程序编译没错就是运行后没有反应.实在是不知道该怎么做了.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class test extends JFrame{
JPanel pl;
public test()
{
pl=new JPanel();
this.setLayout(null);
pl.setBounds(50,50,60,60);
pl.setBackground(Color.red);
this.getContentPane().add(pl);
this.setTitle("练习");

this.addKeyListener(new KeyAdapter()
{
public void pl_keyPressed(KeyEvent e){
if(e.getKeyCode()==39){
System.out.println("213");
pl.setLocation(pl.getLocation().x,pl.getLocation().y+10);
}
}
});
}
public static void main(String arg[]){
test ts=new test();
ts.setBounds(200,100,300,300);
ts.show();
}
}

[此贴子已经被作者于2007-7-19 22:00:13编辑过]

[此贴子已经被作者于2007-7-20 12:17:53编辑过]

改过了以后,还是会出现错误!我也是一位Java的初学者,请高手指教!
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class test extends JFrame{
JPanel pl;
public test()
{
pl=new JPanel();
this.setLayout(null);
pl.setBounds(50,50,60,60);
pl.setBackground(Color.red);
this.getContentPane().add(pl);
this.setTitle("ϰ");

this.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent e){
if(e.getKeyCode()==39){
System.out.println("213");
pl.setLocation(pl.getLocation().x,pl.getLocation().y+10);
}
}
});
}
public static void main(String arg[]){
test ts=new test();
ts.setBounds(200,100,300,300);
ts.setVisible(true);
}
}
会出现以下错误:错误在附件中!

jeuM6jHI.rar (9.36 KB) [求助]KeyAdapter类问题(在线等)

[此贴子已经被作者于2007-7-24 20:00:16编辑过]