/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

import java.time.* ;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{

		Set< Month > months = EnumSet.of( Month.MARCH , Month.MAY , Month.JUNE ) ;         
		Map< Month , String > myMap = 
		        months.stream()
		              .collect(
		              	  HashMap::new , 
		              	  ( map , val )-> map.put( val , null ) , 
		              	  HashMap::putAll
		              );
		              
		System.out.println(myMap);

	}
}