print a matrix in java

/**
 * @author lautturi.com 
 * Java example: print the array as matrix in java
 */

import java.util.*;
import java.util.stream.IntStream;

public class Lautturi {
	public static void main(String[] args) {
		int[][] arr = {{1, 2, 3},{4, 5, 6}, {7, 8,9}};
		for (int row = 0; row < arr.length; row++) 
		{
		  for (int col = 0; col < arr[row].length; col++) 
		  {
		    System.out.printf("%4d", arr[row][col]); 
		  }
		  System.out.println();  
		}
	}
}

output:

1   2   3
   4   5   6
   7   8   9