键盘事件--按下键盘上的上下左右键会打印出来

电玩女神 2022-05-09 12:00 199阅读 0赞

package GUI;
    /*键盘事件*/
    import java.awt.*;
    import java.awt.event.*;
    
    import javax.swing.*;
    public class TestKey {
    	
    	public static void main(String[] args) {
    		new KeyFrame().launchFrame();
    
    	}
    }
    
    
    class KeyFrame extends Frame {
    	public void launchFrame() {
    		JFrame frame = new JFrame("BorderLayoutDemo");
    	      frame.setBounds(500, 200, 300, 300);
    	      frame.setLayout(new BorderLayout(10, 10));
    	      JButton b1 = new JButton("Up");
    	      frame.add(b1, BorderLayout.NORTH);
    	      b1.addKeyListener(new MyKeyMonitor());
    	      
    	      JButton b2 = new JButton("Right");
    	      frame.add(b2, BorderLayout.EAST);
    	      b2.addKeyListener(new MyKeyMonitor());
    	      
    	      JButton b3 = new JButton("Down");
    	      frame.add(b3, BorderLayout.SOUTH);
    	      b3.addKeyListener(new MyKeyMonitor());
    	      
    	      JButton b4 = new JButton("Left");
    	      frame.add(b4, BorderLayout.WEST);
    	      b4.addKeyListener(new MyKeyMonitor());
    	      
    	      frame.add(new JButton("Centre"));
    	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗口
    	      frame.setVisible(true);		
    	}
    	
    	class MyKeyMonitor extends KeyAdapter {
    		public void keyPressed(KeyEvent e) {
    			int keyCode = e.getKeyCode();
    			if(keyCode == KeyEvent.VK_UP) {
    				System.out.println("上");
    			}
    			if(keyCode == KeyEvent.VK_DOWN) {
    				System.out.println("下");
    			}
    			if(keyCode == KeyEvent.VK_LEFT) {
    				System.out.println("左");
    			}
    			if(keyCode == KeyEvent.VK_RIGHT) {
    				System.out.println("右");
    			}
    		}
    	}
    }

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[70]: /images/20220509/6bb9cd186c1340d4871a01803eba7571.png