SCJP Module-9 Question-28

The Sample program given below will test your understanding about the NavigableSet set in the Collection framework of Java.

The Sample program given below will test your understanding about the NavigableSet set in the Collection framework of Java.

Given below the sample code :

1 import java.util.ArrayList;
2 import java.util.List;
3 import java.util.NavigableSet;
4 import java.util.TreeSet;
5 public class Check {
6 public static void main(String... args) {
7 List<Integer> l = new ArrayList<Integer>();
8 lst.add(12);
9 lst.add(6);
10 lst.add(2);
11 lst.add(3);
12 lst.add(30);
13 lst.add(21);
14 NavigableSet<Integer> nset = newTreeSet(l);
15 // Place code here
16 }

What code line should be at line 15 to print all the element less than 12 in the given array list ?

1. System.out.println( nset.higher(12));

2. System.out.println( nset.lower(12));

3.System.out.println(nset.headSet(12));

4.No need to add any line.