Online Java Compiler By
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import java.util.*; class TestCollection11{ public static void main(String args[]){ TreeSet
al=new TreeSet
(); al.add("Ravi"); al.add("Vijay"); al.add("Ravi"); al.add("Ajay"); Iterator
itr=al.iterator(); while(itr.hasNext()){ System.out.println(itr.next()); } } }
Output