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I've adjusted my code to use ArrayList instead of HashMap.
I've included comments to explain what is happening.

I've tried executing the code in the Java Tutor at Java Tutor - Visualize Java code...

For example, would this code be a possible solution?



public class Kata {

public static int[] arrayDiff(int[] a, int[] b) {
HashSet<Integer> result = new HashSet<>();
...

Sorry about that. New to this forum.

To be honest those questions about what is in the arguments isn't really the issue.
But I will try posting another question on Codewars and see if I can get...

I am trying to solve the ArrayDiff challenge on CodeWars with the Java language. I've already completed Javascript and Python, but I'm less familiar with Java and I cannot figure it out. Ive already...