Java 中的时间调整第一天第一个()方法，示例

原文:https://www . geeksforgeeks . org/temporaladjasters-first dayofmonth-method-in-Java-with-examples/

临时调整类的first day fmonth()方法用于返回“每月第一天”临时调整对象，该对象返回设置为当月第一天的新的 Date 对象。

语法:

public static TemporalAdjuster firstDayOfMonth()

参数:此方法不接受任何内容。

返回值:此方法返回当月第一天的调整器，不为空。

下面的程序说明了临时调整的第一天()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);
    }
}

Output:

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);
    }
}

Output:

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/temporalaadjusters . html

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