How to print a 2D array to matrix format

You can try adding some print statements:

int[][] out = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; for (int x = 0; x < out.length; x++) { System.out.print("{"); for (int y = 0; y < out[0].length; y++) { System.out.print(out[x][y] + ","); } if (x != out.length - 1) { System.out.println("},"); } else { System.out.println("}"); } } 

Demo:

{1,2,3,}, {4,5,6,}, {7,8,9,} 

Note: You can also use a StringBuilder:

int[][] out = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; StringBuilder sb = new StringBuilder(); for (int x = 0; x < out.length; x++) { sb.append("{"); for (int y = 0; y < out[0].length; y++) { sb.append(out[x][y]).append(","); } sb.append("},\n"); } sb.deleteCharAt(sb.length() - 1).deleteCharAt(sb.length() - 1); System.out.println(sb.toString()); 

Just use this, it is all you need.

 for (int[] out1 : out) { Arrays.toString(out1); } 

Remember to add following : import java.util.Arrays;

If you insist on output exactly as you write, you can do following

 for (int[] out1 : out) { System.out.print(Arrays.toString(out1).replaceAll("\\[", "{").replaceAll("\\]", "}")); } 

But there remains comma on last line, so if you do not want it there, you have to check it

 for (int[] out1 : out) { System.out.print(Arrays.toString(out1).replaceAll("\\[", "{").replaceAll("\\]", "}")); if (out1 != out[out.length-1]){ System.out.print(","); } System.out.println(""); }