Question

I’m looking for a suggestion.
I have a Person class with String firstName and String lastName
When i’m tying to insert the list values with the same String like :

set.add(new Person("firstName","lastName"))

set.add(new Person("firstName","lastName"))

The set doesn`t filter the objects and they still getting in the set.
There is any suggestion to create set list without overriding the equales and hashcode functions?
Maybe with guava or some groovy list?
Thanks,
Or.

Answer 1

You can create a TreeSet with your own Comparator.

Set<Person> set = new TreeSet<Person>(new Comparator<Person>() {
    @Override
    public int compare(Person p1, Person p2) {
        // Your own compare logic
    }
});