Java YearMonth isSupported(TemporalField)用法及代碼示例

YearMonth類的isSupported(TemporalField)方法用於檢查YearMonth類是否支持指定的字段，這意味著使用此方法，我們可以檢查是否可以為指定的字段查詢YearMonth對象。

ChronoField支持的字段是：

MONTH_OF_YEAR
PROLEPTIC_MONTH
YEAR_OF_ERA
年
時代

所有其他ChronoField實例將返回false。

用法:

public boolean isSupported(TemporalField field)

參數：此方法僅接受一個參數字段，該參數字段表示要檢查的字段。

返回值：如果此YearMonth支持該字段，則此方法返回布爾值true，否則返回false。

以下示例程序旨在說明isSupported(TemporalField)方法：

程序1:

// Java program to demonstrate 
// YearMonth.isSupported(TemporalField) method 
  
import java.time.*; 
import java.time.temporal.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // Create a YearMonth object 
        YearMonth thisYearMonth = YearMonth.of(2017, 8); 
  
        // print instance 
        System.out.println("YearMonth:"
                           + thisYearMonth); 
  
        // apply isSupported() method 
        boolean value 
            = thisYearMonth.isSupported( 
                ChronoField.PROLEPTIC_MONTH); 
  
        // print result 
        System.out.println("PROLEPTIC_MONTH Field is supported by YearMonth class:"
                           + value); 
    } 
}

輸出：

YearMonth:2017-08
PROLEPTIC_MONTH Field is supported by YearMonth class:true

程序2:

// Java program to demonstrate 
// YearMonth.isSupported(TemporalField) method 
  
import java.time.*; 
import java.time.temporal.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // Create a YearMonth object 
        YearMonth thisYearMonth = YearMonth.of(2017, 8); 
  
        // print instance 
        System.out.println("YearMonth:"
                           + thisYearMonth); 
  
        // apply isSupported() method 
        boolean value 
            = thisYearMonth.isSupported( 
                ChronoField.HOUR_OF_DAY); 
  
        // print result 
        System.out.println("HOUR_OF_DAY Field is supported by YearMonth class:"
                           + value); 
    } 
}

輸出：

YearMonth:2017-08
HOUR_OF_DAY Field is supported by YearMonth class:false

參考文獻：
https://docs.oracle.com/javase/10/docs/api/java/time/YearMonth.html#isSupported(java.time.temporal.TemporalField)

相關用法

注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 YearMonth isSupported(TemporalField) method in Java with Examples。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。