Java中的 JapaneseChronology resolveDate() 方法与示例

Java.time.chrono.JapaneseChronology类的resolveDate()方法用于通过在特定解析器样式的帮助下解析与地图中特定长值关联的 chrono 字段，根据日本日历检索日本日期。

句法：

public JapaneseDate resolveDate(
       Map fieldValues,
       ResolverStyle resolverStyle)

参数：此方法将以下参数作为参数：

• fieldvalues：这将包含计时字段。
• resolverStyle：这将解析 chrono 字段并提供日期。

返回值：此方法通过在特定解析器样式的帮助下解析与地图中特定长值关联的 Chrono 字段，根据日本日历返回本地日期。

以下是说明resolveDate()方法的示例：

示例 1：

// Java program to demonstrate
// resolveDate() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
import java.time.format.*;
  
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();
  
            // creating and initializing HashMap
            HashMap map
                = new HashMap();
  
            // putting element into HashMap
            map.put((TemporalField)
                        ChronoField.EPOCH_DAY,
                    30l);
  
            // getting the resolveDate with
            // SMART ResolverStyle
            // by using resolveDate() method
            hidate
                = crono.resolveDate(
                    map,
                    ResolverStyle.LENIENT);
  
            // display the result
            System.out.println("JapaneseDate is : "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出：

JapaneseDate is : Japanese Showa 45-01-31

示例 2：

// Java program to demonstrate
// resolveDate() method
  
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;
import java.time.format.*;
  
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();
  
            // creating and initializing HashMap
            HashMap map
                = new HashMap();
  
            // putting element into HashMap
            map.put((TemporalField)
                        ChronoField.HOUR_OF_AMPM,
                    30l);
  
            // getting the resolveDate with
            // SMART ResolverStyle
            // by using resolveDate() method
            hidate
                = crono.resolveDate(
                    map,
                    ResolverStyle.LENIENT);
  
            // display the result
            System.out.println("JapaneseDate is : "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: "
                               + e);
        }
    }
}

输出：

JapaneseDate is : null

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/JapaneseChronology.html#resolveDate-java.util.Map-java.time.format.ResolverStyle-