Java WeekFields weekOfYear()用法及代碼示例

WeekFields類的weekOfYear()方法用於返回一個字段，以基於此WeekFields訪問一年中的星期。例：

如果一年的第一天是星期一，則第一周從第一天開始，沒有零周
如果一年的第二天是星期一，則第一周從第二天開始，而第一天在零周
如果一年中的第4天是星期一，則第1周從第4周開始，第1至第3周在零周開始
如果一年中的第5天是星期一，則第二周從第5周開始，第1至第4周在第1周

該字段可用於任何日曆係統。

用法:

public TemporalField weekOfYear()

參數：此方法不接受任何內容。

返回值：此方法返回一個提供對week-of-year的訪問權限的字段，而不是null。

以下示例程序旨在說明WeekFields.weekOfYear()方法：
程序1:

// Java program to demonstrate 
// WeekFields.weekOfYear() method 
  
import java.time.DayOfWeek; 
import java.time.LocalDate; 
import java.time.temporal.TemporalField; 
import java.time.temporal.WeekFields; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create WeekFields 
        WeekFields weekFields 
            = WeekFields.of(DayOfWeek.MONDAY, 1); 
  
        // apply weekOfYear() 
        TemporalField weekOfYear 
            = weekFields.weekOfYear(); 
  
        // create a LocalDate 
        LocalDate day 
            = LocalDate.of(2021, 12, 21); 
  
        // get week of year for localdate 
        int wow = day.get(weekOfYear); 
  
        // print results 
        System.out.println("Week of year for "
                           + day + ":" + wow); 
    } 
}

輸出：

Week of year for 2021-12-21:52

程序2:

// Java program to demonstrate 
// WeekFields.weekOfYear() method 
  
import java.time.DayOfWeek; 
import java.time.LocalDate; 
import java.time.temporal.TemporalField; 
import java.time.temporal.WeekFields; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create WeekFields 
        WeekFields weekFields 
            = WeekFields.of(DayOfWeek.SUNDAY, 1); 
  
        // apply weekOfYear() 
        TemporalField weekOfYear 
            = weekFields.weekOfYear(); 
  
        // create a LocalDate 
        LocalDate day = LocalDate.of(2014, 10, 12); 
  
        // get week of year for localdate 
        int wow = day.get(weekOfYear); 
  
        // print results 
        System.out.println("Week of year for "
                           + day + ":" + wow); 
    } 
}

輸出：

Week of year for 2014-10-12:42

參考：https：//docs.oracle.com/javase/10/docs/api/java/time/temporal/WeekFields.html#weekOfYear()

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 WeekFields weekOfYear() 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。