Java OCA OCP Practice Question 1831

Question

In the United States, daylight savings time ends on November 5th, 2017 at 02:00 a.m. and we repeat the previous hour. What is the output of the following? 

import java.time.*; 

public class Main { 


   public static void main(String[] args) { 
      LocalDate localDate = LocalDate.of(2017, Month.NOVEMBER, 5); 
      LocalTime localTime = LocalTime.of(1, 0); 
      ZoneId zone = ZoneId.of("America/New_York"); 
      ZonedDateTime z = ZonedDateTime.of(localDate, localTime, zone); 
      for (int i = 0; i < 6; i++) 
         z.plusHours(1); //from  w ww.j  a  va  2  s  .c om
      System.out.println(z.getHour()); 
   } 
}
  • A. 5
  • B. 6
  • C. 7
  • D. None of the above


D.

Note

This question is tricky.

It appears to be about daylight savings time.

However, the result of z.

plusHours(1) is never stored in a variable or used.

Since ZonedDateTime is immutable, the time remains at 01:00.

The code prints out 1, making none of these correct and Option D the answer.




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