java - 用随机列表中的 2 个值填充 2D 数组（2048 游戏）

Question

我正在尝试重新创建 2048 游戏，但我撞到了一堵砖墙并被难住了。我用二维数组制作了我的网格，它似乎工作正常。然后我做了一个方法来在这个网格/数组中存储一个空白/可用空间列表，以便可以将两个起始数字分配给两个随机可用空间。我的问题是我无法让数字显示在实际网格中。我在下面有我的代码，如果有人能告诉我我哪里出错了，我将不胜感激。抱歉，如果我对此进行了可怕的解释，我对 Java 还是很陌生。

import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class Main {
    //Game Board Size Method - Getting User Number to use for dimension of game board
    public static int gameBoardSize() {
        int number = 0;
        int row = 0;
        Scanner in = new Scanner(System.in);
        System.out.println("Welcome to 1024");
        System.out.print("Please select a number between 4 & 8 to determine the size of your game board: "); //Prompt user to select number
        number = in.nextInt(); //Storing number in variable
        if (number >= 4 && number <= 8) { //If number is >= 4 and <= 8
            row = number; //Assign number to row variable
        } else {
            System.out.print("Error, please select a number between 4 & 8"); //Error print message
        }
        return row; //Return
    }

    //Display Game board method - Array for game board grid and to display the grid.
    public static void displayGameBoard(int[][] gameBoard, int gameBoardSize) {
        String divider;
        switch (gameBoardSize) {
            case 5:
                divider = "\n+-----+-----+-----+-----+-----+"; //User Number 5
                break;
            case 6:
                divider = "\n+-----+-----+-----+-----+-----+-----+"; //User Number 6
                break;
            case 7:
                divider = "\n+-----+-----+-----+-----+-----+-----+-----+"; //User Number 7
                break;
            case 8:
                divider = "\n+-----+-----+-----+-----+-----+-----+-----+-----+"; //User Number 8
                break;
            default:
                divider = "\n+----+-----+-----+----+"; //User Number 4
        }
        System.out.println(divider); //Printing Divider at top
        for (int i = 0; i < gameBoard.length; i++) {
            for (int j = 0; j < gameBoard[i].length; j++) {
                if (gameBoard[i][j] == 0) { //If both i & j is == 0
                    System.out.print("|     "); //Print this left border
                }
                if (j == gameBoard[j].length - 1) { //If 2nd array length -1 (end)
                    System.out.print("|"); //Print end border
                }
            }

            System.out.println(divider); //Printing Divider at bottom
        }
    }



    public static int[][] createGameBoard(int userRows) {
        return new int[userRows][userRows]; //Returning rows
    }


    //Method to loop through array to find empty space
    public static int[][] findEmptyCells(int[][] gameBoard)  {
        int freeCellCount = 0;
        int[][] emptyList = new int[gameBoard.length * gameBoard.length][2];
        for (int i = 0; i < gameBoard.length; i++) {
            for (int j = 0; j < gameBoard[i].length; j++) {
                if (gameBoard[i][j] == 0) {
                    emptyList[freeCellCount][0] = i;
                    emptyList[freeCellCount][1] = j;
                    freeCellCount++;
                }
                Random rnd = new Random();
                int rndPair = rnd.nextInt(freeCellCount);
                emptyList[rndPair][0] = i;
                emptyList[rndPair][1] = j;
            }
        }
        return emptyList;
    }

    //Use WASD: W for up, S for Down, A for Left and D for Right
    public static void instructions() {
        System.out.println("How to Play");
        System.out.println("Press W to move up");
        System.out.println("Press S to move down");
        System.out.println("Press A to move left");
        System.out.println("Press D to move right");
    }



    public static void main(String[] args) {
        int rows = gameBoardSize();
        int[][] gameBoard = createGameBoard(rows);
        displayGameBoard(gameBoard, rows);
        instructions();
        int[][] findEmptyCells = findEmptyCells(gameBoard);
    }
}

score 1 · Accepted Answer

除非您需要使用打印到控制台来创建这个游戏 - 我会尽快放弃这种方法。在一个并非设计为像动画窗格一样的空间中创建像 2048 这样的游戏将非常困难和令人沮丧。

相反，我会让每个图块成为一个对象，并对 Java 中的 swing 和 Graphics 进行一些研究。

如果你必须这样做，（顺便说一下，检查你设置网格的方式 - 它不是一致的间距）你必须打印“|”之间的值人物。

这样做的聪明方法是什么？好吧，您可以创建一个 2D int 数组，int[][]并将所有值存储在游戏板上。然后，您可以遍历 2D 数组中的每个元素，并在您的“|”之间打印它人物。下面的这个例子适用于任何大小的二维数组。尝试更改您传入的值的数量，并注意它的行为方式。

public class Test {
    private static int[][] temp = new int[][] {{0,2, 4},{4, 4,16}, {3, 0, 128}};

    public static void main(String[] args) {
        int rows = temp.length;
        int cols = temp[0].length;

        for (int i = 0; i < rows; i++) {
            // This will resize our row separator for each row
            for (int j = 0; j < cols; j++) {
                System.out.print("+-----");
            }

            System.out.print("+\n");

            for (int j = 0; j < cols; j++) {
                System.out.print("|");

                // Here you have to deal with the spacing. You can see that this is ugly.
                // There's definitely better ways to do this, such as using mod
                if (temp[i][j] == 0) {System.out.print("     ");}
                else if (temp[i][j] < 10) {System.out.print("  " + temp[i][j] + "  ");}
                else if (temp[i][j] < 100) {System.out.print("  " + temp[i][j] + " ");}
                else if (temp[i][j] < 1000) {System.out.print(" " + temp[i][j] + " ");}
            }

            System.out.print("|\n");
        }

        for (int j = 0; j < cols; j++) {
            System.out.print("+-----");
        }

        System.out.print("+\n");
    }
}

上述程序的输出：

+-----+-----+-----+
|     |  2  |  4  |
+-----+-----+-----+
|  4  |  4  |  16 |
+-----+-----+-----+
|  3  |     | 128 |
+-----+-----+-----+

但随之而来的是保持间距正确的问题。您需要考虑数字的长度，因为如果数字为空白，您必须打印正确数量的空格。或者您将不得不使用 replace()... 这听起来令人困惑。

score 1 · Accepted Answer

要背负@sleepToken 的答案，您可以使用它String.format来填充您的输出：

public class Test {
  private static int[][] temp = new int[][] {{0,2, 4},{4, 4,16}, {3, 0, 128}};

  public static void main(String[] args) {
      int rows = temp.length;
      int cols = temp[0].length;

      String separator = "+---------------";

      for (int i = 0; i < rows; i++) {
          // This will resize our row separator for each row
          for (int j = 0; j < cols; j++) {
              System.out.print(separator);
          }

          System.out.print("+\n");

          for (int j = 0; j < cols; j++) {
            System.out.print(String.format("|%5s%5s%5s", "", temp[i][j], ""));
          }

          System.out.print("|\n");
      }

      for (int j = 0; j < cols; j++) {
        System.out.print(separator);
      }

      System.out.print("+\n");
  }
}

这将像这样填充：

+---------------+---------------+---------------+
|         0     |         2     |         4     |
+---------------+---------------+---------------+
|         4     |         4     |        16     |
+---------------+---------------+---------------+
|         3     |         0     |       128     |
+---------------+---------------+---------------+

可能必须使用填充值，但我所拥有的格式可以很好地播放到 5 位数字。

下面是另一个示例，说明如何根据您希望最大单元格宽度（长度）的长度进行动态填充：

public class Test {
  private static int[][] temp = new int[][] {{0,2, 4},{4, 4,16}, {3, 0, 8}};

  public static void main(String[] args) {

    int rows = temp.length;
    int cols = temp[0].length;

    int maxCellLength = 15; //define our cell width

    int longestDigit = longestDigit(temp); //get the length of our longest diget

    if (longestDigit > maxCellLength) maxCellLength = longestDigit + 10; //add extra padding if the longest digit is longer than our cell length

    int leftPad = (maxCellLength - longestDigit) / 2;

    int rightPad = maxCellLength - longestDigit - leftPad;

    String fmt = "|%" + leftPad +"s%" + longestDigit + "s%" + rightPad + "s"; //construct our string format

    String separator = "+" + repeat("-", maxCellLength); //construct the separator

    for (int i = 0; i < rows; i++) {
      // This will resize our row separator for each row
      for (int j = 0; j < cols; j++) {
        System.out.print(separator);
      }

      System.out.print("+\n");

      for (int j = 0; j < cols; j++) {
        System.out.print(String.format(fmt, "", temp[i][j], ""));
      }

      System.out.print("|\n");
    }

    for (int j = 0; j < cols; j++) {
      System.out.print(separator);
    }

    System.out.print("+\n");
  }


  public static int longestDigit(int[][] arr) {
    int longest = 0;
    for(int i = 0; i < arr.length; i++) {
      for (int j = 0; j < arr[i].length; j++) {
        String intStr = String.valueOf(arr[i][j]);
        if (intStr.length() > longest) longest = intStr.length();
      }
    }

    return longest;
  }

  private static String repeat(String n, int length) {
    StringBuilder sb = new StringBuilder();
    for(int i = 0; i < length; i++) {
      sb.append(n);
    }
    return sb.toString();
  }

}

java - 用随机列表中的 2 个值填充 2D 数组（2048 游戏）

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