JapaneseChronology prolepticYear() method in Java with Example

The prolepticYear() method of java.time.chrono.JapaneseChronology class is used to retrieve the proleptic year present in the Japanese system of particular Japanese era. 

Syntax:

public int prolepticYear(Era era,
                         int yearOfEra)

Parameter: This method takes the following argument as a parameter.

• era: which is the object of Japanese Era.
• yearofEra: which is the year for the particular Japanese era

Return Value: This method returns the proleptic year present in the Japanese system of particular Japanese era. 

Below are the examples to illustrate the prolepticYear() method: 

Example 1:

Java

// 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);
        }
    }
}

Output:

proleptic Year is: 3432

Example 2:

Java

// 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);
        }
    }
}

Output:

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

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