Dates and Times

When compared with the new date/time API that was introduced with Java 8, what is an advantage of the old date/time API?

• It’s thread-safe.

• It’s intuitive.

• It’s easier to localize for parts of the world that don’t use the Gregorian calendar.

• It works with versions of Java prior to Java 8.

What package stores the LocalDateTime class?

• java.util

• java.text

• java.time

• java.date

Which of the following is true about a LocalDate object?

• It represents a date only.

• It works from the observer’s perspective.

• It represents a time only.

• Both a and b.

If the current time is 5pm, what is printed to the console? LocalTime now = LocalTime.now(); LocalTime startTime = LocalTime.of(15, 30); if (now.compareTo(startTime) < 0) { System.out.println("early"); } else if (now.compareTo(startTime) > 0) { System.out.println("late"); } else if (now.compareTo(startTime) == 0) { System.out.println("on time"); }

• early

• late

• on time

• nothing

Which of the following statements gets the month from a LocalDate object named now?

• int month = now.getMonth();

• int month = now.getMonthInt();

• Month month = now.getMonth();

• Month month = now.getMonthInt();

Given a LocalDate object named date, which of the following statements changes the day of the month to the 12th?

• LocalDate newDate = date.withDayOfMonth(12);

• LocalDate newDate = date.setDayOfMonth(12);

• LocalDate newDate = date.withDay(12);

• LocalDate newDate = date.setDay(12);

Given a LocalDateTime object named now that stores the current date and time, which of the following statements gets a new LocalDateTime object that’s four weeks in the future?

• LocalDateTime newDateTime = now.incrementWeeks(4);

• LocalDateTime newDateTime = now.addWeeks(4);

• LocalDateTime newDateTime = now.plusWeeks(4);

• LocalDateTime newDateTime = now.plus(WEEKS, 4);

What are the month and year for date2 after the statements that follow are executed? LocalDate date1 = LocalDate.of(1997, 12, 1); LocalDate date2 = date1.plusMonths(2);

• January 1997

• January 1998

• February 1997

• February 1998

Given LocalDate objects named checkInDate and checkOutDate, which of the following statements calculates the number of days between two dates?

• int numDays = ChronoUnit.DAYS.between(checkInDate, checkOutDate);

• long numDays = ChronoUnit.DAYS.between(checkInDate, checkOutDate);

• int numDays = checkInDate.between(checkOutDate, ChronoUnit.DAYS);

• long numDays = checkInDate.between(checkOutDate, ChronoUnit.DAYS);

What does the following code print to the console? LocalDate date = LocalDate.of(1976, Month.JANUARY, 1); DateTimeFormatter dtf = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM); System.out.println(dtf.format(date));

• 01/01/76

• 01/01/1976

• Jan 1, 1976

• 1976-01-01