Java 中带(TemporalAdjuster)方法的 ChronoLocalDateTime，示例

原文:https://www . geeksforgeeks . org/chronolocaldatetime-with temporalaadjuster-method-in-Java-with-examples/

使用时间本地日期时间界面的带(时间调整调节器)方法，使用时间调整调节器调整该日期时间，调整后返回调整后的日期时间的副本。使用指定的调整器策略对象进行调整。ChronoLocalDateTime 的这个实例是不可变的，不受此方法调用的影响。简单的调整器用于设置其中一个字段，例如年份字段，在该字段中，更复杂的调整器可能会将时间设置为一年中的最后一天。

语法:

default ChronoLocalDateTime with(TemporalAdjuster adjuster)

参数:该方法接受调节器作为参数，调节器使用该参数。

返回值:该方法基于此返回一个进行了调整的 ChronoLocalDateTime。

异常:此方法抛出以下异常:

  • Abnormal date and time -If it cannot be adjusted.
  • Arithmetic exception -If there is a numerical overflow.

下面的程序说明了 with()方法:

程序 1:

// Java program to demonstrate
// ChronoLocalDateTime.with() method

import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;

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

        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime
                  .parse("2019-12-31T19:15:30");

        // print instance
        System.out.println("ChronoLocalDateTime before"
                           + " adjustment: "
                           + time);

        // apply with method of ChronoLocalDateTime
        ChronoLocalDateTime updatedlocal
            = time.with(Month.OCTOBER)
                  .with(TemporalAdjusters
                            .firstDayOfMonth());

        // print instance
        System.out.println("ChronoLocalDateTime after"
                           + " adjustment: "
                           + updatedlocal);
    }
}

输出:

ChronoLocalDateTime before adjustment: 2019-12-31T19:15:30
ChronoLocalDateTime after adjustment: 2019-10-01T19:15:30

程序二:

// Java program to demonstrate
// ChronoLocalDateTime.with() method

import java.time.*;
import java.time.chrono.*;
import java.time.temporal.*;

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

        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime
                  .parse("2018-10-25T23:12:31.123");

        // print instance
        System.out.println("ChronoLocalDateTime before"
                           + " adjustment: "
                           + time);

        // apply with method of ChronoLocalDateTime
        ChronoLocalDateTime updatedlocal
            = time.with(Month.JANUARY)
                  .with(TemporalAdjusters
                            .firstDayOfMonth());

        // print instance
        System.out.println("ChronoLocalDateTime after"
                           + " adjustment: "
                           + updatedlocal);
    }
}

输出:

ChronoLocalDateTime before adjustment: 2018-10-25T23:12:31.123
ChronoLocalDateTime after adjustment: 2018-01-01T23:12:31.123

参考:https://docs . Oracle . com/javase/9/docs/API/Java/time/chrono/chronolocaldatetime . html # with-Java . time . temporalaadjuster-

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