Java 中的 temporalaadjusters first dayofyear()方法，带示例

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

时间调整类的first dayofyeear()方法用于返回“一年的第一天”时间调整对象，该对象返回设置为一年的第一天的新的 Date 对象。

语法:

public static TemporalAdjuster firstDayOfYear()

参数:此方法不接受任何内容。

返回值:此方法返回年度调整器的第一天，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.firstDayOfYear()

import java.time.LocalDate;
import java.time.temporal.*;

public class GFG {
    public static void main(String[] args)
    {

        // get TemporalAdjuster with first day
        // of the year adjuster
        TemporalAdjuster temporalAdjuster
            = TemporalAdjusters.firstDayOfYear();

        // using adjuster for local date-time
        LocalDate localDate
            = LocalDate.of(2012, 05, 31);
        LocalDate firstDayOfYear
            = localDate.with(temporalAdjuster);

        // print
        System.out.println("First day of the "
                           + "year for localdate "
                           + localDate + ": "
                           + firstDayOfYear);
    }
}

Output:

First day of the year for localdate 2012-05-31: 2012-01-01

程序 2:

// Java program to demonstrate
// TemporalAdjusters.firstDayOfYear() method

import java.time.LocalDate;
import java.time.temporal.*;

public class GFG {
    public static void main(String[] args)
    {

        // get TemporalAdjuster with first day
        // of the year adjuster
        TemporalAdjuster temporalAdjuster
            = TemporalAdjusters.firstDayOfYear();

        // using adjuster for local date time
        LocalDate localDate
            = LocalDate.of(2000, 12, 21);
        LocalDate firstDayOfYear
            = localDate.with(temporalAdjuster);

        // print
        System.out.println("First day of the "
                           + "year for localdate "
                           + localDate + ": "
                           + firstDayOfYear);
    }
}

Output:

First day of the year for localdate 2000-12-21: 2000-01-01

参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/time/format/temporalaadjusters . html

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