Question

How to declare and initialize and print two-dimensional (2D) array (matrix) in Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        int[][] arr = new int[][]
        {
            {1, 2, 3, 4},
            {5, 6, 7, 8},
            {9, 10, 11, 12}
        };
 
        int rows = arr.length;
        int cols = arr[0].length;
 
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                System.out.printf("%3d", arr[i][j]);
            }
            System.out.println();
        }
    }
}
 
 
 
 
 
/*
run:
  
  1  2  3  4
  5  6  7  8
  9 10 11 12
  
*/

 

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