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JAVA Programming :: Threads

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3. What is the output for the bellow code?

import javutil.Iterator;
import javutil.Set;
import javutil.TreeSet;
public class Test {
public static void main(String... args) {
Set s = new TreeSet();
s.add("7");
s.add(9);
Iterator itr = s.iterator();
while (itr.hasNext())
System.out.print(itr.next() + " ");
}
}

Answer: Option B

Explanation :

Without generics, the compiler does not know what type is appropriate for this TreeSet, so it allows everything to compile. But at runtime he TreeSet will try to sort the elements as they are added, and when it tries to compare an Integer with a String it will throw a ClassCastException. Exception in thread "main" javlang.ClassCastException: javlang.String cannot be cast to javlang.Integer.

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