Java 中的等时日期(int，int，int)方法，示例

原文:https://www . geesforgeks . org/isochronomics-dateint-int-int-method-in-Java-with-example/

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。

语法:

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

参数:该方法以下列参数为参数。

  • 预测年:国际标准化组织年份字段的整数预测年
  • 月:ISO 月字段的整数月
  • 日:ISO 日字段的整数日

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、年字段无法形成结构化日期，该方法抛出 DateTimeException 。 以下举例说明日期()方法: 例 1:

Java 语言(一种计算机语言，尤用于创建网站)

// 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);
        }
    }
}

Output: 

LocalDate is: 1440-05-24

例 2:

Java 语言(一种计算机语言，尤用于创建网站)

// 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);
        }
    }
}

Output

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/isochronomics . html # date-int-int-int-

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