添加的KeyEvent的NumLock键键盘上的按键在JFrame中

Question

我创建的JFrame和一些矩形它使用g.fillRect中，例如：

Rectangle rec1 = new Rectangle(0, 10, 50, 50); 
    g.fillRect((int) rec1.getX(), (int) rec1.getY(), (int) rec1.getWidth(), 
      (int) rec1.getHeight()); 

现在我想知道当有人按下几个数字锁定的钥匙，我已经使用这个代码的尝试：

public void keyPressed(KeyEvent e) { 
    if (e.getKeyCode() == KeyEvent.VK_UP) { 
     y = y - 50; 
    } 

这个代码不工作，我不知道为什么，我需要的KeyListener每个numlock密钥1-9 .. 我该怎么办？ THX

全码：

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Rectangle; 
import java.awt.event.KeyEvent; 
import java.util.Timer; 
import java.util.TimerTask; 

import javax.swing.JComponent; 
import javax.swing.JFrame; 
import javax.swing.JOptionPane; 

public class Game extends JComponent { 
    private static int y = 0; 

    public static void main(String args[]) { 
     JFrame mainFrame = new JFrame("BlueTAP Game"); 
     mainFrame.getContentPane().add(new Game()); 
     mainFrame.setSize(205, 225); 
     mainFrame.setVisible(true); 
     mainFrame.setFocusable(true); 
     final JFrame parent = new JFrame(); 
     JOptionPane 
       .showMessageDialog(
         parent, 
         "Shown only one time! - In this game, the buttons are arranged as the keyboard numpad buttons. you are supposed to click on the right keyboard button place by the grey button place.", 
         "Game Instructions", JOptionPane.PLAIN_MESSAGE); 
     final Timer timer = new Timer(); 
     timer.scheduleAtFixedRate(new TimerTask() { 
      public void run() { 
       System.out.println("H" + y); 
      } 
     }, 0, 1000); 
    } 

    public void paint(Graphics g) { 

     Rectangle rec1 = new Rectangle(10, 10, 50, 50); 
     g.fillRect((int) rec1.getX(), (int) rec1.getY(), (int) rec1.getWidth(), 
       (int) rec1.getHeight()); 
     Rectangle rec2 = new Rectangle(70, 10, 50, 50); 
     g.fillRect((int) rec2.getX(), (int) rec2.getY(), (int) rec2.getWidth(), 
       (int) rec2.getHeight()); 
     Rectangle rec3 = new Rectangle(130, 10, 50, 50); 
     g.fillRect((int) rec3.getX(), (int) rec3.getY(), (int) rec3.getWidth(), 
       (int) rec3.getHeight()); 
     Rectangle rec4 = new Rectangle(10, 70, 50, 50); 
     g.fillRect((int) rec4.getX(), (int) rec4.getY(), (int) rec4.getWidth(), 
       (int) rec4.getHeight()); 
     Rectangle rec5 = new Rectangle(70, 70, 50, 50); 
     g.fillRect((int) rec5.getX(), (int) rec5.getY(), (int) rec5.getWidth(), 
       (int) rec5.getHeight()); 
     Rectangle rec6 = new Rectangle(130, 70, 50, 50); 
     g.fillRect((int) rec6.getX(), (int) rec6.getY(), (int) rec6.getWidth(), 
       (int) rec6.getHeight()); 
     Rectangle rec7 = new Rectangle(10, 130, 50, 50); 
     g.fillRect((int) rec7.getX(), (int) rec7.getY(), (int) rec7.getWidth(), 
       (int) rec7.getHeight()); 
     Rectangle rec8 = new Rectangle(70, 130, 50, 50); 
     g.fillRect((int) rec8.getX(), (int) rec8.getY(), (int) rec8.getWidth(), 
       (int) rec8.getHeight()); 
     g.setColor(Color.LIGHT_GRAY); 
     Rectangle rec9 = new Rectangle(130, 130, 50, 50); 
     g.fillRect((int) rec9.getX(), (int) rec9.getY(), (int) rec9.getWidth(), 
       (int) rec9.getHeight()); 
    } 

    public void keyPressed(KeyEvent e) { 
     if (e.getKeyCode() == KeyEvent.VK_NUMPAD0) { 
      y = y - 50; 
     } 
    } 
} 

Answer 1

您需要使用数字键盘键值：

VK_NUMPAD0 
VK_NUMPAD1 
VK_NUMPAD2 

...

VK_NUMPAD9