Java IsoChronology resolveDate()用法及代碼示例

java.time.chrono.IsoChronology類的resolveDate()方法通過在特定解析器樣式的幫助下，通過解析與Map中特定long值相關聯的chrono字段，來根據Iso日曆檢索本地日期。

用法:

public LocalDate resolveDate(
       Map fieldValues,
       ResolverStyle resolverStyle)

參數：此方法將以下參數作為參數：

fieldvalues:這將包含計時字段。
resolverStyle:這將解決計時字段並提供日期。

返回值：此方法通過使用特定解析器樣式來解析與Map中特定long值關聯的Chrono字段，從而根據Iso日曆返回本地日期。

下麵是說明resolveDate()方法的示例：

範例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 
            // LocalDate Object 
            LocalDate hidate 
                = LocalDate.now(); 
  
            // getting IsoChronology 
            // used in LocalDate 
            IsoChronology crono 
                = hidate.getChronology(); 
  
            // creating and initializing HashMap 
            HashMap<TemporalField, Long> map 
                = new HashMap<TemporalField, Long>(); 
  
            // 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("LocalDate is:"
                               + hidate); 
        } 
        catch (DateTimeException e) { 
            System.out.println("passed parameter can"
                               + " not form a date"); 
            System.out.println("Exception thrown:"
                               + e); 
        } 
    } 
}

輸出：

LocalDate is:1970-01-31

範例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 
            // LocalDate Object 
            LocalDate hidate 
                = LocalDate.now(); 
  
            // getting IsoChronology 
            // used in LocalDate 
            IsoChronology crono 
                = hidate.getChronology(); 
  
            // creating and initializing HashMap 
            HashMap<TemporalField, Long> map 
                = new HashMap<TemporalField, Long>(); 
  
            // putting element into HashMap 
            map.put((TemporalField) 
                        ChronoField.HOUR_OF_AMPM, 
                    2000l); 
  
            // getting the resolveDate with 
            // SMART ResolverStyle 
            // by using resolveDate() method 
            hidate 
                = crono.resolveDate( 
                    map, 
                    ResolverStyle.LENIENT); 
  
            // display the result 
            System.out.println("LocalDate is:"
                               + hidate); 
        } 
        catch (DateTimeException e) { 
            System.out.println( 
                "passed parameter can"
                + " not form a date"); 
            System.out.println( 
                "Exception thrown:"
                + e); 
        } 
    } 
}

輸出：

LocalDate is:null

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

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 IsoChronology resolveDate() method in Java with Example。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。