package devmanuals.com;

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

public class CNMHeadMap {
	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");
		cnm.put(5,"E");
		cnm.put(6,"F");
		System.out.println("Mappings = "+cnm);
		System.out.println("Set of keys = "+cnm.keySet());
		System.out.println("First entry of the map : "+cnm.firstEntry());
		System.out.println("Last entry of the map : "+cnm.lastEntry());
		cnm=cnm.headMap(5);
		System.out.println("Top elements of map less than key '5' = "+cnm);
		System.out.println("Size of map = "+cnm.size());
		for(int i=0; i<=6;i++){
			cnm.remove(3);
		}
		System.out.println("Remaining mappings of the map = "+cnm);
		cnm.putIfAbsent(3,"G");
		System.out.println("Mapping after adding new element= "+cnm);
	}
}