JLabel随键盘上下左右移动

zjasd18asd 2010-06-02 09:11:24

窗口中显示字符串“java程序设计”，按下键盘上的箭头键，可按照箭头方向移动（提示：得到键盘键代码的方法是e.getKeyCode()，上、下、左、右键的编码分别用常量VK_UP 、VK_DOWN 、VK_LEFT 、VK_RIGHT表示

刚学java 这个都不懂。。！求答案啊，万分感谢

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zjasd18asd 2010-06-02

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能动了。。最开始的JLabel 我设置了半天都在上面。。怎么不居中。

chosen0ne 2010-06-02

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import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.util.Random;

import javax.swing.*;





public class Test extends JFrame implements KeyListener{



	JLabel jb;

	JPanel jp;

	int x=200,y=200;

	int increment=10;

	public static void main(String[] args) {

		// TODO Auto-generated method stub   

		Test ts=new Test();

    }

	public Test()

	{



		jb=new JLabel("java 程序设计");

		//jb.addActionListener(this);

		jp=new JPanel();

		jb.setLocation(x, y);

		jp.add(jb);

		this.add(jp);

		this.setSize(500,500);

		this.setVisible(true);

		this.addKeyListener(this);//没有添加事件监听器

	}



	@Override

	public void keyPressed(KeyEvent e) {



		// TODO Auto-generated method stub

		switch(e.getKeyCode())  

		{   

			case KeyEvent.VK_LEFT:  

				x-=increment;//这里要同时更改标签的横纵坐标

				break ;  

			case KeyEvent.VK_RIGHT:  

				x+=increment;

				break ;  



			case KeyEvent.VK_UP:  

				y-=increment;

				break;  



			case KeyEvent.VK_DOWN:  

				y+=increment;

				break;  

		}

		jb.setLocation(x,y);

	}

	@Override

	public void keyReleased(KeyEvent e) {

		// TODO Auto-generated method stub

	}

	@Override

	public void keyTyped(KeyEvent e) {

		// TODO Auto-generated method stub

	}

}

注意要为事件源添加监听器，否则不会监听该事件。这里是JPanel

zjasd18asd 2010-06-02

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package NIITwork;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;
import javax.swing.*;

public class test extends JFrame implements KeyListener{

/**
*
*/

JLabel jb;
JPanel jp;
int x=50,y=30;
public static void main(String[] args) {
// TODO Auto-generated method stub
test ts=new test();

}
public test()
{

jb=new JLabel("java 程序设计");
//jb.addActionListener(this);
jp=new JPanel();
jp.add(jb);
jb.setLocation(x, y);
this.add(jp);
this.setSize(500,300);
this.setVisible(true);
}

@Override
public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub
switch(e.getKeyCode())
{
case KeyEvent.VK_LEFT:
jb.setLocation(x, y);
break ;
case KeyEvent.VK_RIGHT:
jb.setLocation(x, y);
break ;

case KeyEvent.VK_UP:
setLocation(x, y);
break;

case KeyEvent.VK_DOWN:
setLocation(x, y) ;
break;
}

}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub

}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub

}

}
我的代码在这，可是动不了