OCA: Adding new StringBuilder + list.size( )

public class Test {
     public static void main(String[] args) {
         List<StringBuilder> days = new ArrayList<>();
         days.add(new StringBuilder("Sunday"));
         days.add(new StringBuilder("Monday"));
         days.add(new StringBuilder("Tuesday"));

         if(days.contains(new StringBuilder("Sunday"))) {
             days.add(new StringBuilder("Wednesday"));
         }

         System.out.println(days.size());
     }

//What is the output?

3