Java中的 TemporalAdjusters firstDayOfNextMonth() 方法及示例

TemporalAdjusters 类的firstDayOfNextMonth()方法用于返回“下个月的第一天”TemporalAdjuster 对象，该对象返回一个设置为下个月第一天的新 Date 对象。

句法：

public static TemporalAdjuster firstDayOfNextMonth()

参数：此方法不接受任何内容。

返回值：该方法返回下个月第一天的调整器，不为空。

下面的程序说明了 TemporalAdjusters.firstDayOfNextMonth() 方法：
方案一：

// 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);
    }
}

输出：

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

方案二：

// 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);
    }
}

输出：

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

参考资料：https: Java