printing out a 2-D array in Matrix format

Question

How can I print out a simple int [][] in the matrix box format like the format in which we handwrite matrices in. A simple run of loops doesn\'t apparently work. If it helps

Answer 1

public static void printMatrix(double[][] matrix) {
    for (double[] row : matrix) {
        for (double element : row) {
            System.out.printf("%5.1f", element);
        }
        System.out.println();
    }
}

---

Function Call

printMatrix(new double[][]{2,0,0},{0,2,0},{0,0,3}});

Output:

  2.0  0.0  0.0
  0.0  2.0  0.0
  0.0  0.0  3.0

---

In console:

Answer 2

public class Matrix 
{
   public static void main(String[] args)
   {
      double Matrix [] []={
         {0*1,0*2,0*3,0*4),
         {0*1,1*1,2*1,3*1),
         {0*2,1*2,2*2,3*2),
         {0*3,1*3,2*3,3*3)
      };

      int i,j;
      for(i=0;i<4;i++)
      {
         for(j=0;j<4;j++)
            System.out.print(Matrix [i] [j] + " ");
         System.out.println();
      }
   }
}

Answer 3

int[][] matrix = {
    {1,2,3},
    {4,5,6},
    {7,8,9},
    {10,11,12}
};

printMatrix(matrix);

public void printMatrix(int[][] m){
    try{
        int rows = m.length;
        int columns = m[0].length;
        String str = "|\t";

        for(int i=0;i<rows;i++){
            for(int j=0;j<columns;j++){
                str += m[i][j] + "\t";
            }

            System.out.println(str + "|");
            str = "|\t";
        }

    }catch(Exception e){System.out.println("Matrix is empty!!");}
}

Output:

|   1   2   3   |
|   4   5   6   |
|   7   8   9   |
|   10  11  12  |