Store an array within a 2d array Java

Question

So why doesn't this work? Not really sure why this isn't possible- I just want to store an array of size 2 inside a 2d array.

I know this would be equivalent to setting storage[0][0] = array[0] and storage[0][1] = array[1], but just wondering why this is incorrect.

public class Test {

    public static void main(String[] args) {
        boolean[][] storage = new boolean[10][2];
        boolean[] array = new boolean[2];
        array[0] = true;
        array[1] = false;

        storage[0][] = array; //Why can't I do this?
    }
}

Thanks in advance

Should be storage[0]= array;, because if storage is a 2-dim array storage[i] is a 1-dim array, like your array variable. — Alexis C.
– Alexis C., Commented Dec 16, 2013 at 22:37

chrylis -cautiouslyoptimistic- · Accepted Answer · 2013-12-16 22:36:02Z

3

You have a stray pair of brackets in your assignment. Just use

storage[0] = array;

answered Dec 16, 2013 at 22:36

chrylis -cautiouslyoptimistic-

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1 Comment

chrylis -cautiouslyoptimistic- Over a year ago

@FraserPrice I note that you haven't accepted answers on any of the questions you've asked. If an answer is helpful, please upvote, and if one solves your problem, accept it.

Seagull · Accepted Answer · 2013-12-16 22:46:12Z

0

First of all boolean[][] storage = new boolean[10][2] declares an array and initialise it.

So, you have created 11 arrays. One of boolean[] element type and 10 of boolean type.

It's good, If you want to access it's members directly, but if you create an inner array lately with new boolean[], it's an overhead.

Use boolean[][] storage = new boolean[10][]; instead.

Then, you can access it's elements, which are boolean[] type, and assign your array to it.

storage[0] = array;

answered Dec 16, 2013 at 22:46

Seagull

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Comments

user7627726 · Accepted Answer · 2017-07-12 17:44:20Z

0

Your problem is the stray square brackets(as I'm sure you know). Your code should look like this:

storage[0] = array;

The previous answers did not really explain why though, so that's what I'll do.

What your trying to do is make the first position(storage[0]) hold the same value as array. array is 1 dimensional, so it can only be part of storage, which is 2 dimensional.

answered Jul 12, 2017 at 17:44

user7627726

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