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This article introduces the knowledge of "the concrete use of java Calendar date abstract class". Many people will encounter such a dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

An abstract class cannot new directly. Its instance object GregorianCalendar () is required.

The c.get () method is required to get the Calendar abstract class properties:

Int year=c.get (Calendar.YEAR)

Set the date manually:

Calendar c=new GregorianCalendar ('2000, 11, 11, 11, 11, 20, 20, 20, and 20)

Int year=c.get (Calendar.YEAR); / / return year

Int week=c.get (calendar.DAY_OF_WEEK) / / return what day of the week

No parameter settings:

Calendar it=new GregorianCalendar ()

Int year=it.get (Calendar.YEAR); / / returns the current year

Addition of dates:

It.add (Calendar.X,N); / / No return value

Calendar it = new GregorianCalendar (); it.add (Calendar.DATE,2); / / the addition operation of the date (sign), it.add (Calendar.DATE,-2) for the next two days; / / the subtraction operation of the date, two days before, the second parameter adds the minus sign System.out.println (it.get (Calendar.DATE))

Date class and time class convert to each other:

Calendar c=new GregorianCalendar ()

Date d=c.getTime () / / date class is converted to time class

C.setTime (new Date ()); / / convert time class to date class

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