SCJP Module-9 Question-3

The Sample program given below will check your knowledge of Collection framework in Java.

The Sample program given below will check your knowledge of Collection framework in Java.

Given below the sample code :

import java.util.NavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
public class CheckSize {
public static void main(String... args) {
NavigableMap <Integer, String>nM = new ConcurrentSkipListMap<Integer, String>();
nM.put(4, "Wednesday");
nM.put(5, "Thursday");
nM.put(6, "Friday");
nM.put(1, "Sunday");
nM.put(2, "Monday");
nM.put(3, "Tuesday");
nM.pollFirstEntry();
nM.pollLastEntry();
nM.pollFirstEntry();
nM.pollLastEntry();
System.out.println(nM.size());
}
}