我如何限制二维数组用户输入并输出其余值“。”？

Question

我要做的是给用户 5 个输入（棋子），Rook，Bishop，King，Queen，Knight。并将它们输出到网格中，我不确定如何将用户输入限制为 5 次并用“。”打印网格的其余部分

我的输出结果现在是下面的网格，但是我如何获取 Qb2（Queen，在第 2 列，在第 2 行？））的用户输入并将其放入网格中？等等碎片？

Output of the result I get vs the output of the sample given

注意：列从“A”到“H”，行从底部开始，因此从“第 1 行”到“第 8 行”。

. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . . 
. . . . . . . .

我的代码：

import java.util.Scanner;
        class chessMoves
        {
          //MAIN CODE AT THE VERY BOTTOM OF THE CLASS
          Scanner sc = new Scanner(System.in);

          private String[][] grid = new String[8][8];
          //target is x, so if x is at location in the grid, your program should determine if
          // any of the pieces can move to that position.
          private String king,queen,rook,bishop,knight,target;

          public void chessPieces(){

            //remember you're only using the peices in scanner for a string just for a test
        //switch them to 2D Array so that i can as
      System.out.println("Hello Guest00129, Welcome to Chess.");
      System.out.println("In order to play this game, input pieces like below(cap;atilaized)");
      System.out.println("Rook at column c and at row 5 then: Rc5");

      System.out.println("Please enter a position for Rook");
      rook = sc.nextLine();
      System.out.println("Please enter a position for King");
      king = sc.nextLine();
      System.out.println("Please enter a position for Queen");
      queen = sc.nextLine();
      System.out.println("Please enter a position for Bishop");
      bishop = sc.nextLine();
      System.out.println("Please enter a position for Knight");
      knight = sc.nextLine();
      System.out.println("Please enter a position for Target(X) to move the peices to that position");
      target = sc.nextLine();
      }
      public void printGrid(){      
            for(int row = 0; row <grid.length; row++){
          for (int column = 0;column <grid[row].length; column++){
            grid[row][column] = ".";
            System.out.printf("%2s",grid[row][column] + " ");
          }
          System.out.println();
      }
      }
      //get the userinput working first then make a file that gets the information for that userinput and outputs here
      public void readChessPositions(){
      }
      //the file created from the method above read it print the grid here like printout here and show the possible
      //positons that can attack 
      public void chessOutput(){
      }
      //method that prints the grid with the positiosn showed in the outputfile of chess moves
      //print all empty spaces with dot(.) and the postiions
      public static void main (String[] args){
        chessMoves test1 = new chessMoves();
        test1.chessPieces();
        test1.printGrid();
      }
    }

Answer 1

“我的输出结果现在是下面的网格，但是我怎样才能获得 Qb2（女王，在第 2 列，在第 2 行？））的用户输入并将其放入网格中？等等碎片 ？” 用户将始终输入包含三个字符的字符串。 使用 charAt(int index)。 编辑1：（阅读评论后） 这是代码，运行它并告诉我这是否是您希望程序执行的操作。

    import java.util.Scanner;
    class chessMoves
    {
      //MAIN CODE AT THE VERY BOTTOM OF THE CLASS
      Scanner sc = new Scanner(System.in);

      private String[][] grid = new String[8][8];
      //target is x, so if x is at location in the grid, your program should determine if
      // any of the pieces can move to that position.
      private String king,queen,rook,bishop,knight,target;

      public void chessPieces(){

        //remember you're only using the peices in scanner for a string just for a test
    //switch them to 2D Array so that i can as
  System.out.println("Hello Guest00129, Welcome to Chess.");
  System.out.println("In order to play this game, input pieces like below(cap;atilaized)");
  System.out.println("Rook at column c and at row 5 then: Rc5");

  System.out.println("Please enter a position for Rook");
  rook = sc.nextLine();
  System.out.println("Please enter a position for King");
  king = sc.nextLine();
  System.out.println("Please enter a position for Queen");
  queen = sc.nextLine();
  System.out.println("Please enter a position for Bishop");
  bishop = sc.nextLine();
  System.out.println("Please enter a position for Knight");
  knight = sc.nextLine();
  System.out.println("Please enter a position for Target(X) to move the peices to that position");
  target = sc.nextLine();
  }
  public void printGrid(){      
        for(int row = 0; row <grid.length; row++){
      for (int column = 0;column <grid[row].length; column++){
        grid[row][column] = ".";
      }
  }    
   grid[7-rook.charAt(2)+49][(int)rook.charAt(1)-97] = "r";
   grid[7-bishop.charAt(2)+49][(int)bishop.charAt(1)-97] = "b";
   grid[7-queen.charAt(2)+49][(int)queen.charAt(1)-97] = "q";
   grid[7-king.charAt(2)+49][(int)king.charAt(1)-97] = "k";
   grid[7-knight.charAt(2)+49][(int)knight.charAt(1)-97] = "i";
   grid[7-target.charAt(2)+49][(int)target.charAt(1)-97] = "x";


        for(int row = 0; row <grid.length; row++){
      for (int column = 0;column <grid[row].length; column++){
          System.out.printf("%2s",grid[row][column] + " ");
      }
      System.out.println();
  }

  }   
  //get the userinput working first then make a file that gets the information for that userinput and outputs here
  public void readChessPositions(){
  }
  //the file created from the method above read it print the grid here like printout here and show the possible
  //positons that can attack 
  public void chessOutput(){
  }
  //method that prints the grid with the positiosn showed in the outputfile of chess moves
  //print all empty spaces with dot(.) and the postiions
  public static void main (String[] args){
    chessMoves test1 = new chessMoves();
    test1.chessPieces();
    test1.printGrid();
  }
}

为了解释我在做什么，让我解释一下 charAt() 返回一个字符。当类型转换为整数时，字符 a、b、c、d 将给出值 97、98、99...等等。类似的字符 1， 2,3,4... 将给出 47,48,49。 现在，当用户输入 rc7（比如说）时，代码采用对应于 c 和 7.c 对应于 99 的 2d 矩阵位置，您需要将其设为 2，因此减去 97（您可以在代码中看到）。同样，您可以看到 7 将如何变为 1。 如果您不明白，我建议您阅读有关 ASCII 和 Unicode 的内容。基本上 ecah 字符被分配了一个数字代码，仅此而已。 我把你的字符输入转换成整数放到网格上。

现在，让你的作品到达目标。为此定义另一个方法 boolean inScope(int[][] grid,string piece),在函数中定义一个二维数组（局部）让它成为8X8 并使其为int类型并将所有元素初始化为零。使数组可以到达的元素为1。如果目标位于1的位置。您的棋子可以到达那里，返回true。