Java中的 IsoChronology dateYearDay(Era, int, int) 方法与示例

Java.time.chrono.IsoChronology类的dateYearDay()方法用于根据特定时代的 Iso 日历检索本地日期。

句法：

public LocalDate dateYearDay(Era era,
                             int yearOfEra,
                             int dayOfYear)

参数：此方法将以下参数作为参数。

• era:这是 Era 类型的对象
• year： LocalDate 的 year 字段的整数年
• day：这是LocalDate的day字段的整数天

返回值：此方法根据特定时代的 Iso 日历返回本地日期。

以下是说明dateYearDay()方法的示例：

示例 1：

// Java program to demonstrate
// dateYearDay() 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 hidate = LocalDate.now();
  
            // getting IsoChronology
            // used in LocalDate
            IsoChronology crono
                = hidate.getChronology();
  
            // getting LocalDate for the
            // given date and year field
            // by using dateYearDay() method
            LocalDate date
                = crono.dateYearDay(
                    IsoEra.BCE, 1440, 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: -1439-01-24

示例 2：

// Java program to demonstrate
// dateYearDay() 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 hidate = LocalDate.now();
  
            // getting IsoChronology
            // used in LocalDate
            IsoChronology crono
                = hidate.getChronology();
  
            // getting LocalDate for the
            // given date and year field
            // by using dateYearDay() method
            LocalDate date
                = crono.dateYearDay(
                    IsoEra.BCE, 0000, 30);
  
            // 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: 0001-01-30

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