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3. Essential Java Classes 3. Date and Time презентация
Содержание
- 1. 3. Essential Java Classes 3. Date and Time
- 2. Date and Time Classes Date - represents
- 3. Class Date represents a specific instant in
- 4. Some Date methods equals(Object obj) - compares
- 5. Class Calendar Abstract class that provides methods
- 6. Calendar Methods Calendar rightNow = Calendar.getInstance(); -
- 7. Class GregorianCalendar Concrete subclass of Calendar
- 8. Calendar Examples Задание даты: GregorianCalendar calendar =
- 9. Date & Calendar Transformations Calendar c =
- 10. Class SimpleDateFormat is a concrete class for
- 11. SimpleDateFormat Example SimpleDateFormat dtFrm = new
- 12. Class Locale represents a specific geographical, political,
- 13. Класс SimpleTimeZone A concrete subclass of TimeZone
- 14. SimpleDateFormat Localization SimpleDateFormat dtFrmL = new
- 15. DateFormat Localization DateFormat dtFrmD = DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.ENGLISH);
- 16. Date Localization http://docs.oracle.com/javase/tutorial/i18n/format/dateFormat.html * Infopulse Training Center
- 17. Exercise 3.3.1 Print the following: Current date
- 18. Exercise 3.3.1 See 331DateActions project for the full text * Infopulse Training Center
- 19. Exercise 3.3.2. Create a static method
- 20. Exercise 3.3.2. See 332NextBankDay project for full text * Infopulse Training Center
- 21. Exercise 3.3.3. Create a method that gets
Date and Time Classes Date - represents a specific instant in time, with millisecond precision GregorianCalendar (concrete subclass of Calendar) – date and time manipulations SimpleDateFormat- formatting and parsing dates
Слайд 2Date and Time Classes
Date - represents a specific instant in time,
with millisecond precision
GregorianCalendar (concrete subclass of Calendar) – date and time manipulations
SimpleDateFormat- formatting and parsing dates in a locale-sensitive manner
Locale - represents a specific geographical, political, or cultural region
SimpleTimeZone(concrete subclass of TimeZone) - represents a time zone for use with a Gregorian calendar
GregorianCalendar (concrete subclass of Calendar) – date and time manipulations
SimpleDateFormat- formatting and parsing dates in a locale-sensitive manner
Locale - represents a specific geographical, political, or cultural region
SimpleTimeZone(concrete subclass of TimeZone) - represents a time zone for use with a Gregorian calendar
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Слайд 3Class Date
represents a specific instant in time, with millisecond precision
new Date()
returns current date and time
Date saves the milliseconds since January 1, 1970, 00:00:00
Date does not localized. Most of it methods are deprecated.
Calendar class allows to process dates
Date saves the milliseconds since January 1, 1970, 00:00:00
Date does not localized. Most of it methods are deprecated.
Calendar class allows to process dates
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Слайд 4Some Date methods
equals(Object obj) - compares dates
after(Date date) - compares dates
before(Date
date) - compares dates
getTime() – returns milliseconds since 01.01.1970
setTime() – sets date and time
See http://docs.oracle.com/javase/7/docs/api/java/util/Date.html for details
getTime() – returns milliseconds since 01.01.1970
setTime() – sets date and time
See http://docs.oracle.com/javase/7/docs/api/java/util/Date.html for details
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Слайд 5Class Calendar
Abstract class that provides methods for converting between a specific
instant in time and a set of calendar fields
Some calendar fields: YEAR, MONTH, DATE, DAY_OF_WEEK, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND
Some calendar fields: YEAR, MONTH, DATE, DAY_OF_WEEK, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND
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Слайд 6Calendar Methods
Calendar rightNow = Calendar.getInstance(); - gets current date and time
set(int
field, int value) – sets calendar field value (then one of get (), getTime(), add(), roll() methods is needed)
add(int field, int amount) – adds given amount to the field
get(int field) – gets a given field value
See http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html for details
add(int field, int amount) – adds given amount to the field
get(int field) – gets a given field value
See http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html for details
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Слайд 7Class GregorianCalendar
Concrete subclass of Calendar
Provides the standard calendar system used
by most of the world.
Use GregorianCalendar for date and time manipulations
See http://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html for details
Use GregorianCalendar for date and time manipulations
See http://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html for details
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Слайд 8Calendar Examples
Задание даты:
GregorianCalendar calendar = new GregorianCalendar(2012, Calendar.May, 14);
Добавление к дате
двух недель:
calendar.add(Calendar.WEEK_OF_YEAR, 2);
Изменение полей даты:
calendar.set(Calendar.DAY_OF_MONTH, 10);
calendar.set(Calendar.MONTH, Calendar.SEPTEMBER);
System.out.println(dtFrm.format(calendar.getTime()));
calendar.add(Calendar.WEEK_OF_YEAR, 2);
Изменение полей даты:
calendar.set(Calendar.DAY_OF_MONTH, 10);
calendar.set(Calendar.MONTH, Calendar.SEPTEMBER);
System.out.println(dtFrm.format(calendar.getTime()));
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Слайд 9Date & Calendar Transformations
Calendar c = Calendar.getInstance();
Date dt = new Date();
Calendar
-> Date
dt = c.getTime();
Date -> Calendar
c.setTime(dt);
dt = c.getTime();
Date -> Calendar
c.setTime(dt);
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Слайд 10Class SimpleDateFormat
is a concrete class for formatting and parsing dates in
a locale-sensitive manner
It allows for:
formatting (date -> text)
parsing (text -> date)
See http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html for details
It allows for:
formatting (date -> text)
parsing (text -> date)
See http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html for details
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Слайд 11SimpleDateFormat Example
SimpleDateFormat dtFrm =
new SimpleDateFormat("dd.MM.yyyy");
Date start = new Date();
String
txDate = dtFrm.format(start);
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Слайд 12Class Locale
represents a specific geographical, political, or cultural region
Locale lc =
new Locale(”uk”, ”UK”);
Locale.getDefault() - gets the current value of the default locale
See http://docs.oracle.com/javase/7/docs/api/java/util/Locale.html for details
Locale.getDefault() - gets the current value of the default locale
See http://docs.oracle.com/javase/7/docs/api/java/util/Locale.html for details
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Слайд 13Класс SimpleTimeZone
A concrete subclass of TimeZone class that represents a time
zone for use with a Gregorian calendar
Can specify the year when the daylight saving time schedule starts or ends.
See http://docs.oracle.com/javase/7/docs/api/java/util/SimpleTimeZone.html for details
Can specify the year when the daylight saving time schedule starts or ends.
See http://docs.oracle.com/javase/7/docs/api/java/util/SimpleTimeZone.html for details
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Слайд 14SimpleDateFormat Localization
SimpleDateFormat dtFrmL = new
SimpleDateFormat("dd.MMMM.yyyy",
Locale.ENGLISH);
Date dt = new Date();
System.out.println("Locale.ENGLISH: " + dtFrmL.format(dt));
Locale.ENGLISH: 05.October.2013
Locale.GERMAN: 05.Oktober.2013
Locale.FRANCE: 05.octobre.2013
Locale.ITALIAN: 05.ottobre.2013
Locale("ua", "ua"): 05.October.2013
Locale("ru", "ru"): 05.Октябрь.2013
Date dt = new Date();
System.out.println("Locale.ENGLISH: " + dtFrmL.format(dt));
Locale.ENGLISH: 05.October.2013
Locale.GERMAN: 05.Oktober.2013
Locale.FRANCE: 05.octobre.2013
Locale.ITALIAN: 05.ottobre.2013
Locale("ua", "ua"): 05.October.2013
Locale("ru", "ru"): 05.Октябрь.2013
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Слайд 15DateFormat Localization
DateFormat dtFrmD = DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.ENGLISH);
System.out.println("Locale.ENGLISH: " + dtFrmD.format(dt));
Locale.ENGLISH: Oct 5,
2013
Locale.GERMAN: 05.10.2013
Locale.FRANCE: 5 oct. 2013
Locale.ITALIAN: 5-ott-2013
Locale("ua", "ua"): Saturday, October 5, 2013
Locale("ru", "ru"): 5 Октябрь 2013 г.
Locale.GERMAN: 05.10.2013
Locale.FRANCE: 5 oct. 2013
Locale.ITALIAN: 5-ott-2013
Locale("ua", "ua"): Saturday, October 5, 2013
Locale("ru", "ru"): 5 Октябрь 2013 г.
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Слайд 16Date Localization
http://docs.oracle.com/javase/tutorial/i18n/format/dateFormat.html
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Слайд 17Exercise 3.3.1
Print the following:
Current date
Date in 6 weeks
Date 4 month
before
Date in 45 days
Date in 45 days
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Слайд 19Exercise 3.3.2.
Create a static method that gets some date and
returns next bank day
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Слайд 21Exercise 3.3.3.
Create a method that gets two dates and returns number
of days between these dates (general idea only!!!).
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