JavaFx 按 esc 关闭窗口？

Question

我在我的程序中调用了一个新阶段，我喜欢在按下转义键时关闭它。我这样做了，这给了我一个 NullPointerException:

    scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
        @Override
        public void handle(KeyEvent t) {
            KeyCode key = t.getCode();
            if (key == KeyCode.ESCAPE){
                stage.close();
            }
        }
    });

Answer 1

尝试这个..

  scene.addEventHandler(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>
  () {

        @Override
        public void handle(KeyEvent t) {
          if(t.getCode()==KeyCode.ESCAPE)
          {
              System.out.println("click on escape");
           Stage sb = (Stage)label.getScene().getWindow();//use any one object
           sb.close();
          }
        }
    });