Java Constructor variables being ignored

Question

I am trying to create a instance of the object Iset. When the person makes the object they have to give an int which will be the size of a boolean array that will store a set of

Answer 1

You are not initializing the size instance variable properly, instead you are initializing a local variable size. Therefore your size instance variable remained initialized with 0 and your seti instance variable is an empty array causing the out of range error.

As pointed out by others, you don't need the instance variable size.
There is also no need for another local variable size inside your constructor, Just use seti.length to determine the size of the array. To simplify, your code should be:

public class Iset {
boolean[] seti;

ISet(int a) {
    seti = new boolean[a];

I would recommend you use static analysis tools like checkstyle to eliminate bug like this in your codes.