/* 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);
 
	}
}

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