Java中的事件键箭头

Question

我正在用Java模拟超人飞行。

如何创建一个同时考虑右箭头和左箭头键的事件？

我这样设置每个箭头的事件：

 public void keyPressed(KeyEvent e) 
{
 int KeyCode=e.getKeyCode();

 switch(KeyCode)
 {
     case KeyEvent.VK_LEFT:
         supermanleft.moveLeft();
         break;
     case KeyEvent.VK_RIGHT:
         supermanfly.moveRight();
         break;
     case KeyEvent.VK_UP:
         superman.moveUp();
         break;
     case KeyEvent.VK_DOWN:
         superman.moveDown();
         break;
 }
}

当我同时点击两个箭头时，超人会返回。

Answer 1

当两个键都被按下时，每个键都会调用keyPressed。您可以保持按下一组键，然后查看是否需要按下两个键：

private Set<Character> pressed = new HashSet<Character>();

public synchronized void keyPressed(KeyEvent e) {

    pressed.add(e.getKeyChar());

    if (pressed.size() > 1) {
        //check if pressed contains what you want it to contain
    } else {
       //only one key is pressed - act as normal
    }
}

public synchronized void keyReleased(KeyEvent e) {
    //don't forget to remove when released:
    pressed.remove(e.getKeyChar());
}

希望这会有所帮助。