How do I implement a HashSet in Java?

How do I implement a HashSet in Java?

To implement a HashSet in Java, you can use the built-in HashSet class from the java.util package. Here's a simple 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("Cherry");

        System.out.println(set);
    }
}

What are the advantages of using a HashSet?

HashSet offers constant time performance for basic operations like add, remove, and contains, making it very efficient.

Can I store duplicate values in a HashSet?

No, HashSet does not allow duplicate values. If you try to add a duplicate, it will simply be ignored.

How does HashSet handle collisions?

HashSet uses a hash table to store elements. When a collision occurs, it uses a linked list or tree structure to store multiple elements at the same index.