this.add(mp) ;
  this.addKeyListener(mp) ;

  Thread t = new Thread (mp) ;
  t.start() ;
 }

 public static void main(String args[]){
  ZiMu w = new ZiMu () ;
  w.setVisible(true) ;

 }
}
class MyPanel extends JPanel implements Runnable, KeyListener {
 int x[] = new int[10] ;
 int y[] = new int[10] ;
 int sum = 0 ;
 String z[] = new String[10] ;

 MyPanel(){
  for(int i=0;i<10;i++){
   x[i] = (int)(Math.random()*300) ;
   y[i] = (int)(Math.random()*300) ;
   z[i] = new String(""+(char)(Math.random()*25+65)) ;
  }
 }
 public void paint(Graphics g) {
  super.paint(g) ;

  this.setBackground(Color.black) ;
  g.setColor(Color.WHITE) ;
  g.drawString("一分钟正确打对的字母： "+sum , 10 , 560) ;
  for(int i=0;i<10;i++){
   g.drawString(z[i] , x[i] , y[i]) ;
  }
 }
 public void run(){
  long g = System.currentTimeMillis() ;

  while(System.currentTimeMillis()-g<=60000) {


   for(int i=0;i<10;i++){
    y[i] ++ ;
    if(y[i]>= 600){
     sum -= 1 ;
     y[i] = (int)(Math.random()*50) ;
     x[i] = (int)(Math.random()*280) ;
     z[i] = new String(""+(char)(Math.random()*25+65)) ;
    }
   }
   try{
    Thread.sleep(20) ;
   }
   catch(Exception e){
   }
   this.repaint() ;
  }

 }
 public void keyTyped(KeyEvent e) {
  // TODO: Add your code here
 }

 public void keyPressed(KeyEvent e) {
  String keychar = new String(""+e.getKeyChar()) ;
  int yy = 0 ;
  int j = -1 ;

  for(int i=0;i<10;i++){
   if(keychar.equals(z[i])){
    if(yy
     yy = y[i] ;
     j = i ;
    }
   }
  }
  if(j!=-1){
   z[j] = new String(""+(char)(Math.random()*25+65)) ;
   y[j] = 0 ;

   sum += 1 ;

  }else{
   sum -= 1 ;
  }
 }
 public void keyReleased(KeyEvent e) {
  // TODO: Add your code here
 }
}