Date, Time & Locale

Question 1

Pkg a tridy pro date a time
Vlastnosti (2)

Answer 1

java.time
LocalDate
LocalTime
LocalDateTime

immutable, thread safe

Question 2

Datumovo casove metody porovnavani (2)

Answer 2

dt.isBefore(), dt.isAfter()

Question 3

Datumovo casove metody vytvareni - ted; konkretni datum

Answer 3

LocalDate.now()
LocalDate.of(2023, 12, 31)

Question 4

Datumovo casove metody zmeny/ziskani minuty, hodiny, dne v mesici, … (4)

Answer 4

hours, secords, daysOfMonth, …:
dt.withXXX(), dt.getXXX()
dt.plusXXX(), dt.minusXXX()

Question 5

LocalDateTime
- z date a time (2)
- na date, na time

Answer 5

LocalDateTime.of(date, time)
date.atTime(time)
ldt.toLocalDate()
ldt.toLocalTime()

Question 6

Konstanty: leden

Answer 6

Month.JANUARY

Question 7

Tridy pro:
casove rozmezi v nanosekundach
casove rozmezi v jednotkach
casove razitko

Answer 7

Duration - pro logy
Period - pro aplikace
Instant

Question 8

Duration - metody porovnani

Answer 8

Duration.between(x, y)
Duration.isNegative(x)

Question 9

Duration - prevod z minut a na minuty

Answer 9

Duration.ofMinutes(x)
duration.toMinutes()

Question 10

Vytvoreni datumu se zonou
Zona:
Londyn
GMT + 5
systemova

Answer 10

ZonedDateTime.of(date, zoneId)
ZoneId.of(“Europe/London”)
ZoneId.of(“GMT+5”)
ZoneId.getSystemDefault()

Question 11

Prevedeni datumu se zonou na jinou zonu
Ziskej offset oproti greenwichi

Answer 11

zonedDateTime.withZoneSameInstant(zoneId)
zonedDateTime.getOffset()

Question 12

Lokale : pro Velkou Britanii - s librami vs s eurem
pro francouzsky langugage tag
pro francii konstantou
systemove

Answer 12

new Locale(“en”, “GB”)
new Locale(“en”, “GB”, “EURO”)
Locale.forLanguageTag(“fr-FR”)
Locale.FRANCE
Locale.getDefault()

Question 13

Tvorba formatovace pro menu, pro procenta, pro cisla, pro cisla zkracena (napr 1000 = 1 k)
Co je vzdy parametrem?

Answer 13

NumberFormat.getCurrencyInstance()
NumberFormat.getPercentInstance() - zahazuje desetinky
NumberFormat.getNumberInstance()
NumberFormat.getCompactNumberInstance(locale, Style.SHORT)
locale

Question 14

Prevod cisla na formatovany text
Prevod formatovaneho textu na cislo + co vraci

Answer 14

numberFormat.format(x)
numberFormat.parse(s) - vraci Wrapper class

Question 15

Datum na String: trida, patterny pro: rok, mesic, den, den v tydnu
Escapovani patternu <rok> je rok, mesic je <mesic></mesic></rok>

Answer 15

DateTimeFormatter
yyyy,MM,dd,EEEE
“yyyy’ je rok, mesic je ‘MM”

Question 16

DateTimeFormatter - typy formatovani

Answer 16

FormatStyle.SHORT, MEDIUM, LONG, FULL

Question 17

DateTimeFormatter - vytvor pro pattern a pro datum(2)

Answer 17

DTF.ofPattern(pattern, locale)
DTF.ofLocalizedDateTime(formatStyle, locale)
DTF.ofLocalizedDate(formatStyle).localizedBy(locale)

Question 18

Metody prevodu Stringu na datum a datumu na String

Answer 18

LocalDate.parse(“date”, dateTimeFormatter)
date.format(dateTimeFormatter)

Question 19

Resource bundle - filename, filename pro locale en,GB
Kdy se pouzije ten bez locale

Answer 19

name.properties
name_en_GB.properties
default se pouzije, pokud nezadam locale, nebo klic neni v lokalizovanem bundlu

Question 20

Radek resource bundlu pro pattern, ktery je <X> loves <Y>
Jak se rika takovym parametrum</Y></X>

Answer 20

pattern={0} loves {1}
substitution parameters

Question 21

Otevri resource bundle resources/names/name_en_GB.properties
a ziskej hodnotu klice pattern

Answer 21

RB b = ResourceBundle.getBundle(resources.names.name, new Locale(“en”, “GB”))
b.getString(“pattern”);

Question 22

Alternativni trida k ResourceBundle, v cem se lisi

Answer 22

Properties, muze cist z ruznych zdroju

Question 23

Prevedeni patternu se substitution params na String

Answer 23

MessageFormat.format(“{0} loves {1}”, person0, person1);

Question 24

Jak ziskam z datumu
- cislo mesice
- enum mesice

Answer 24

localDate.getMonthValue()
localDate.getMonth()

Question 25

Jake cislo ma Calendar.APRIL konstanta?
Jake cislo ma duben v LocalDate?

Answer 25

4
3 (LocalDate pocita od 0)