Java开关与用户输入击键

Z时代
2024-01-10
分类：问答

我正在Java中做蛇游戏，需要使用用户击键来控制移动的方向。这可能通过switch声明吗？我最初使用Scanner s = new Scanner(System.in)来允许用户输入'u'，'d'等来移动蛇，但我想用键盘箭头代替。Java开关与用户输入击键

这是我现在所拥有的：

public void controlSnake(){ 
Scanner s = new Scanner(System.in); 
String inputString = s.next(); 
    switch (inputString) { 
    case "u": 
    case "U": 
     snake.changeDirection(Point.NORTH); 
     break; 
    case "d": 
    case "D": 
     snake.changeDirection(Point.SOUTH); 
     break; 
    case "r": 
    case "R": 
     snake.changeDirection(Point.EAST); 
     break; 
    case "l": 
    case "L": 
     snake.changeDirection(Point.WEST); 
     break; 
    } 
}

我要插入这样的事情，但不知道如何：

 map1.put(KeyStroke.getKeyStroke("LEFT"), "moveLeft"); 
    getActionMap().put("moveLeft", new AbstractAction() { 
    private static final long serialVersionUID = 1L; 
    public void actionPerformed(ActionEvent e) { 
    snake.changeDirection(Point.WEST); 
    } 
    });

什么是做到这一点的最好办法？

回答：

我看到你在使用Swing。您可以使用KeyListener接口。像这样的东西。

yourButton.addKeyListener(new KeyListener(){ 
     @Override 
      public void keyPressed(KeyEvent e) { 
       if(e.getKeyCode() == KeyEvent.VK_UP){ 
        snake.changeDirection(Point.NORTH); 
       } 
       if(e.getKeyCode() == KeyEvent.VK_DOWN){ 
        snake.changeDirection(Point.SOUTH); 
       } 
       //Likewise for left and right arrows 
      } 
      @Override 
      public void keyTyped(KeyEvent e) { 
       throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. 
      } 
      @Override 
      public void keyReleased(KeyEvent e) { 
       throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. 
      } 
    });