2D array static initialisation in java

Question

How to initialise the below 2D static array ? The following works:

static int[][] arr = { {1,2}, {3,4} };
static int[][] arr = new int[][]{ {1,2}, {3,4} };

but what if I want to initialise with a larger data maybe using a for loop ?

class Abc {
    static int[][] arr;
}

where is the issue? Are you asking for how to write a loop or how to add a values in 2-D array? — Braj
– Braj, Commented Aug 20, 2014 at 18:12
@user3218114 For someone with a relatively high reputation, I'm surprised you haven't changed your default usernames. — But I'm Not A Wrapper Class
– But I'm Not A Wrapper Class, Commented Aug 20, 2014 at 18:21

Eran · Accepted Answer · 2014-08-20 18:13:10Z

2

Here's an example of how to initialize the array in a static initializer block. Of course, it's not very interesting, since all the integers in the array are identical.

class Abc {
    static int[][] arr;

    static {
       arr = new int[100][300];
       for (int i=0;i<arr.length;i++) {
           for (int j=0;j<arr[i].length;j++) {
               arr[i][j] = 7;
           }
       }
    }
}

answered Aug 20, 2014 at 18:13

Eran

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Matthieu · Accepted Answer · 2014-08-20 18:11:31Z

2

You can add a static initializer block. You can see the documentation here.

answered Aug 20, 2014 at 18:11

Matthieu

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