为什么我们不能在类中覆盖

Question

I am writing a code of game and I am using KeyAdapter class for keyboard Inputs but I am encountring a problem. I am extending and using function of KeyAdapter class as follows

class Kadapter extends KeyAdapter {
  @Override
  public void keyPressed(KeyEvent e) {
    //here i will write required code
  } 
}

When i am writing it outside all class then I am not getting any error in overriding the function key pressed but now suppose if I define it inside any other class as shown here

class Arena extends JPanel {
  Player pl;

  Arena() {
    pl = new Player();
  }

  class Kadapter extends KeyAdapter {
    @Override
    public void KeyPressed(KeyEvent e) {
    }
  }
}

Then I am getting error in overriding the function keyPressed. can anyone tell me why. I wanted to define it inside the arena class because i will require the same instance of player class in Kadapter class. well i could pass that instance through functions. but my question here is that why can't we override the same function inside arena class.I will find any alternate solution about player problem that's not a problem but please tell me about this Override problem. I am very curious about it.

Answer 1

You can define and implement inside the nested class. There should not be any issue.

So far I can see only issue is with method name as KeyPressed .

class Arena extends JPanel {
  Player pl;

  Arena() {
    pl = new Player();
  }

  class Kadapter extends KeyAdapter {
    @Override
    public void KeyPressed(KeyEvent e) {
    }
  }
}

It should be keyPressed

k as lower case!