/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
import java.util.stream.* ;
import java.time.temporal.* ;
 
/* 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
	{
 
List< LocalDate > firstSundayOfEachMonthInYear =
    Stream.of( Month.values() )
    .map( month -> 
        Year
        .of( 2021 )
        .atMonth( month )
        .atDay( 1 )
        .with( 
            TemporalAdjusters.firstInMonth( DayOfWeek.SUNDAY )
         ) 
    )
    .collect( Collectors.toList() ) 
;
 
System.out.println( firstSundayOfEachMonthInYear ) ;
 
	}
}

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