Java中的 IsoChronology date(int, int, int) 方法与示例

Java.time.chrono.IsoChronology类的date()方法用于根据 ISO 日历系统获取给定年、月和日的本地日期。

句法：

public LocalDate date(int prolepticYear,
                      int month,
                      int dayOfMonth)

参数：此方法将以下参数作为参数。

• prolepticYear： ISO 年份字段的整数预测年份
• 月份： ISO月份字段的整数月份
• day： ISO 的 day 字段的整数天

返回值：该方法根据ISO日历系统返回给定年月日的本地日期。
异常：如果给定的日、月和年字段无法形成结构化日期，则此方法抛出DateTimeException 。
以下是说明date()方法的示例：
示例 1：

Java

// Java program to demonstrate
// date() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing LocalDate Object
            LocalDate lodate = LocalDate.now();
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = lodate.getChronology();
 
            // getting LocalDate for the
            // given date, month and year field
            // by using date() method
            LocalDate date = crono.date(1440, 05, 24);
 
            // display the result
            System.out.println("LocalDate is: " + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can "
                               + "not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

LocalDate is: 1440-05-24

示例 2：

Java

// Java program to demonstrate
// date() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing LocalDate Object
            LocalDate lodate = LocalDate.now();
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = lodate.getChronology();
 
            // getting LocalDate for the
            // given date, month and year field
            // by using date() method
            LocalDate date = crono.date(2020, 05, 34);
 
            // display the result
            System.out.println("LocalDate is: " + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can "
                               + "not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出

passed parameter can not form a date
Exception thrown: java.time.DateTimeException: Invalid value for DayOfMonth (valid values 1 - 28/31): 34

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/IsoChronology.html#date-int-int-int-