How do I add values in an int array for another value in that array, in java?

Question

In Java, I made an int array, and I want to add several of those values together to get another value in that same array, but I'm (understandably) getting an error message that says "variable might not have been initialized." Here is the code:

public static void random(){
    Random rand = new Random();
    int[] colours = {rand.nextInt(20)+1,rand.nextInt(20)+1,(100-(colours[0]+colours[1]))};

What I want to have happen, here, is for the first element of "rand.nextInt(20)+1" (let's call it "value A") to be added to (what we'll call) value B to get value C (the "100-colours[0]+colours[1]"). I want (100-A+B)=C for my third value. Is there any way I can do this while keeping value C in the array? I'm going to be putting these values through a for loop, and I want each value to correspond with the number of loops (basically, I want one value put out with each loop; loop 1 outputs A, loop 2 outputs B, loop 3 outputs C).

Calling array when array is not finished initialising is getting you error. And then use shmosel’s method to put value at next position. — Neeraj Yadav
– Neeraj Yadav, Commented Dec 27, 2017 at 7:30

shmosel · Accepted Answer · 2017-12-27 07:04:56Z

3

Just default the last element to 0 (or any other value) and then update it in the next line:

Random rand = new Random();
int[] colours = {rand.nextInt(20)+1, rand.nextInt(20)+1, 0};
colours[2] = 100-(colours[0]+colours[1]);

answered Dec 27, 2017 at 7:04

shmosel

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1 Comment

Ray25Lee Over a year ago

Perfect! Solved my problem :] Thank you!! Good method, wicked simple; should've thought of it, but I'm just getting back into Java after a several month hiatus. I appreciate the help.

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