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OCPJP 6 Mock Exams - NavigableSet (14 Questions)

4) What will be the output of the following program?

package navset;

import java.util.TreeSet;

public class Ques02 {

	public static void main(String[] args) {
		
		MyNavigableSet objects = new MyNavigableSet();
		objects.add(new Object());
		System.out.println(objects);
	}
}


class MyNavigableSet extends TreeSet<String>{

	public boolean add(Object value){
		return super.add(value);
	}
}

1. The program will compile and run fine to print the contents of the set.
2. The program will raise a run-time exception telling that it is not possible to add objects of type 'java.lang.Object' in place of 'java.lang.String'.
3. The program will raise a compile-time error.

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Answer

4) c.

A compile-time error telling that a name-clash has happened for the overridden method taking Object as argument.

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