从子类访问父类对象

Question

我正在创建一个带有GUI的连接四游戏，我一直在重启游戏。我的目标是当用户按下MyBoard JPanel上的重启按钮时，游戏将重启。我正在使用mouseListener，我想从子类MyBoard访问对象面板。

 public class Mediator(){
      public Mediator(){ 
          MyBoard panel = new MyBoard();
          JFrame board = new JFrame("Connect4");
          board.setSize(728, 728);
          board.setLocationRelativeTo(null); 
          board.add(panel);
          board.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          board.setVisible(false);
          board.setFocusable(true);
          board.setResizable(false);
      }
}



public class MyBoard extends JPanel implements MouseListener, MouseMotionListener {
     public MyBoard( ) {}
           @Override
           public void mouseClicked(MouseEvent e) {
               startX = e.getX();
               startY = e.getY();
               //Restart Button
               if (startX > rectButton1.x && startX < rectButton1.x + rectButton1.width && startY > rectButton1.y
                    && startY < rectButton1.y + rectButton1.height) {
            //I'm stuck here  
        }

Answer 1

创建MyBoard时使用对Mediator的引用

public class Mediator(){

    public Mediator(){ 
      MyBoard panel = new MyBoard(this);
      ...


 public class MyBoard extends JPanel implements MouseListener, MouseMotionListener {
        private Mediator mediator;

        public MyBoard(Mediator mediator)  {
              this.mediator = mediator;
        ...

此外，您可能必须将新板的构造移至方法重启，而不是在Mediator构造函数中执行。