import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class keybord extends Applet implements KeyListener{ public void init() {
addKeyListener(this);
}
public void keyPressed(KeyEvent e){
int keycode=e.getKeyCode();
if(keycode==KeyEvent.VK_LEFT){
System.out.print("\n/you pressed left.");
}
}
public void keyReleased(KeyEvent e){
}
public void KeyTyped(KeyEvent e){
char keychar=e.getKeyChar();
switch(keychar){
case 'a':{
System.out.println("\nA was pressed.");
}
}
}
}
//error:The type keybord must implement the inherited abstract method
KeyListener.keyTyped(KeyEvent)
在class keybord上:
The public type keybord must be defined in its own file