Java LocalDate minusWeeks()用法及代碼示例

Java中LocalDate類的minusWeeks()方法用於從此LocalDate中減去指定周數並返回LocalDate的副本，例如2018-12-24減去一周將得出2018-12-17。此實例是不可變的，不受此方法調用的影響。

用法:

public LocalDate minusWeeks(long weeksToSubtract)

參數：此方法接受單個參數weeksToSubtract，該參數表示要減去的周數，可以為負數。

返回值：此方法基於該日期返回LocalDate，並減去周數，而不是null。

異常：如果結果超出支持的日期範圍，則此方法將引發DateTimeException。

以下示例程序旨在說明minusWeeks()方法：

示例1:

// Java program to demonstrate 
// LocalDate.minusWeeks() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a LocalDate object 
        LocalDate date 
            = LocalDate.parse("2018-12-26"); 
  
        // print instance 
        System.out.println("LocalDate before"
                           + " subtracting weeks: " + date); 
  
        // subtract 2 weeks 
        LocalDate returnvalue 
            = date.minusWeeks(2); 
  
        // print result 
        System.out.println("LocalDate after "
                           + " subtracting weeks: " + returnvalue); 
    } 
}

輸出：

LocalDate before subtracting weeks: 2018-12-26
LocalDate after  subtracting weeks: 2018-12-12

示例2:

// Java program to demonstrate 
// LocalDate.minusWeeks() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a LocalDate object 
        LocalDate date 
            = LocalDate.parse("2018-12-24"); 
  
        // print instance 
        System.out.println("LocalDate before"
                           + " subtracting weeks: " + date); 
  
        // subtract -13 weeks 
        LocalDate returnvalue 
            = date.minusWeeks(-13); 
  
        // print result 
        System.out.println("LocalDate after "
                           + " subtracting weeks: " + returnvalue); 
    } 
}

輸出：

LocalDate before subtracting weeks: 2018-12-24
LocalDate after  subtracting weeks: 2019-03-25

參考：
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#minusWeeks(long)

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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 LocalDate minusWeeks() 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。