How to create char[][] from String?

Question

I got a little problem here with Java and I am fairly new to it.

My program reads a String via InputStreamReader and saves it in the String input.

How do I save the elements of the String in a 2d char array with n x m elements?

Edit: I think I´ve got a solution:

I used 2 for-loops (is that the right english translation for it? ) and .toCharArray to convert the String.

public static char[][] transform (String text, int arrBreite, int arrLaenge) {
    char[][] returnArray = new char[arrBreite][arrLaenge];

    char[] buffer = text.toCharArray();
    for (int i = 0; i < arrBreite; i++) {
        for (int j = 0; j <arrLaenge; j++) {
            if (((i * arrBreite) + j) > buffer.length - 1) returnArray[i][j] = " ".charAt(0);
            else returnArray[i][j] = buffer[(i*arrBreite)+j];
        }
    }

    return returnArray;
}

Thanks for your help guys.

Please provide an example how you want chars to be placed inside your char[][]?! Giving input and a matrix how it should look like after work is done. — Fabian Barney
– Fabian Barney, Commented Dec 15, 2011 at 13:37
There's no natural mapping from a String to a 2d character array. What exactly are the requirements here? How do you know what the dimensions of your 2d array are? — Shaun
– Shaun, Commented Dec 15, 2011 at 13:37
I´ve to do a Scytale De-/Encrypter and we should use an 2D Array for it. — Seph
– Seph, Commented Dec 15, 2011 at 13:45

hexacyanide · Accepted Answer · 2014-03-29 01:03:45Z

1

You can use the toCharArray() method to get a char array from your String.

If you need to split with a given delimiter to determine the array lines, you use first the Split method on the String, then use toCharArray to create your 2 dimensional array.

edited Mar 29, 2014 at 1:03

hexacyanide

92.4k31 gold badges168 silver badges162 bronze badges

answered Dec 15, 2011 at 13:38

LaGrandMere

10.4k1 gold badge36 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

hexacyanide · Accepted Answer · 2014-03-29 01:04:15Z

0

You should use String.toCharArray().

edited Mar 29, 2014 at 1:04

hexacyanide

92.4k31 gold badges168 silver badges162 bronze badges

answered Dec 15, 2011 at 13:34

kbdjockey

8977 silver badges8 bronze badges

Collectives™ on Stack Overflow

How to create char[][] from String?

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related