/* 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
	{
Map< DayOfWeek , String > dailyAssignment = new EnumMap<>( DayOfWeek.class ) ;
dailyAssignment.put( DayOfWeek.MONDAY, "Alice" ) ;
dailyAssignment.put( DayOfWeek.TUESDAY, "Bob" ) ;
dailyAssignment.put( DayOfWeek.SATURDAY, "Bob" ) ;
dailyAssignment.put( DayOfWeek.SUNDAY, "Carol" ) ;
 
List< DayOfWeek > weekend = List.of( DayOfWeek.SATURDAY , DayOfWeek.SUNDAY ) ;
 
Map< DayOfWeek , String > weekendAssignment = new EnumMap<>( dailyAssignment ) ;
weekendAssignment.keySet().retainAll( weekend ) ;
 
System.out.println( "dailyAssignment.toString(): " + dailyAssignment ) ;
System.out.println( "weekendAssignment.toString(): " + weekendAssignment ) ;
	}
}

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