Java中的 JapaneseChronology prolepticYear() 方法与示例

Java.time.chrono.JapaneseChronology类的prolepticYear()方法用于检索特定日本时代的日本系统中存在的 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。

• 时代：这是日本时代的对象。
• yearofEra：这是特定日本时代的年份

返回值：此方法返回特定日本时代的 Japaneseh 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
            // JapaneseDate Object
            JapaneseDate hidate
                = JapaneseDate.now();
  
            // getting JapaneseChronology
            // used in JapaneseDate
            JapaneseChronology crono
                = hidate.getChronology();
  
            // getting prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(
                    JapaneseEra.HEISEI,
                    1444);
  
            // 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: 3432

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
            // JapaneseDate Object
            JapaneseDate hidate
                = JapaneseDate.now();
  
            // getting JapaneseChronology
            // used in JapaneseDate
            JapaneseChronology crono
                = hidate.getChronology();
  
            // getting prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(
                    JapaneseEra.SHOWA, 1200);
  
            // 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：

passed parameter can not form a date
Exception thrown: java.time.DateTimeException: Invalid yearOfEra value

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