Java TemporalAdjusters firstDayOfMonth()用法及代码示例

TemporalAdjusters类的firstDayOfMonth()方法用于返回“每月的第一天” TemporalAdjuster对象，该对象返回设置为当前月第一天的新的Date对象。

用法:

public static TemporalAdjuster firstDayOfMonth()

参数：此方法不接受任何内容。

返回值：此方法返回第一个day-of-month调节器，不为null。

以下示例程序旨在说明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); 
    } 
}

输出：

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); 
    } 
}

输出：

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

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

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 TemporalAdjusters firstDayOfMonth() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。