Adding all element of set2 to Set1 using addAll() method

import java.util.Iterator;

import java.util.TreeSet;

import java.util.Set;

public class TreeSetAddAll {

public static void main(String[] args) {

// creating our TreeSet

Set<String> ts = new TreeSet<>();

// adding element to our set

// insertion order is not maintained here

ts.add("Neha");

ts.add("Nisha");

ts.add("Nishu");

ts.add("Rekha");

ts.add("Madhu");

ts.add("Disha");

ts.add("Tara");

ts.add("Tara"); // duplicate element can't be added

// creating another TreeSet

Set<String> ts1 = new TreeSet<>();

ts1.add("Reena");

ts1.add("Sweety");

ts1.add("Sheetal");

// Adding all elements of ts to ts1

System.out.println("After invoking addAll() method");

ts.addAll(ts1);

System.out.println(ts);

}

}