package devmanuals.com;

import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.NavigableSet;

public class CNMKeySet {
	public static void main (String args[]){
		ConcurrentNavigableMap<Integer,String> cnm = 
						new ConcurrentSkipListMap<Integer,String>();
		cnm.put(1,"A");
		cnm.put(2,"B");
		cnm.put(3,"C");
		cnm.put(4,"D");
		System.out.println("Mappings = "+cnm);
		System.out.println("Size of mappings = "+cnm.size());
		NavigableSet<Integer> ns = cnm.keySet();
		System.out.println("Set of keys = "+ns);
		System.out.println("First entry of the map = "+cnm.firstEntry());
		System.out.println("Last entry of the map = "+cnm.lastEntry());
	}

}