Chapter 5: Dates Strings, and Localization

Question 1

What is the GMT of 2015-06-20T07:50+02:00[Europe/Paris]?

Answer 1

GMT 2015-06-20 5:50

Question 2

How to get an instance of LocalDate?

Answer 2

LocalDate ld = LocalDate.of(year, month, day)

Question 3

How to get an instance of LocalTime?

Answer 3

LocalTime lt = LocalTime.of(hour, minute,second)

Question 4

How to get an instance of LocalDateTime?

Answer 4

LocalDateTime ldt = LocalDateTime.of(year, month, day, hour, minute, second)

or

LocalDateTime ldt = LocalDateTime.of(localdate, localtime)

Question 5

How to get an instance of ZonedDateTime

Answer 5

ZonedDateTime.of(int year, int month,
int dayOfMonth, int hour, int minute, int second, int nanos, ZoneId zone)
or
ZonedDateTime.of(LocalDate date, LocalTime time, ZoneId zone)

or

ZonedDateTime.of(LocalDateTime dateTime, ZoneId zone)

Question 6

Enumarate the ways to set a instantiate a period

Answer 6

Period.ofDays(), Period.ofWeeks(), Period.ofMonths(), Period.ofYears(), Period.of(year, month, day)

Question 7

Printing Period objects, what is the output of Period.ofMonths(3)

Answer 7

P3M

Question 8

Enumerate the ways to get an instance of Duration

Answer 8

Duration.ofDays(), Duration.ofHours(), Duration.ofMinutes, Duration.ofSeconds, Duration.ofMillis(), Duration.ofNanos()

Question 9

How to add period to a LocalDate object ld?

Answer 9

ld.plus(Period p).

Question 10

A class that represents a specific moment in time in the GMT timezone.

Answer 10

Instant now = Instant.now()

Question 11

Generate a Locale for German and Germany

Answer 11

Locale l = Locale.GERMANY;
Locale l = new Locale("de");
Locale l = new Locale("de", "DE");
Locale l = new Locale.Builder().setLanguage("de").setRegion("DE").build();

Question 12

Instantiate a ResourceBundle

Answer 12

ResourceBundle rb = ResourceBundle.getBundle(“resourcename”, locale)

Question 13

ResourceBundle.getBundle(“Zoo”, Locale.French”), How many resources will be searched?

Answer 13

Zoo_fr.java
Zoo_fr.properties
Zoo_en.java
Zoo_en.properties
Zoo.java
Zoo.properties

Question 14

How get an instance of NumberFormat?

Answer 14

NumberFormat.getInstance();
NumberFormat.getInstance(Locale.US);
NumberFormat.getCurrencyInstance();
NumberFormat.getPercentInstance();

Question 15

Number format method to convert a number to String

Answer 15

NumberFormat.format()

Question 16

NumberFormat method to convert String to Number

Answer 16

NumberFormat.parse();

Question 17

What is the output of
NumberFormat fr = NumberFormat.getInstance(Locale.FRANCE);
String s = “40.45”;
System.out.println(fr.parse(s));

Answer 17

40

Question 18

Exception thrown by NumberFormat when the text is unparseable?

Answer 18

ParseException

Question 19

What is the return type of parse?

Answer 19

Number object

Question 20

How to format LocalDate object?

Answer 20

LocalDate ld = LocalDate.now();

ld.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);

Question 21

Enumerate the ofLocalized methods of DateFormatter

Answer 21

DateFormatter.ofLocalizedTime(FormatStyle.SHORT);
DateFormatter.ofLocalizedDate(FormatStyle.SHORT)
DateFormatter.ofLocalizedDateTime(FormatStyle.SHORT)