如何实现对键盘事件的处理？（有程序）100分

Question

实现KeyListener接口
class Tempt extends Frame implements KeyListener
{
    //
}

Answer 1

程序改为：
import java.awt.*;
import java.awt.event.*;class Tempt extends Frame implements KeyListener
{
Tempt()
{
    addKeyListener(this);
} public void keyPressed(KeyEvent e)
{
System.out.println(e);
}
public void keyReleased(KeyEvent e){System.out.println(e);}
public void keyTyped(KeyEvent e){}
public static void main (String args[])
{
//System.out.println("Hello World!");
//System.out.flush();
System.out.println("Staring....");
Tempt t=new Tempt();
t.setSize(400,400);
t.setVisible(true);
}
}

Answer 2

import java.awt.*;
import java.awt.event.*;    //                               加上这一部分
    public class Tempt extends Frame implements KeyListener
    {
            Tempt()
            {
                addKeyListener(this);
            }
            public void keyPressed(KeyEvent e){
                    System.out.println("e");
            }
            //         这个k要小写。
            public void keyReleased(KeyEvent e){System.out.println("e");}
            public void keyTyped(KeyEvent e){}
            public static void maifn (String args[])
            {
                    //System.out.println("Hello World!");
                    //System.out.flush();
                    System.out.println("Staring....");
                    Tempt t=new Tempt();
                    t.setSize(400,400);
                    t.setVisible(true);
            }
    }

Answer 3

或者在类内部实现该接口
class Tempt extends Frame 
{
Tempt()
{
             addKeyListener(new KeyListener() {
                public void keyPressed(KeyEvent e)
       {
  System.out.println("e");
       }
       public void KeyReleased(KeyEvent e){System.out.println("e");}
       public void KeyTyped(KeyEvent e){}             });
} public static void main (String args[])
{
//System.out.println("Hello World!");
//System.out.flush();
System.out.println("Staring....");
Tempt t=new Tempt();
t.setSize(400,400);
t.setVisible(true);
}
}

Answer 4

如果不在GUI下写键盘的监听，该如何写，能这样写吗？