java标签的键盘事件

Question

时间一个标签在容器里面随键盘控制移动的问题，代码如下：
import java.awt.*;
import java.net.URL;
import javax.swing.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class mianban extends JFrame{
int countx;
int county;
JLabel jl=new JLabel();
Container c=getContentPane();
private static Thread t;
public mianban(){
Icon tb=new ImageIcon("D:/Program Files/eclipse/workplace/箱子/src/1.gif");
c.setLayout(null);
c.setBackground(Color.white);
setVisible(true);
setSize(300,300);
jl.setIcon(tb);
jl.setBounds(100,50, 30, 30);
jl.setOpaque(true);
jl.setBackground(Color.red);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
t=new Thread(new Runnable(){
   public void run(){
       jl.setBounds(countx,county,30,30);
               jl.addKeyListener(new KeyListener(){
       public void keyPressed(KeyEvent e){
   int keycode=e.getKeyCode();
   if(keycode==KeyEvent.VK_UP){
   county=county+10;
    }
if(keycode==KeyEvent.VK_DOWN){
county=county-10; }
if(keycode==KeyEvent.VK_LEFT){
countx=countx-10;

}
if(keycode==KeyEvent.VK_RIGHT){
countx=countx+10;

} }
public void keyTyped(KeyEvent e){ // 发生击键事件时被触发

} public void keyReleased(KeyEvent e){ // 按键被释放时被触发

}
});
}
});
t.start();
c.add(jl);
}
public static void main(String[] args) {
new mianban(); }}
无论怎么按方向键，标签总是不移动，不知道哪里错了，请高人解答~~~~~

Answer 1

import java.awt.*;
import javax.swing.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class Main extends JFrame{
int countx;
int county;
JLabel jl=new JLabel();
Container c=getContentPane();
private static Thread t;
public Main(){
Icon tb=new ImageIcon("D:/Program Files/eclipse/workplace/箱子/src/1.gif");
c.setLayout(null);
c.setBackground(Color.white);
setVisible(true);
setSize(300,300);
jl.setIcon(tb);
jl.setBounds(100,50, 30, 30);
jl.setOpaque(true);
jl.setBackground(Color.red);
this.addKeyListener(new KeyListener(){
      public void keyPressed(KeyEvent e){
  int keycode=e.getKeyCode();
  if(keycode==KeyEvent.VK_UP){
  setCountY(county-10);
    }
if(keycode==KeyEvent.VK_DOWN){
setCountY(county+10);}
if(keycode==KeyEvent.VK_LEFT){
setCountX(countx-10);}
if(keycode==KeyEvent.VK_RIGHT){
setCountX(countx+10);}}
public void keyTyped(KeyEvent e){ // 发生击键事件时被触发}public void keyReleased(KeyEvent e){ // 按键被释放时被触发}
});
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
c.add(jl);
}public void setCountX(int countx){
   this.countx=countx;
   jl.setLocation(countx, county);
}public void setCountY(int county){
 this.county=county;
 jl.setLocation(countx, county);
}public static void main(String[] args) {
new Main();}}