Java add elements to LinkedHashSet

/**
 * @author lautturi.com 
 * Java example: add new element to LinkedHashSet in java
 */

import java.util.*;

public class Lautturi {

	
	public static void main(String[] args) {

		LinkedHashSet<Integer> hashset = new LinkedHashSet<>();

        // Add elements to LinkedHashSet using add() method
		hashset.add(1);
		hashset.add(2);
		hashset.add(3);
        
        System.out.println("LinkedHashSet: " + hashset);

        LinkedHashSet<Integer> hashset2 = new LinkedHashSet<>();
        
        // Add elements to LinkedHashSet using addAll() method
        hashset2.addAll(hashset);
        hashset2.add(4);
        System.out.println("New LinkedHashSet: " + hashset2);
	}
}

output:

LinkedHashSet: [1, 2, 3]
New LinkedHashSet: [1, 2, 3, 4]