Java java.time.temporal.WeekFields用法及代碼示例

WeekFields類代表星期的定義，提供TemporalField實例。 WeekFields 提供五個字段：weekOfYear()、weekOfMonth()、dayOfWeek()、weekOfWeekBasedYear() 和 weekBasedYear()，它們提供對任何時間對象的值的訪問。

每個不同的 WeekFields 都需要一個單獨的 Field 實例，並且需要：

一周開始
最少天數

類聲明：

public final class WeekFields
extends Object
implements Serializable

WeekFields類繼承以下方法 來自 java.lang.Object 類：

clone()
finalize()
getClass()
notify()
notifyAll()
wait()

WeekFields類的方法：

方法	說明
dayOfWeek()	此方法返回一個字段，用於根據此 WeekFields 訪問星期幾。
equals(Object object)	此方法檢查此WeekFields是否等於指定的對象。
getFirstDayOfWeek()	此方法獲取第一個day-of-week。
getMinimalDaysInFirstWeek()	此方法在第一周獲得最少的天數。
hashCode()	此方法返回此 WeekFields 的哈希代碼。
of(DayOfWeek firstDayOfWeek, int minimalDaysInFirstWeek)	此方法從第一個 day-of-week 和最少天數中獲取 WeekFields 的實例。
of(Locale locale)	此方法獲取適合區域設置的 WeekFields 實例。
toString()	此方法獲取此 WeekFields 實例的字符串表示形式。
weekBasedYear()	此方法返回一個字段，用於根據此 WeekFields 訪問 week-based-year 的年份。
weekOfMonth()	此方法返回一個字段，用於根據此 WeekFields 訪問月份中的第幾周。
weekOfWeekBasedYear()	此方法返回一個字段，用於根據此 WeekFields 訪問 week-based-year 的周。
weekOfYear()	此方法返回一個字段，用於根據此 WeekFields 訪問一年中的第幾周。

示例 1：

Java


// Java program to demonstrate 
// WeekFields class 
  
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); 
  
        // creating separate temporal fields for each method 
  
        // apply dayOfWeek() 
        TemporalField dayOfWeek = weekFields.dayOfWeek(); 
  
        // apply weekBasedYear() 
        TemporalField weekBasedYear 
            = weekFields.weekBasedYear(); 
  
        // apply weekOfMonth() 
        TemporalField weekOfMonth 
            = weekFields.weekOfMonth(); 
  
        // apply weekOfWeekBasedYear() 
        TemporalField weekOfWeekBasedYear 
            = weekFields.weekOfWeekBasedYear(); 
  
        // create a LocalDate 
        LocalDate day = LocalDate.of(2021, 03, 31); 
  
        // get day of week for localdate 
        int dow = day.get(dayOfWeek); 
  
        // get week based year for localdate 
        int wby = day.get(weekBasedYear); 
  
        // get week of month for localdate 
        int wom = day.get(weekOfMonth); 
  
        // get week of week for localdate 
        int wow = day.get(weekOfWeekBasedYear); 
  
        // print results 
  
        System.out.println("day of week for " + day + " :"
                           + dow); 
        System.out.println("week based year for " + day 
                           + " :" + wby); 
        System.out.println("week of month for " + day + " :"
                           + wom); 
        System.out.println("Week of week for " + day + " :"
                           + wow); 
    } 
}

輸出

day of week for 2021-03-31 :3
week based year for 2021-03-31 :2021
week of month for 2021-03-31 :5
Week of week for 2021-03-31 :14

示例 2：

Java


// Java program to demonstrate 
// WeekFields class 
  
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); 
  
        // creating separate temporal fields for each method 
  
        // apply dayOfWeek() 
        TemporalField dayOfWeek = weekFields.dayOfWeek(); 
  
        // apply weekBasedYear() 
        TemporalField weekBasedYear 
            = weekFields.weekBasedYear(); 
  
        // apply weekOfMonth() 
        TemporalField weekOfMonth 
            = weekFields.weekOfMonth(); 
  
        // apply weekOfWeekBasedYear() 
        TemporalField weekOfWeekBasedYear 
            = weekFields.weekOfWeekBasedYear(); 
  
        // create a LocalDate 
        LocalDate day = LocalDate.of(2021, 12, 05); 
  
        // get day of week for localdate 
        int dow = day.get(dayOfWeek); 
  
        // get week based year for localdate 
        int wby = day.get(weekBasedYear); 
  
        // get week of month for localdate 
        int wom = day.get(weekOfMonth); 
  
        // get week of week for localdate 
        int wow = day.get(weekOfWeekBasedYear); 
  
        // print results 
  
        System.out.println("day of week for " + day + " :"
                           + dow); 
        System.out.println("week based year for " + day 
                           + " :" + wby); 
        System.out.println("week of month for " + day + " :"
                           + wom); 
        System.out.println("Week of week for " + day + " :"
                           + wow); 
    } 
}

輸出

day of week for 2021-12-05 :1
week based year for 2021-12-05 :2021
week of month for 2021-12-05 :2
Week of week for 2021-12-05 :50

相關用法

注：本文由純淨天空篩選整理自surbhityagi15大神的英文原創作品 java.time.temporal.WeekFields Class in Java。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。