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What is the output for the below code?

import java.util.Iterator;
import java.util.TreeSet;
public class Test {
public static void main(String... args) {
TreeSet s1 = new TreeSet();
s1.add("one");
s1.add("two");
s1.add("three");
s1.add("one");
Iterator it = s1.iterator();
while (it.hasNext() ) {
System.out.print( it.next() + " " );
}
}
}

A.	one three two	B.	Runtime Exception
C.	one three two one	D.	one two three

Answer and Explanation

Answer:one three two

Explanation:
The TreeSet assures no duplicate entries. It will return elements in natural order, which for Strings mean alphabetical order.

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