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SCJP Module-9 Question-7

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The given sample program will test your understanding of NavigableSet, newTreeSet of Collection framework of Java

Given below the sample code :

import java.util.ArrayList;
import java.util.List;
import java.util.NavigableSet;
import java.util.TreeSet;
public class Check {
public static void main(String... args) {
List<Integer> l = new ArrayList<Integer>();
lst.add(12);
lst.add(6);
lst.add(2);
lst.add(3);
lst.add(30);
lst.add(21);
NavigableSet<Integer> nset = newTreeSet(l);
System.out.println(nset.lower(4)+" "+nset.higher(4)+ " "+ nset.lower(2));
}
}

What will be the output of the above code?

1.Compile error

2. 3  6  null

3. null 6 12

4. null 6 null

Answer

(2)

Explanation

lower() It returns the largest element in this set strictly less than the provided element,
or null if there is no such element.
higher() It returns the lowest element in this set strictly greater than the provided element,
or null if there is no such element.

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