How to change all elements in a 2D Array to the same value using for loops in java

Question

This is my first time asking a question here, so forgive me if my formatting is a little sloppy.

I need to know how to set all the elements of a 2D Array to the same value, using for loops, with Java.

I was able to get this far:

import java.util.Arrays;

public class TheArray{
    public static void main (String[] args){

        int[][] pixels = new int[768][1024];

        for(int i = 0; i < pixels.length; i++){

            for(int j = 0; j < pixels[i].length; j++){
                Arrays.fill(pixels[i], 867);


            }

        }

    }
}

However I have no idea if I have done it right. So all I want it to do is make all of the elements of the 2D array be 867.

It would run, but since I was using a really basic way to test if it was indeed replacing all of the elements with 867, I was unsure if it was doing what it was supposed to be doing. It's all sorted out now though. — GL007
– GL007, Commented Sep 1, 2015 at 19:15

durron597 · Accepted Answer · 2015-09-01 16:14:23Z

4

You don't need to use Arrays.fill if you're already using for loops. Just do:

for(int i = 0; i < pixels.length; i++){
    for(int j = 0; j < pixels[i].length; j++){
       pixels[i][j] = 867;
    }
}

Arrays.fill would be used instead of the inner for loop.

edited Sep 1, 2015 at 16:14

answered Sep 1, 2015 at 15:46

durron597

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2 Comments

GL007 Over a year ago

Hey, thanks a lot man! I really appreciate it, and this helped me to understand both ways of doing this. (the for loop and the Arrays.fill)

durron597 Over a year ago

@GL007 Glad I could help.

Nabin Bhandari · Accepted Answer · 2015-09-01 15:48:00Z

0

Use the following line inside your loop:

pixels[i][j] = 867;

answered Sep 1, 2015 at 15:48

Nabin Bhandari

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