在JAVA中怎样判断按下两个键_keyeventargs 双键判断-优快云博客

本文提供了一个使用Java Swing实现的键盘按键监听示例程序。该程序通过监听键盘上的方向键来更新界面上文本框的内容，展示当前按下的是哪个方向键或组合键。此示例适用于初学者了解如何在Java中实现键盘事件的监听与处理。

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import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import javax.swing.JFrame; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ import javax.swing.JPanel; import javax.swing.JTextField; /** * * @author 阿迪 */ public class HOHO extends JFrame implements KeyListener{ private JTextField t; private boolean left = false; private boolean right = false; private boolean up = false; private boolean down = false; public HOHO() { JPanel p = new JPanel(); this.add(p); p.setLayout(null); t = new JTextField(); t.setEditable(false); p.add(t); t.setSize(100,30); t.setLocation(200,200); this.setFocusable(true); this.addKeyListener(this); this.setSize(480,480); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void keyTyped(KeyEvent e) { } public void keyPressed(KeyEvent e) { int i = e.getKeyCode(); switch(i) { case KeyEvent.VK_LEFT : left=true; break; case KeyEvent.VK_UP : up= true;break; case KeyEvent.VK_DOWN :down = true; break; case KeyEvent.VK_RIGHT : right = true;break; } if(up==false&&down==false&&left==false&&right==false) { t.setText("什么也没按"); } else if(up==true&&down==false&&left==false&&right==false) { t.setText("上"); } else if(up==false&&down==true&left==false&&right==false) { t.setText("下"); } else if(up==false&&down==true&left==true&&right==false) { t.setText("左下"); } else if(up==true&&down==false&left==false&&right==true) { t.setText("右上"); } else if(up==true&&down==false&left==true&&right==false) { t.setText("左上"); } else if(up==false&&down==true&left==false&&right==true) { t.setText("右下"); } else if(up==false&&down==false&left==true&&right==false) { t.setText("左"); } else if(up==false&&down==false&left==false&&right==true) { t.setText("右"); } } public void keyReleased(KeyEvent e) { int i = e.getKeyCode(); switch(i) { case KeyEvent.VK_LEFT : left=false; break; case KeyEvent.VK_UP : up= false;break; case KeyEvent.VK_DOWN :down = false; break; case KeyEvent.VK_RIGHT : right = false;break; } } public static void main(String[] args){ new HOHO(); } }