Презентация 3. Essential Java Classes. 3a. Date and Time in Java SE8 онлайн

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Слайды и текст к этой презентации:

№1 слайд
. Essential Java Classes a.
Содержание слайда: 3. Essential Java Classes 3a. Date and Time in Java SE 8
№2 слайд
Some New Date and Time
Содержание слайда: Some New Date and Time Classes Package java.time LocalDate - a date without a time-zone in the ISO-8601 calendar system, such as 2007-12-03 LocalTime - a time without time-zone, such as 10:15:30 LocalDateTime - a date-time without a time-zone, such as 2007-12-03T10:15:30 Duration - a time-based amount of time, such as '34.5 seconds‘ Period - a date-based amount of time, such as '2 years, 3 months and 4 days‘
№3 слайд
Some Date Enums
Содержание слайда: Some Date Enums java.time.DayOfWeek - a day-of-week, such as 'Tuesday‘ java.time.Month – a month-of-year, such as 'July‘ java.time.temporal.ChronoField – a standard set of fields provide field-based access to manipulate a date, time or date-time java.time.temporal.ChronoUnit – a standard set of date periods units
№4 слайд
LocalDate Class Is an
Содержание слайда: LocalDate Class Is an immutable date-time object that represents a date, often viewed as year-month-day Other date fields, such as day-of-year, day-of-week and week-of-year, can also be accessed This class does not store or represent a time or time-zone The ISO-8601 calendar system is the modern civil calendar system used today in most of the world. It is equivalent to the Gregorian calendar system The LocalDate class doesn’t have a public constructor
№5 слайд
How to Create LocalDate now -
Содержание слайда: How to Create LocalDate now() - obtains the current date from the system clock in the default time-zone of(int year, int month, int dayOfMonth) -obtains an instance of LocalDate from a year, month and day of(int year, Month month, int dayOfMonth) - obtains an instance of LocalDate from a year, month and day
№6 слайд
Date Formatting format
Содержание слайда: Date Formatting format(DateTimeFormatter  formatter) method formats the date using the specified formatter Formatter can be created as follows DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd.MM.yyyy"); Details are here: http://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html
№7 слайд
Exercise Print current date,
Содержание слайда: Exercise Print current date, please
№8 слайд
Print Current Date See a
Содержание слайда: Print Current Date See 33a1CurrentDate project for the full text
№9 слайд
LocalDate Comparison Methods
Содержание слайда: LocalDate Comparison Methods compareTo(LocalDate other) - compares this date to another date equals(Object obj) - checks if this date is equal to another date isAfter(LocalDate other) - checks if this date is after the specified date isBefore(LocalDate other) - checks if this date is before the specified date
№10 слайд
LocalDate Check Length
Содержание слайда: LocalDate Check/Length Methods isLeapYear() - checks if the year is a leap year lengthOfMonth() - returns the length of the month represented by this date lengthOfYear() - returns the length of the year represented by this date
№11 слайд
LocalDate Plus Methods
Содержание слайда: LocalDate Plus Methods plusDays(long daysToAdd) - returns a copy of this LocalDate with the specified number of days added plusMonths(long monthsToAdd) - adds the specified period in months plusWeeks(long weeksToAdd) - adds the specified period in weeks plusYears(long yearsToAdd) – adds the specified period in years
№12 слайд
Exercise Print the following
Содержание слайда: Exercise Print the following: Current date Date in 6 weeks Date 4 month before Date in 45 days
№13 слайд
Date Manipulations See a
Содержание слайда: Date Manipulations See 33a2DateManipulations project for the full text
№14 слайд
Get Field of a Date of get
Содержание слайда: Get Field of a Date (1 of 2) get(ChronoField field) - gets the value of the specified field from this date as an int ChronoField enum is a standard set of date fields: DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_YEAR, HOUR_OF_DAY, MONTH_OF_YEAR, YEAR, SECOND_OF_DAY etc. See for details: http://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoField.html
№15 слайд
Get Field of a Date of
Содержание слайда: Get Field of a Date (2 of 2) getDayOfWeek() - gets the day-of-week field, which is an enum DayOfWeek (MONDAY, TUESDAY, WEDNESDAY etc.) getDayOfMonth() - gets the day-of-month field getDayOfYear() - gets the day-of-year field getMonth() - gets the month-of-year field using the Month enum (JANUARY, FEBRUARY, etc.)
№16 слайд
Exercise Create a method that
Содержание слайда: Exercise Create a method that gets some date and returns next bank day
№17 слайд
Exercise See a NextBankDate
Содержание слайда: Exercise See 33a3NextBankDate project for the full text
№18 слайд
Some Other LocalDate Methods
Содержание слайда: Some Other LocalDate Methods until(LocalDate endDate, ChronoUnit unit) - calculates the amount of time until endDate in terms of the specified unit withDayOfMonth(int dayOfMonth) - returns a copy of this date with the day-of-month altered withMonth(int month) - returns a copy of this date with the month-of-year altered withYear(int year) - returns a copy of this date with the year altered
№19 слайд
Home Tasks How old are you in
Содержание слайда: Home Tasks How old are you in days and months? What day of week is your birthday? Calculate Orthodox Easter and Trinity dates for the current decade http://ru.wikipedia.org/wiki/%D0%90%D0%BB%D0%B3%D0%BE%D1%80%D0%B8%D1%82%D0%BC_%D0%93%D0%B0%D1%83%D1%81%D1%81%D0%B0_%D0%B2%D1%8B%D1%87%D0%B8%D1%81%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F_%D0%B4%D0%B0%D1%82%D1%8B_%D0%9F%D0%B0%D1%81%D1%85%D0%B8
№20 слайд
LocalDateTime Class
Содержание слайда: LocalDateTime Class LocalDateTime is an immutable date-time object that represents a date-time, often viewed as year-month-day-hour-minute-second Time is represented to nanosecond precision It is a description of the date, as used for birthdays, combined with the local time as seen on a wall clock It cannot represent an instant on the time-line without additional information such as an offset or time-zone
№21 слайд
LocalDateTime Methods I now
Содержание слайда: LocalDateTime Methods I now() compareTo(), equals(), isAfter(), isBefore() plusDays(), plusMonths(), plusWeeks(), plusYears() plusHours(), plusMinutes(), plusSeconds() get(ChronoField field), getDayOfWeek(), getDayOfMonth(), getDayOfYear(), getMonth() getHour(), getMinute(), getSecond()
№22 слайд
LocalDateTime Methods II of
Содержание слайда: LocalDateTime Methods II of(int year, int month, int dayOfMonth, int hour, int minute, int second) - obtains an instance of LocalDateTime from year, month, day, hour, minute and second, setting the nanosecond to zero format(DateTimeFormatter  formatter) - formats this date-time using the specified formatter
№23 слайд
Print Current Date and Time
Содержание слайда: Print Current Date and Time public static void main(String[] args){ LocalDateTime currDateTime = LocalDateTime.now(); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss"); String txt = currDateTime.format(formatter); System.out.println("Current date and time:" + txt); } See 33a6CurrentDateTime project for the full text
№24 слайд
Converting from
Содержание слайда: Converting from java.util.Date Convert java.util.Date to java.time.LocalDateTime: Date ts = new Date(); Instant instant = Instant.ofEpochMilli(ts.getTime()); LocalDateTime res = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()); Convert java.util.Date to java.time.LocalDate: Date date = new Date(); Instant instant = Instant.ofEpochMilli(date.getTime()); LocalDate res = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate();
№25 слайд
Converting to java.util.Date
Содержание слайда: Converting to java.util.Date Convert java.time.LocalDateTime to java.util.Date: LocalDateTime ldt = LocalDateTime.now(); Instant instant = ldt.atZone(ZoneId.systemDefault()).toInstant(); Date res = Date.from(instant); Convert java.time.LocalDate to java.util.Date: LocalDate ld = LocalDate.now();; Instant instant = ld.atStartOfDay(). atZone(ZoneId.systemDefault()).toInstant(); Date res = Date.from(instant);
№26 слайд
Manuals http docs.oracle.com
Содержание слайда: Manuals http://docs.oracle.com/javase/tutorial/datetime/index.html
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