Java Instant adjustInto()方法与实例

Instant类的 adjustInto(Temporal temporal) 方法将传递的时间对象调整为具有该方法所适用的瞬间。

语法

public Temporal adjustInto(Temporal temporal)

参数： 该方法接受一个参数 temporal ，它是要调整的目标时间对象。它不应该是空的。

返回值 ：该方法返回调整后的时间对象。

异常： 该方法抛出以下异常。

• DateTimeException 如果这个方法不能进行调整。
• 如果调整时发生数字溢出，则抛出 ArithmeticException 。

下面的程序说明了Instant.adjustInto()方法。

程序1 :

// Java program to demonstrate
// Instant.adjustInto() method
  
import java.time.*;
import java.time.temporal.Temporal;
  
public class GFG {
  
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.parse("2018-11-20T16:55:30.00Z");
  
        // create a Temporal object
        // which is equal to OffsetDateTime object
        OffsetDateTime passTemporal
            = OffsetDateTime.now();
  
        // print passed Value
        System.out.println("Passed Value: "
                           + passTemporal);
  
        // apply adjustInto method
        // to adjust OffsetDateTime Temporal
        // to instant object
        Temporal returnTemporal
            = instant.adjustInto(passTemporal);
  
        // print results
        System.out.println("Returned Value: "
                           + (OffsetDateTime)returnTemporal);
    }
}

输出:

Passed Value: 2018-11-22T09:22:17.297Z
Returned Value: 2018-11-20T16:55:30Z

程序2

// Java program to demonstrate
// Instant.adjustInto() method
  
import java.time.*;
import java.time.temporal.Temporal;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.parse("2018-11-17T06:50:39.00Z");
  
        // create a Temporal object
        // which is equal to ZonedDateTime object
        ZonedDateTime passTemporal
            = ZonedDateTime.now();
  
        // print passed Value
        System.out.println("Passed Value: "
                           + passTemporal);
  
        // apply adjustInto method
        // to adjust ZonedDateTime Temporal
        // to instant object
        Temporal returnTemporal
            = instant.adjustInto(passTemporal);
  
        // print results
        System.out.println("Returned Value: "
                           + (ZonedDateTime)returnTemporal);
    }
}

输出:

Passed Value: 2018-11-22T09:22:20.995Z[Etc/UTC]
Returned Value: 2018-11-17T06:50:39Z[Etc/UTC]

程序3 。

// Java program to demonstrate
// Instant.adjustInto() method
  
import java.time.*;
import java.time.temporal.Temporal;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.parse("2017-11-01T16:25:00.00Z");
  
        // create a Temporal object
        // which is equal to Instant object
        // with current Instant
        Temporal passTemporal
            = Instant.now();
  
        // print passed Value
        System.out.println("Passed Value: "
                           + passTemporal);
  
        // apply adjustInto method to adjust Temporal
        // to this instant object
        Temporal returnTemporal
            = instant.adjustInto(passTemporal);
  
        // print results
        System.out.println("Returned Value: "
                           + returnTemporal);
    }
}

输出:

Passed Value: 2018-11-22T09:22:23.298Z
Returned Value: 2017-11-01T16:25:00Z

参考资料: https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#adjustInto(java.time.temporal.Temporal)。