康威的生命遊戲（構造和更新遊戲）

Question

我已經被賦予處理康威生命遊戲的任務。

我遇到了我的CellGrid方法和simulateStep方法的問題。活着的可能性似乎並沒有起作用，並且在simulateStep中，我得到了NullPointerException錯誤。

這裏是我的代碼：

public class CellGrid 
{ 
    private Cell[][] cells; 


/** 
* This populates the grid with cells that will be 
* either living or dead (with this probability given by lifeChance) 
* 
* @param size - grid size 
* @param lifeChance - probability of each cell starting out alive 
*/ 
public CellGrid(int size, double lifeChance) 
{ 
    cells = new Cell[size][size]; 
    Random r = new Random(); 

    for (int i = 0; i < cells.length; i++) 
    { 
     for (int j = 0; j < cells.length; j++) 
     { 
      Cell c = new Cell(); 
      double nextVal = r.nextDouble(); 
      if (nextVal < lifeChance) 
      { 
       c.setAlive(false); 
      } 
      else 
      { 
       c.setAlive(true); 
      } 
     } 
    } 
} 

/** 
* Iterates the simulation by one step (according to Game of Life rules) 
*/ 
public void simulateStep() 
{ 
    for (int y = 0; y < cells.length; y++) 
    { 
     for (int x = 0; x < cells.length; x++) 
     { 
      boolean living = cells[y][x].isAlive(); 
      int count = countNeighbours(y, x); 
      boolean result = false; 

      if (living && count <= 2) 
      { 
       result = false; 
      } 
      if (living && (count == 3 || count == 4)) 
      { 
       result = true; 
      } 
      if (living && count == 5) 
      { 
       result = false; 
      } 
      if (living == true && count > 5) 
      { 
       result = true; 
      } 
      if (living == false && count > 5) 
      { 
       result = true; 
      } 

      result = cells[y][x].isAlive(); 
     } 
    } 
} 

setAlive方法：

public void setAlive(boolean alive) 
{ 
    if (isAlive()== true) 
    { 
     this.alive = false; 
    } 

    if (isAlive() == false) 
    { 
     this.alive = true; 
    } 
} 

感謝您對您的幫助！

Answer 1

您應該在構造函數中將Cell c = new Cell();更改爲cells[i][j] = new Cell();。