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📜  Java8 LocalDate类

📅  最后修改于: 2020-10-01 06:36:51             🧑  作者: Mango

Java LocalDate类

Java LocalDate类是一个不可变的类，它以默认格式yyyy-MM-dd表示Date。它继承了Object类并实现了ChronoLocalDate接口

Java LocalDate类声明

让我们看看java.time.LocalDate类的声明。

public final class LocalDate extends Object 
implements Temporal, TemporalAdjuster, ChronoLocalDate, Serializable

Java LocalDate的方法

Method Description
LocalDateTime atTime(int hour, int minute) It is used to combine this date with a time to create a LocalDateTime.
int compareTo(ChronoLocalDate other) It is used to compares this date to another date.
boolean equals(Object obj) It is used to check if this date is equal to another date.
String format(DateTimeFormatter formatter) It is used to format this date using the specified formatter.
int get(TemporalField field) It is used to get the value of the specified field from this date as an int.
boolean isLeapYear() It is used to check if the year is a leap year, according to the ISO proleptic calendar system rules.
LocalDate minusDays(long daysToSubtract) It is used to return a copy of this LocalDate with the specified number of days subtracted.
LocalDate minusMonths(long monthsToSubtract) It is used to return a copy of this LocalDate with the specified number of months subtracted.
static LocalDate now() It is used to obtain the current date from the system clock in the default time-zone.
LocalDate plusDays(long daysToAdd) It is used to return a copy of this LocalDate with the specified number of days added.
LocalDateplusMonths(long monthsToAdd) It is used to return a copy of this LocalDate with the specified number of months added.

Java LocalDate示例

import java.time.LocalDate;
public class LocalDateExample1 {
  public static void main(String[] args) {
    LocalDate date = LocalDate.now();
    LocalDate yesterday = date.minusDays(1);
    LocalDate tomorrow = yesterday.plusDays(2);
    System.out.println("Today date: "+date);
    System.out.println("Yesterday date: "+yesterday);
    System.out.println("Tommorow date: "+tomorrow);
  }
}

输出：

Today date: 2017-01-13
Yesterday date: 2017-01-12
Tommorow date: 2017-01-14

Java LocalDate示例：isLeapYear()

import java.time.LocalDate;
public class LocalDateExample2 {
  public static void main(String[] args) {
    LocalDate date1 = LocalDate.of(2017, 1, 13);
    System.out.println(date1.isLeapYear());
    LocalDate date2 = LocalDate.of(2016, 9, 23);
    System.out.println(date2.isLeapYear());
  }
}

输出：

false
true

Java LocalDate示例：atTime()

import java.time.*;
public class LocalDateExample3 {
  public static void main(String[] args) {
    LocalDate date = LocalDate.of(2017, 1, 13);
    LocalDateTime datetime = date.atTime(1,50,9);    
    System.out.println(datetime); 
  }
}

输出：

2017-01-13T01:50:09