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Simple Example of TreeSet class in Java .

import java.util.*;

class Test4{

public static void main(String args[]){

TreeSet ts=new TreeSet();

ts.add("Hello");

ts.add("My");

ts.add("Java");

ts.add("Hello");

Iterator itr=ts.iterator();

while(itr.hasNext()){

System.out.println(itr.next());

} } }

Output: Hello
               Java
               My