Adding 2d arrays to 1d arrays

Question

How can I add a 2d array into 1d array in java? Whenever I try to do that this message pops up:

Type Mismatch: cannot convert from char[][] to char

This is my code::

int numberOfCases = Integer.parseInt(scanner.nextLine());

char[] grids = new char[numberOfCases];

for(int i = 0; i < numberOfCases; i++) {
    while(scanner.hasNext()) {
        int gridDimensions = Integer.parseInt(scanner.nextLine());
        grids[i] = new char[gridDimensions][gridDimensions];

    }
}

Please help or give an alternative to what I am doing.

You are trying to add an two dimensional array to a char array. The char array can only contain chars. Otherwise you have to change that to char[][][] grids. — Stephan
– Stephan, Commented Nov 23, 2013 at 8:07
If you already have 2d arrays and want to keep them in an array, it adds one dimension, so you need a 3d array. — Stephan
– Stephan, Commented Nov 23, 2013 at 8:12

Kevin Ji · Accepted Answer · 2013-11-23 08:11:08Z

3

Make your grids variable three-dimensional:

char[][][] grids = new char[numberOfCases][][];

Then, you should be able to add your two-dimensional array into this grids array.

answered Nov 23, 2013 at 8:11

Kevin Ji

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Kevin Ji Over a year ago

@MohammadAreebSiddiqui It works for me... all you need to do is modify the char[] grids line, nothing else.

Dylan Meeus · Accepted Answer · 2013-11-23 08:08:48Z

1

You actually instantiate a new char[][] and trying to make it equal to char[]

   grids[i] = new char[gridDimensions][gridDimensions];

That's what is going wrong.

Try to loop over all values in the multidimensional array, and adding them one per one to a 1d array :)

answered Nov 23, 2013 at 8:08

Dylan Meeus

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2 Comments

Mohammad Areeb Siddiqui Over a year ago

I then will have problems in the next step of my logic.

Dylan Meeus Over a year ago

@MohammadAreebSiddiqui Which is? I don't know any other way to add them than to loop over all of them. If you really want to have a 1d array. The three dimensional approach might work just as well though :)

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