Java中的 IsoChronology prolepticYear() 方法与示例

Java.time.chrono.IsoChronology 类的prolepticYear()方法用于检索特定 hijrah 时代的 Iso 系统中存在的 proleptic 年份。

句法：

public int prolepticYear(Era era,
                         int yearOfEra)

参数：此方法将以下参数作为参数。

• era：这是iso Era的对象。
• yearofEra：这是特定 iso 时代的年份。

返回值：该方法返回特定iso时代iso系统中的预测年份。

以下是说明prolepticYear()方法的示例：

示例 1：

// Java program to demonstrate
// prolepticYear() 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 prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(IsoEra.CE, 2020);
  
            // display the result
            System.out.println("proleptic Year is: "
                               + proyear);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

proleptic Year is: 2020

示例 2：

// Java program to demonstrate
// prolepticYear() 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 prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(IsoEra.BCE, 1980);
  
            // display the result
            System.out.println("proleptic Year is: "
                               + proyear);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出：

proleptic Year is: -1979

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