Java如何检查用户是否按下了按键？

Java如何检查用户是否按下了按键？

在Java中，你不检查是否有键被按下，而不是你听到

KeyEvent

秒。实现目标的正确方法是注册一个

KeyEventDispatcher

，并实现它以维持所需密钥的状态：

import java.awt.KeyEventDispatcher;import java.awt.KeyboardFocusManager;import java.awt.event.KeyEvent;public class IsKeyPressed {    private static volatile boolean wPressed = false;    public static boolean isWPressed() {        synchronized (IsKeyPressed.class) { return wPressed;        }    }    public static void main(String[] args) {        KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(new KeyEventDispatcher() { @Override public boolean dispatchKeyEvent(KeyEvent ke) {     synchronized (IsKeyPressed.class) {         switch (ke.getID()) {         case KeyEvent.KEY_PRESSED:  if (ke.getKeyCode() == KeyEvent.VK_W) {      wPressed = true;  }  break;         case KeyEvent.KEY_RELEASED:  if (ke.getKeyCode() == KeyEvent.VK_W) {      wPressed = false;  }  break;         }         return false;     } }        });    }}

然后，您可以随时使用：

if (IsKeyPressed.isWPressed()) {    // do your thing.}

当然，您可以使用相同的方法来实现

isPressing("<some key>")

键映射及其包裹在状态中的状态

IsKeyPressed

。