所以我不能同时使用两把钥匙，我希望这能发生。
我的代码在这里：
https://pastebin.com/dqcs9dvi
如果您尝试同时移动它们，则只有一个会移动，或者没有一个会移动。我认为这与这里的代码有关：

public KeyBidings(){
        Action upAction = new AbstractAction(){
            public void actionPerformed(ActionEvent e) {
                y2 -=10;
            }
        };
    Action downAction = new AbstractAction(){
        public void actionPerformed(ActionEvent e) {
        y2 +=10;
        }

    };
        Action wAction = new AbstractAction(){
            public void actionPerformed(ActionEvent e) {
                y -=10;
            }
        };
    Action sAction = new AbstractAction(){
        public void actionPerformed(ActionEvent e) {
        y +=10;
        }

    };
    drawPanel.repaint();
            InputMap inputMap = drawPanel.getInputMap(JPanel.WHEN_IN_FOCUSED_WINDOW);
            ActionMap actionMap = drawPanel.getActionMap();

        inputMap.put(KeyStroke.getKeyStroke("DOWN"), "downAction");
        actionMap.put("downAction", downAction);
        inputMap.put(KeyStroke.getKeyStroke("UP"), "upAction");
        actionMap.put("upAction", upAction);

        inputMap.put(KeyStroke.getKeyStroke("S"), "sAction");
        actionMap.put("sAction", sAction);
        inputMap.put(KeyStroke.getKeyStroke("W"), "wAction");
        actionMap.put("wAction", wAction);