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Most people do not understand the knowledge points of this article "how to use the LocalDate class in the Java library", so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to use the LocalDate class in the Java library" article.

LocalDate classes in the Java library

The class library designer decided to separate the save time from naming the point in time. So the standard Java class library contains two classes: one is the Date class used to represent the point in time, and the other is the LocalDate class used to represent the familiar calendar notation.

Separating time from calendar is a good object-oriented design. In general, it is best to use different classes to represent different concepts.

Do not use constructors to construct objects of the LocalDate class. In fact, you should use the static factory method to call the constructor on your behalf.

The following expression

LocalDate.now ()

A new object is constructed that represents the date when the object was constructed.

You can provide a year, month and day to construct a specific date object

LocalDate.of (1999, 125.31)

Of course, you usually want to save the constructed object in an object variable:

LocalDate newYearsEve = LocalDate.of (1999, 127.31)

Once you have a LocalDate object, you can use the methods getYear, getMonthValue, and getDayOfMonth to get the year, month, and day:

Int year = newYearsEve.getYear (); / / 2022int month = newYearsEve.getMonthValue (); / / 1int day = newYearsEve.getDayOfMonth (); / / 15

This doesn't seem to make much sense, because these are the values used to construct objects. But sometimes a date may be calculated, and you want to call these methods to get more information. For example, the plusDays method gets a new LocalDate. If the object of this method is called the current object, the new date object is a new date from the number of days specified by the current object:

LocalDate aThousandDaysLater = newYearsEve.plusDays (1000) int year = aThousandDaysLater.getYear (); / 2024int month = aThousandDaysLater.getMonthValue (); / / 10int day = aThousandDaysLater.getDayOfMonth (); / / 11

The LocalDate class encapsulates the instance domain to maintain the set date. Without looking at the source code, it is impossible to know the date representation within the class.

Java gets the date of the specified day last week

Get the date of last Monday

LocalDate local=LocalDate.now () with (DayOfWeek.MONDAY)

The above method changes the specified day last week as long as you change the parameter in the with () method to specify the filter condition. For example, to get today's date belongs to the Tuesday of this week, you can:

LocalDate local=LocalDate.now () with (DayOfWeek.TUESDAY)

Get the date of a certain day last month

/ / now () the current time is 2019.5.17LocalDate nowDate = LocalDate.now (); System.out.println (nowDate.minusMonths (1) .with (MonthDay.of (nowDate.minusMonths (1). GetMonth (), 3)) The above is about the content of this article on "how to use the LocalDate class in the Java library". I believe we all have a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please follow the industry information channel.

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