How do I use HashSet in Java?

How do I use HashSet in Java?

A HashSet in Java is a collection that implements the Set interface, allowing you to store unique elements.

Can you show me a simple example of how to create and use a HashSet?

Sure! Here's a basic example:

import java.util.HashSet;

public class Main {
    public static void main(String[] args) {
        HashSet<String> set = new HashSet<>();
        set.add("Apple");
        set.add("Banana");
        set.add("Orange");
        System.out.println(set);
    }
}

This code creates a HashSet and adds three fruit names to it.

What happens if I try to add a duplicate element?

If you try to add a duplicate element, the HashSet will ignore it and not add it again, ensuring all elements remain unique.

Are there any performance considerations I should be aware of?

Yes, HashSet offers average constant time performance for add, remove, and contains operations, but performance can degrade if many elements hash to the same bucket.