How to get column in 2-D array in java by Foreach loop?

Question

I can get a row from a 2D array in java by foreach loop like :

        int[][] array = new int[5][5] 
        for (int[] row : array) {
        for (int c : row) {
        }
        }

But How can I get the column form 2D array by foreach loop ? Or is this possible to get column from 2D array by foreach loop ?

Thank you.

Can you clarify the question? Do you want the index of the column, using foreach means you dont get an index. If you want the index use a traditional for loop. — Magnus
– Magnus, Commented Feb 28, 2016 at 9:23
Are you sure that your array is a perfect square matrix (N x N) of same length and width. — PyThon
– PyThon, Commented Feb 28, 2016 at 9:43

PyThon · Accepted Answer · 2016-02-28 09:40:24Z

4

One alternative can be

    int i =0;
    for (int k : array[0]){
        for (int[] row : array) {
            System.out.println(row[i]);
        }
        i++;
    }

answered Feb 28, 2016 at 9:40

PyThon

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1 Comment

seal Over a year ago

This is a clever one. :D

Eran · Accepted Answer · 2016-02-28 09:39:08Z

1

It's not possible. You'll have to use the traditional for loop :

int[][] array = new int[5][5] 
for (int j = 0; j < array[0].length; j++) {
    for (int i = 0; i < array.length; i++) {
        int current = array[i][j];
    }
}

edited Feb 28, 2016 at 9:39

answered Feb 28, 2016 at 9:22

Eran

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Comments

Leo The Four · Accepted Answer · 2016-02-29 08:36:17Z

2D array is just a conceptual meaning. in fact 2d array is a combination of multiple one-dimensional array. Therefore you cannot access the columns without using a counter. even if you use for each loop you need a counter inside.

If you need to get all the columns then you can make a loop with number of column. But in this case all the rows should have the same number of columns (elements)

public static void main(String[] args)
{
    int [][] yourArray = {{1,2,3,4,5,6},//sample 2d array with 6 rows and six columns
                    {1,2,3,4,5,6},      //this is actually a collection of 6 different 1d arrays
                    {1,2,3,4,5,6},
                    {1,2,3,4,5,6},
                    {1,2,3,4,5,6},
                    {1,2,3,4,5,6}};

    int yourColumn = 3; //example of selected column (be careful columns start from 0)

    for(int[] row: yourArray)
    {
        System.out.println(row[yourColumn]);
    }

}

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