Java XNOR operator

boolean xnor(boolean a, boolean b) {
    return !(a ^ b);
}

or even simpler:

boolean xnor(boolean a, boolean b) {
    return a == b;
}

If you are actually talking about bitwise operators (you say you’re operating on int), then you will need a variant of the first snippet:

int xnor(int a, int b) {
    return ~(a ^ b);
}