java - 你如何实例化一个调用自身的另一个实例化的类？

Question

我正在尝试编写一个 rubiks 立方体代码，我希望立方体的每个面都有六个面类。在类中，我需要访问其所有四个面的面，以便正确移动立方体，因此我尝试在 Face 的构造函数中使用其他四个 Face 对象。我想知道这个实例化是否可行。这是我的做法(第一段代码在主类中，第二段代码来自 Face 类):

white = new Face(red, blue, green, orange, Color.WHITE);
yellow = new Face(orange, blue, green, red, Color.YELLOW);
red = new Face(yellow, blue, green, white, Color.RED);
orange = new Face(white, blue, green, yellow, Color.ORANGE);
blue = new Face(red, yellow, white, orange, Color.BLUE);
green = new Face(red, white, yellow, orange, Color.GREEN);
front = yellow;



public Face top, left, right, bottom;
public Cell[][] cells;

public Face(Face t, Face l, Face r, Face b, Color c) {
    top = t;
    left = l;
    right = r;
    bottom = b;
    cells = new Cell[3][3];
    for(int row = 0; row < 3; row++) {
        for(int col = 0; col < 3; col++) {
            cells[row][col] = new Cell(c);
        }
    }
}

Answer 1

您可以先初始化没有相邻面孔的 Face。然后，在所有这些都初始化之后，您可以通过 setter 定义它们之间的关系。

class Face {
  Face white = new Face(Color.WHITE);
  Face yellow = new Face(Color.YELLOW);

  {
    white.setRight(yellow);
    yellow.setLeft(white);
  }


  public Face top, left, right, bottom;
  public Cell[][] cells;

  public Face(Color c) {
    // only cells init
  }

  public void setLeft(Face left) {
    this.left = left;
  }

  public void setRight(Face right) {
    this.right = right;
  }

}