用addKeyListener实现键盘事件的响应,为什么没有反应?高手进!
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestKey extends JFrame implements KeyListener{
public TestKey(){
setSize(200,100);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] argv){
TestKey tk = new TestKey();
}
public void keyPressed(KeyEvent e){
}
public void keyReleased(KeyEvent e){
}
public void keyTyped(KeyEvent e){
JOptionPane.showMessageDialog(
null,
"succeed",
"Show",
JOptionPane.INFORMATION_MESSAGE);
}
}