Inserting into a non generic TreeSet in java Yasser @Jobilize.com

Author: Yasser Ibrahim

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Question 211 / 297: What is the result of compiling and running the following code?

import java.util.*;

public class Test {

	public static void main(String[] args) {
		TreeSet s = new TreeSet();
		s.add(1);
		s.add(99.9);
		s.add(99.9);
		s.add(96.9);

		for (int i = 0; i < s.size(); i++) {
			System.out.print(s.pollFirst()+" ");

		}

	}
}

A 1 96.9 99.9

B 1 96.9 99.9 99.9

C 1

D compilation error

E an exception is thrown at run time

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Explanation:

The compiler will not complain, since TreeSet "s" is a non generic collection , any type is allowed to be inserted. TreeSet sorts its objects while inserting as long they are comparable to each other but since they are not, a ClassCastException is thrown at run time.

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