"Things You Don't Know series" class for working with dates in Java

Java provides a series of classes for working with date and time, including creation date, time object, getting system current date, time, etc.

Date class:

Located in Java.util.Date, it exists from the JDK1.0, but now most of its constructors, methods are obsolete and are no longer recommended for use.

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Calendar class:

Abstract class that implements a serialized interface for representing the calendar. Creating a Calendar object can be obtained through several static getinstance () methods.

Calendar and date are tool classes that represent dates, and they are freely convertible, with the following code:

Calendar calendar = calendar.getinstance ();D ate Date = Calendar.gettime (); Calendar calendar2 = Calendar.getinstance (); Calendar2.settime (date);

The Calendar class provides a number of ways to access, modify, and use date-time methods:

void Add (int field, int amount); Modify the rules for the calendar to add or subtract the specified amount of time int get (int field) for the given calendar field; Returns the value of the specified calendar field int getactualmaximum (int field); Returns the maximum value that a specified calendar field might have. For example, the maximum value for the month is 11int getactualmininum (int field); Returns the minimum value that a specified calendar field might have. For example, the minimum value for the month is 0void roll (int field, int amount); Similar to the Add () method, the difference is that when a amount exceeds the maximum range that the field can represent, it does not carry the void set (int field, int value) up one field; Sets the given Calendar field to the given value void set (int year, int month, int date); Sets the value of the calendar object's year, month, and Day 3 fields to void set (int year, int month, int date, int hourofday, int minute, int second)://Set Calendar object's years , month, day, time, minute, second 6 field values

"Things You Don't Know series" class for working with dates in Java