Java TemporalAdjusters firstDayOfMonth()用法及代碼示例

TemporalAdjusters類的firstDayOfMonth()方法用於返回“每月的第一天” TemporalAdjuster對象，該對象返回設置為當前月第一天的新的Date對象。

用法:

public static TemporalAdjuster firstDayOfMonth()

參數：此方法不接受任何內容。

返回值：此方法返回第一個day-of-month調節器，不為null。

以下示例程序旨在說明TemporalAdjusters.firstDayOfMonth()方法：
程序1:

// Java program to demonstrate 
// TemporalAdjusters.firstDayOfMonth() 
  
import java.time.LocalDate; 
import java.time.temporal.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // get TemporalAdjuster with first day 
        // of month adjuster 
        TemporalAdjuster temporalAdjuster 
            = TemporalAdjusters 
                  .firstDayOfMonth(); 
  
        // using adjuster for local date-time 
        LocalDate localDate 
            = LocalDate.of(2020, 05, 11); 
        LocalDate firstDayOFMonth 
            = localDate.with(temporalAdjuster); 
  
        // print 
        System.out.println("First day for "
                           + "month for localdate "
                           + localDate + ":"
                           + firstDayOFMonth); 
    } 
}

輸出：

First day for month for localdate 2020-05-11:2020-05-01

程序2:

// Java program to demonstrate 
// TemporalAdjusters.firstDayOfMonth() method 
  
import java.time.LocalDate; 
import java.time.temporal.TemporalAdjuster; 
import java.time.temporal.TemporalAdjusters; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // get TemporalAdjuster with first day 
        // of month adjuster 
        TemporalAdjuster temporalAdjuster 
            = TemporalAdjusters 
                  .firstDayOfMonth(); 
  
        // using adjuster for local date-time 
        LocalDate localDate 
            = LocalDate.of(2010, 12, 29); 
        LocalDate firstDayOFMonth 
            = localDate.with(temporalAdjuster); 
  
        // print 
        System.out.println("First day for "
                           + "month for localdate "
                           + localDate + ":"
                           + firstDayOFMonth); 
    } 
}

輸出：

First day for month for localdate 2010-12-29:2010-12-01

參考文獻：https://docs.oracle.com/javase/10/docs/api/java/time/format/TemporalAdjusters.html

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