Java 使用键事件调用函数

我对按键事件不太熟悉，我正试图弄清楚当按下空格键时如何调用函数。我包含了一些伪代码，用于我正在尝试做的事情

public类实现KeyListener{
跳转（）{
///////////
///代码////
///////////
}
@凌驾
按下公共无效键（按键事件e）{
if（e==空格）{
跳转（）
}
}
@凌驾
公共无效密钥已释放（密钥事件e）{
//TODO自动生成的方法存根
}
@凌驾
public void keyTyped（KeyEvent e）{
//TODO自动生成的方法存根
}
}

您可以编写密钥侦听器：

public class KeyEventDemo ...  implements KeyListener ... {
...//where initialization occurs:
    typingArea = new JTextField(20);
    typingArea.addKeyListener(this);

    //Uncomment this if you wish to turn off focus
    //traversal.  The focus subsystem consumes
    //focus traversal keys, such as Tab and Shift Tab.
    //If you uncomment the following line of code, this
    //disables focus traversal and the Tab events 
    //become available to the key event listener.
    //typingArea.setFocusTraversalKeysEnabled(false);
...
/** Handle the key typed event from the text field. */
public void keyTyped(KeyEvent e) {
    displayInfo(e, "KEY TYPED: ");
}

/** Handle the key-pressed event from the text field. */
public void keyPressed(KeyEvent e) {
    displayInfo(e, "KEY PRESSED: ");
}

/** Handle the key-released event from the text field. */
public void keyReleased(KeyEvent e) {
    displayInfo(e, "KEY RELEASED: ");
}
...
private void displayInfo(KeyEvent e, String keyStatus){

    //You should only rely on the key char if the event
    //is a key typed event.
    int id = e.getID();
    String keyString;
    if (id == KeyEvent.KEY_TYPED) {
        char c = e.getKeyChar();
        keyString = "key character = '" + c + "'";
    } else {
        int keyCode = e.getKeyCode();
        keyString = "key code = " + keyCode
                + " ("
                + KeyEvent.getKeyText(keyCode)
                + ")";
    }

    int modifiersEx = e.getModifiersEx();
    String modString = "extended modifiers = " + modifiersEx;
    String tmpString = KeyEvent.getModifiersExText(modifiersEx);
    if (tmpString.length() > 0) {
        modString += " (" + tmpString + ")";
    } else {
        modString += " (no extended modifiers)";
    }

    String actionString = "action key? ";
    if (e.isActionKey()) {
        actionString += "YES";
    } else {
        actionString += "NO";
    }

    String locationString = "key location: ";
    int location = e.getKeyLocation();
    if (location == KeyEvent.KEY_LOCATION_STANDARD) {
        locationString += "standard";
    } else if (location == KeyEvent.KEY_LOCATION_LEFT) {
        locationString += "left";
    } else if (location == KeyEvent.KEY_LOCATION_RIGHT) {
        locationString += "right";
    } else if (location == KeyEvent.KEY_LOCATION_NUMPAD) {
        locationString += "numpad";
    } else { // (location == KeyEvent.KEY_LOCATION_UNKNOWN)
        locationString += "unknown";
    }

    ...//Display information about the KeyEvent...
  }
}

---

我发现这可能对您有所帮助

键盘上的每个键都有唯一的键代码。因此，您可以检查是否按下了键，如果它等于

32

（空格键的键代码），您可以调用该方法

像这样：

@Override
public void keyPressed(KeyEvent e) {
    if(e.getKeyCode() == 32){
        jump();
    }
}
public void jump(){
    System.out.println("Jump");
}

或者您可以从

VK\u空间
中进行检查：

if(e.getKeyCode() == KeyEvent.VK_SPACE){
    jump();
}

然后，您可以向按钮添加操作，如：

scrap s = new scrap();
buttonVar.addKeyListener(s);

可能重复的