试试按下方向键。。

import java.awt.*;
import java.awt.event.*;
import java.util.*;
 
 
class Test{
	public static void main(String[] args){
		new MyFrame("Drawing...");
	}	
}
 
class MyFrame extends Frame{
	int x=300;
	int y=300;
	int w=400;
	int h=300;
	private int num=0;
	MyFrame(String s){
		super(s);
		setBounds(x,y,w,h);
		setResizable(false);
		addKeyListener(new KeyAdapter(){
			public void keyPressed(KeyEvent e){
					switch(e.getKeyCode()){
						case KeyEvent.VK_UP:
							y-=50;
							break;
						case KeyEvent.VK_DOWN:
							y+=50;
							break;
						case KeyEvent.VK_LEFT:
							x-=50;
							break;
						case KeyEvent.VK_RIGHT:
							x+=50;
							break;		
					}
					setBounds(x,y,w,h);
			}
		});
		setVisible(true);
		this.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				setVisible(false);
				System.exit(0);	
			}
		});
	}
}