Java中的 JapaneseDate from() 方法和示例

Java.time.chrono.JapaneseDate类的from()方法用于根据日本日历系统获取特定时间对象的日本日期。

句法：

public static JapaneseDate from(
       TemporalAccessor temporal)

参数：此方法采用任何时间访问器的对象，在此基础上将形成日本日期。
返回值：该方法根据日本日历系统返回指定时间对象的日本日期。

以下是说明from()方法的示例：
示例 1：

Java

// Java program to demonstrate from() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // creating and initializing
            // TemporalAccessor object
            ZonedDateTime zonedate
                = ZonedDateTime
                      .parse(
                          "2018-10-25T23:12:31."
                          + "123+02:00[Europe/Paris]");
 
            // Creating and initializing
            // JapaneseDate Object
            JapaneseDate hidate
              = JapaneseDate.from(zonedate);
 
            // Display the result
            System.out.println("JapaneseDate: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出

JapaneseDate: Japanese Heisei 30-10-25

示例 2：

Java

// Java program to demonstrate from() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
 
            // creating and initializing
            // TemporalAccessor object
            LocalDateTime localdate
                = LocalDateTime.parse(
                    "2018-12-30T19:34:50.63");
 
            // Creating and initializing
            // JapaneseDate Object
            JapaneseDate hidate
              = JapaneseDate.from(localdate);
 
            // Display the result
            System.out.println("JapaneseDate: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出

JapaneseDate: Japanese Heisei 30-12-30

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/JapaneseDate.html#from-java.time.temporal.TemporalAccessor-