How to print 2D array simplest way with foreach loop?

Question

I was wondering what the simplest way of printing a 2D array? I know we can print 1D array just like this code below.

int[ ] numbers = {2, 3, 5, 7};    
for (int print: numbers) {
   System.out.println(print); 
}

I tried to print the code below of course it didn't work.

int[ ][ ] numbers= { {1, 2, 3}, {4, 5, 6} }; 
for (int print: numbers) {
       System.out.println(print); 
    }

I know I can print with nested loops like the code below but I was wondering if I can use foreach loop just like 1D array. Thank you

 int[ ][ ] numbers= { {1, 2, 3}, {4, 5, 6} }; 
    for (int i = 0; i < numbers.length; i++) {
            for (int j = 0; j < numbers[i].length; j++) {
                System.out.print(numbers[i][j] + " ");
            }
            System.out.println();
        }
}

J-Alex · Accepted Answer · 2018-04-21 20:08:18Z

2

In 2-dimensional array each element in first loop will be an 1-dimensional array, in second loop each element is a number itself:

int[][] array2d = {{1, 2, 3}, {4, 5, 6}};
for (int[] array : array2d) {
    for (int element : array) {
        System.out.print(element + " ");
    }
    System.out.println();
}

Actually, there is a better way using Arrays::toString library method:

int[][] numbers = {{1, 2, 3}, {4, 5, 6}};
for (int[] array : numbers) {
    System.out.println(Arrays.toString(array));
}

edited Apr 21, 2018 at 20:08

answered Apr 21, 2018 at 20:04

J-Alex

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1 Comment

Sami Over a year ago

Thank you @J-Alex! It is what I have been trying to do last 45 minutes :)

Abdo Bmz · Accepted Answer · 2018-04-21 20:25:56Z

2

print 2D array simplest way with foreach loop :

Exmple :

 public class Print2DArr {


            public static void main(String[] args) {
                // TODO Auto-generated method stub

                         int[ ][ ] numbers= { {1, 2, 3}, {4, 5, 6} }; 
                              for (int[] arr:  numbers) {
                              for (int num :  arr ) {
                              System.out.print(num +  " ");
                    }
                    System.out.println();
                }
             }

          }

Output :

1 2 3 
4 5 6

However, the libs do supply the method deepToString for this purpose, so this may also suit your purposes:

public class Print2DArr {


    public static void main(String[] args) {
        // TODO Auto-generated method stub

                 int[ ][ ] numbers= { {1, 2, 3}, {4, 5, 6} }; 
                   System.out.println(Arrays.deepToString(numbers));

}

Output :

[[1, 2, 3], [4, 5, 6]]

edited Apr 21, 2018 at 20:25

answered Apr 21, 2018 at 20:22

Abdo Bmz

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1 Comment

Abdo Bmz Over a year ago

Try my second purposes!

AS Mackay · Accepted Answer · 2019-07-20 16:01:37Z

1

You can use Stream.of() for that too:

Stream.of(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}).forEach(x -> {
        System.out.println(Arrays.toString(x));
    });
Output: [1, 2, 3]
        [4, 5, 6]
        [7, 8, 9]

But Arrays.deepToString() is a better way I think.

System.out.println(
        Arrays.deepToString(
            new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
        ));
Output: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

edited Jul 20, 2019 at 16:01

AS Mackay

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answered Jul 20, 2019 at 15:38

Ritam Chakraborty

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Comments

Laurel · Accepted Answer · 2022-01-11 00:10:40Z

0

Here is my attempt to use a foreach loop to print a 2D array:

public class MyClass
{

    public static void main(String[] args)
    {
        int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

        // To access the elements of the myNumbers array,
        // specify two indexes: one for the array, and one
        // for the elements inside that array.

        for(int i : myNumbers[0]) // Here accessing the first array with index 0:
        {
            System.out.println(i);
        }
        for(int j : myNumbers[1]) // Here accessing the second array with index 1:
        {
            System.out.println(j);
        }
    }
}

Output: 1 2 3 4 5 6 7

edited Jan 11, 2022 at 0:10

Laurel

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answered Jan 10, 2022 at 18:23

Arnold Saikia

1

1 Comment

Saites Over a year ago

Compared to the other answers here, yours requires knowing ahead of time that you'll have exactly two arrays nested within myNumbers. If you were to add another one, it won't get printed, and if you removed one (or both) of the nested arrays, the code would crash.

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