Java中的2D阵列打印格式

Question

我有一个任务，要求用户输入二维数组的大小，然后询问数组中的数字，然后进行一些计算（如总和& max） 。 我遇到麻烦的是，当它向用户询问数组中的数字时，我无法对它进行格式化，以便按照它应该分配的方式进行格式化。在显示最终数组的格式时也遇到麻烦，它也应该处于这种状态。

实施例用于用户输入：

输入[0] [0]：

输入[0] [1]：

等等

实施例用于阵列天线的最终显示：

[1,2,3]

[4,5,6]

等

这是我的代码到目前为止，我已经评论了我需要帮助的部分。

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

class Array2DMethods { 

    public static int[][] readInputs() { 
     Scanner keyboard = new Scanner(System.in); 

     System.out.print("  How many rows? "); 
     int rows = keyboard.nextInt(); 

     System.out.print("  How many columns? "); 
     int columns = keyboard.nextInt(); 

     int[][] ret = new int[rows][columns]; 

     for (int i = 0; i < ret.length; i++) { 
      for (int j = 0; j < ret[i].length; j++) { 
       /*Need to format it like this: Enter [0][0]: 
       Enter [0][1]: 
       etc. until it forms the 2D Array but not sure how to get 
       it to print out like that. 
       */ 
       System.out.print("  Enter " + ret + ": "); 
       ret[i][j] = keyboard.nextInt(); 
      } 
     } 

     return ret; 
    } 

    public static int max(int[][] anArray) { 
     int ret = Integer.MIN_VALUE; 

     for (int i = 0; i < anArray.length; i++) { 
      for (int j = 0; j < anArray[i].length; j++) { 
       if (anArray[i][j] > ret) { 
        ret = anArray[i][j]; 
       } 
      } 
     } 

     return ret; 
    } 

    public static void rowSum(int[][] anArray) { 
     int rows = anArray.length; 
     int cols = anArray[0].length; 

     int[] sum = new int[rows]; 
     for (int i = 0; i < rows; i++) { 
      for (int j = 0; j < cols; j++) { 
       sum[i] += anArray[i][j]; 
      } 
     } 

     for (int x = 0; x < anArray.length; x++) { 
      System.out.println("Sum of row " + x + " = " + sum[x]); 
     } 
    } 

    public static void columnSum(int[][] anArray) { 
     int rows = anArray.length; 
     int cols = anArray[0].length; 

     int[] sum = new int[cols]; 
     for (int i = 0; i < cols; i++) { 
      for (int j = 0; j < rows; j++) { 
       sum[i] += anArray[j][i]; 
      } 
     } 

     for (int x = 0; x < anArray.length || x > anArray.length; x++) { 
      System.out.println("Sum of columnn " + x + " = " + sum[x]); 
     } 
    } 

    public static boolean isSquare(int[][] anArray) { 

     for (int i = 0, l = anArray.length; i < l; i++) { 
      if (anArray[i].length != l) { 
       return false; 
      } 
     } 
     return true; 
    } 

    public static void displayOutputs(int[][] anArray) { 
     System.out.println("Here is your 2Dim Array:"); 
     for (int i = 0; i < anArray.length; i++) { 
      for (int j = 0; j < anArray[i].length; j++) { 
       System.out.print(anArray[i][j]); 

       /*When displaying the whole array before the end of the program 
       it needs to be formatted like this: 
       [1,2,3] 
       [4,5,6] 
       [7,8,9] 
       but I'm not sure how to get it to print like that. 
       */ 
       System.out.print(", "); 
      } 
      System.out.println(); 
     } 
    } 
} 

class Arrays2DDemo { 

    public static void main(String[] args) { 

     System.out.println("Let's create a 2Dim Array!"); 

     int[][] anArray = Array2DMethods.readInputs(); 

     Array2DMethods.max(anArray); 
     System.out.println(); 
     Array2DMethods.rowSum(anArray); 
     System.out.println(); 
     Array2DMethods.columnSum(anArray); 

     Array2DMethods.isSquare(anArray); 
     System.out.println("\nIs this a square array? " + Array2DMethods.isSquare(anArray)); 

     System.out.println(); 
     Array2DMethods.displayOutputs(anArray); 
    } 
} 

感谢任何帮助，您可以给我。

Answer 1

对于输入部分：

System.out.print(String.format("  Enter [%d][%d]: ", i, j)); 
ret[i][j] = keyboard.nextInt(); 

对于输出部分：

for (int[] row : anArray) { 
    System.out.println(Arrays.toString(row)); 
} 

Answer 2

尝试此输入部分：

System.out.print("  Enter ["+ i +"]["+ j +"] : "); 

对于输出：

for(int i=0; i<anArray.length; i++){ 
    System.out.println("["); 
     for(int j=0; j<anArray[i].length; j++){ 
      System.out.print(anArray[i][j]+" "); 
      System.out.print(","); 
     } 
     System.out.print("\b"); 
     System.out.print("]"); 
    }