Comparison between Objects always returns false

Question

Why even with that: ValidacaoHelper.saoIguais(3044, 3044), that is, with equal parameters, the return is false?

/**
 * @param obj
 *            objeto a ser validado
 * @return TRUE se o objetos passados por parâmetro forem iguais
 */
public static boolean saoIguais(Object obj, Object obj2) {
    boolean iguais = false;

    if (obj == obj2) {
        iguais = true;
    } 
    return iguais;
}

Answer 1

Because Object is a type by reference, so the comparison is with the addresses of the objects and not with the values that are within them. Since they’re two different objects, they’re different addresses, so it’s always different.

See more in Memory allocation in C# - Value types and reference types. It’s C#, but it’s the same thing, only C# allows you to create your types by value only Java 10 will allow this.

That’s how it works, but it’s not the way you think, it’s not because the value is the same, it’s because it’s the same object.

class Ideone {
    public static void main (String[] args) {
        Object x = 3044;
        Object y = x;
        System.out.println(saoIguais(x, y));
    }
    public static boolean saoIguais(Object obj, Object obj2) {
        return obj == obj2;
    }
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.