Is it possible in java make something like Comparator but for implementing custom equals() and hashCode()

Question

I have an array of objects and I want to concatenate it with another array of objects, except that objects that have same id\'s. That objects are used in many places in the

Answer 1

Use Guava Equivalence:

Equivalence equivalence = new Equivalence() {
    @Override
    protected boolean doEquivalent(T a, T b) {
        return CustomComparator.equals(a, b);
    }

    @Override
    protected int doHash(T item) {
        return CustomHashCodeGenerator.hashCode(item);
    }
};
List items = getItems();
Set> setWithWrappedObjects = items.stream()
    .map(item -> equivalence.wrap(item))
    .collect(Collectors.toSet());