Java TemporalAdjusters firstDayOfNextMonth()用法及代碼示例

TemporalAdjusters類的firstDayOfNextMonth()方法用於返回“下個月的第一天” TemporalAdjuster對象，該對象返回一個設置為下個月第一天的新Date對象。

用法:

public static TemporalAdjuster firstDayOfNextMonth()

參數：此方法不接受任何內容。

返回值：此方法返回下個月的第一天調整器，不為null。

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

// Java program to demonstrate 
// TemporalAdjusters.firstDayOfNextMonth() 
  
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 next month adjuster 
        TemporalAdjuster temporalAdjuster 
            = TemporalAdjusters.firstDayOfNextMonth(); 
  
        // using adjuster for local date time 
        LocalDate localDate 
            = LocalDate.of(2020, 05, 11); 
        LocalDate firstDayOfNextMonth 
            = localDate.with(temporalAdjuster); 
  
        // print 
        System.out.println("First day of next "
                           + "month for localdate "
                           + localDate + ":"
                           + firstDayOfNextMonth); 
    } 
}

輸出：

First day of next month for localdate 2020-05-11:2020-06-01

程序2:

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

輸出：

First day of next month for localdate 2010-12-29:2011-01-01

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

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