4.b:4.a:write a program to demonstrate the method of set interface java ?

 import java.util.HashSet;

import java.util.Set;

public class SetDemo {

    public static void main(String[] args) {

        // Create a HashSet of integers

        Set<Integer> numbers = new HashSet<>();

        // Add elements to the set

        numbers.add(10);

        numbers.add(5);

        numbers.add(8);

        numbers.add(5); // Duplicate element (will not be added)

        // Print the set

        System.out.println("Numbers Set: " + numbers);

        // Checking if an element exists

        boolean containsEight = numbers.contains(8);

        System.out.println("Contains 8? " + containsEight);

        // Removing an element

        numbers.remove(5);

        System.out.println("Updated Numbers Set: " + numbers);

        // Getting the size of the set

        int size = numbers.size();

        System.out.println("Size of Numbers Set: " + size);

        // Iterating over the set

        System.out.println("Iterating over Numbers Set:");

        for (Integer number : numbers) {

            System.out.println(number);

        }

        // Clearing the set

        numbers.clear();

        System.out.println("Cleared Numbers Set: " + numbers);

    }

}