java - 键绑定(bind)问题

Question

我正在创建一个 Pong 克隆，并且正在尝试使用 KeyBindings。这有效:

getInputMap().put(KeyStroke.getKeyStroke("F2"),"leftup");
        getActionMap().put("leftup", new AbstractAction() {
            private static final long serialVersionUID = -7625435800213244316L;

            public void actionPerformed(ActionEvent e) {
                System.out.println("Yay");
            }
        });

但不是这个:

getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_W, Event.ACTION_EVENT),"leftup");
        getActionMap().put("leftup", new AbstractAction() {
            private static final long serialVersionUID = -7625435800213244316L;

            public void actionPerformed(ActionEvent e) {
                System.out.println("Yay");
            }
        });

Answer 1

根据 Java 文档，没有适合 KeyEvent、Event 的 getKeyStroke 重载。

非常确定

getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_W, Event.ACTION_EVENT),"leftup");

应该是

getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_W),"leftup");