如题,请大家帮我看下以下程序:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class keytest extends JFrame{
public keytest(){
mypanel f=new mypanel();
getContentPane().add(f);
setSize(300,300);
show();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String a[]){
new keytest();
}
}
class mypanel extends JPanel{
mypanel(){
addKeyListener(new KeyAdapter(){
public void keyTyped(KeyEvent e){
char c=e.getKeyChar();
if(c=='o') System.out.print("o is pressed");
}
});
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class keytest extends JFrame{
public keytest(){
mypanel f=new mypanel();
getContentPane().add(f);
setSize(300,300);
show();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String a[]){
new keytest();
}
}
class mypanel extends JPanel{
mypanel(){
addKeyListener(new KeyAdapter(){
public void keyTyped(KeyEvent e){
char c=e.getKeyChar();
if(c=='o') System.out.print("o is pressed");
}
});
}
}
import java.awt.event.*;
import javax.swing.*; class keytest extends JFrame{
public keytest(){
mypanel f=new mypanel();
getContentPane().add(f);
setSize(300,300);
show();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String a[]){
new keytest();
}
}
class mypanel extends JPanel{
mypanel(){
setFocusable(true);//加了一句;
addKeyListener(new KeyAdapter(){
public void keyTyped(KeyEvent e){
char c=e.getKeyChar();
if(c=='o') System.out.print("o is pressed");
}
});
}
}
focusable - 表明此 Component 是否可以获得焦点
自己参考一下..............