Program: How to add another collection to LinkedHashSet?

Below example shows how to add all elements from another collection to LinkedHashSet object. By using addAll() method, we can add all elements from another collection object.

package com.java2novice.linkedhashset;

import java.util.HashSet;
import java.util.LinkedHashSet;

public class MyLhsAddAllEx {

	public static void main(String a[]){
		
		LinkedHashSet<String> lhs = new LinkedHashSet<String>();
		//add elements to HashSet
		lhs.add("first");
		lhs.add("second");
		lhs.add("third");
		System.out.println(lhs);
		HashSet<String> subSet = new HashSet<String>();
		subSet.add("s1");
		subSet.add("s2");
		lhs.addAll(subSet);
		System.out.println("LinkedHashSet content after adding another collection:");
		System.out.println(lhs);
	}
}

[first, second, third]
LinkedHashSet content after adding another collection:
[first, second, third, s2, s1]