java 根据类名示例化类_Java即时类| with（）方法与示例

java 根据类名示例化类

即时类with()方法 (Instant Class with() method)

Syntax:

句法：

    public Instant with(TemporalAdjuster t_adjuster);
    public Instant with(TemporalField t_field, long new_val);

• with() method is available in java.time package.

  with()方法在java.time包中可用。

• with(TemporalAdjuster t_adjuster) method is used to represent this Instant with the given adjuster.

  with(TemporalAdjuster t_adjuster)方法用于用给定的调整器表示此Instant。

• with(TemporalField t_field, long new_val) method is used to set the given value for the given field.

  with(TemporalField t_field，long new_val)方法用于为给定字段设置给定值。

• These methods may throw an exception at the time of representing Instant with the given adjustment.

  在使用给定的调整量表示Instant时，这些方法可能会引发异常。

  • DateTimeException: This exception may throw when this Instant couldn't adjust with the given adjuster.DateTimeException ：如果此Instant无法使用给定的调整器进行调整，则可能引发此异常。
  • ArithmeticException: This exception may throw when the calculated result exceeds the limit to represent this object.ArithmeticException ：当计算结果超出表示此对象的限制时，可能引发此异常。

• These are non-static methods and it is accessible with class objects and if we try to access these methods with the class name then we will get an error.

  这些是非静态方法，可通过类对象访问，如果尝试使用类名访问这些方法，则会收到错误消息。

Parameter(s):

参数：

• In the first case, "with(TemporalAdjuster t_adjuster)",

  在第一种情况下，“ with(TemporalAdjuster t_adjuster)”

  • TemporalAdjuster t_adjuster – represents the field in which to set the value the given value.
  • TemporalAdjuster t_adjuster –表示在其中将值设置为给定值的字段。

• In the second case, "with(TemporalField t_field, long new_val)",

  在第二种情况下，“ with(TemporalField t_field，long new_val)”，

  • TemporalField t_field – represents the field in which to set the value the given value.
  • TemporalField t_field –表示将值设置为给定值的字段。
  • long new_val – represents new value to set for the given field.
  • long new_val –表示要为给定字段设置的新值。

Return value:

返回值：

In both the cases, the return type of the method is Instant, it returns the Instant that holds the value of this Instant with the given object.

在这两种情况下，方法的返回类型均为Instant ，它返回包含具有给定对象的该Instant值的Instant。

Example:

例：

// Java program to demonstrate the example 
// of with() method of Instant

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

public class WithOfInstant {
    public static void main(String args[]) {
        long field_val = 10;

        // Instantiates two Instant 
        Instant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");
        Instant ins2 = Instant.now();

        // Display ins1,ins2
        System.out.println("Instant ins1 and ins2: ");
        System.out.println("ins1: " + ins1);
        System.out.println("ins2: " + ins2);
        System.out.println("field_val to set: " + field_val);

        System.out.println();

        // Here, this method adjusts this Instant 
        // with the given adjuster
        Instant with_val = ins1.with(ins2);

        // Display with_val
        System.out.println("ins1.with(ins2): " + with_val);

        // Here, this method sets the new value 
        // for the given field in this Instant
        with_val = ins1.with(ChronoField.MICRO_OF_SECOND, field_val);

        // Display with_val
        System.out.println("ins1.with(ChronoField.MICRO_OF_SECOND,field_val): " + with_val);
    }
}

Output

输出量

Instant ins1 and ins2: 
ins1: 2006-04-03T05:10:15Z
ins2: 2020-05-28T07:42:39.007362Z
field_val to set: 10

ins1.with(ins2): 2020-05-28T07:42:39.007362Z
ins1.with(ChronoField.MICRO_OF_SECOND,field_val): 2006-04-03T05:10:15.000010Z

翻译自: https://www.includehelp.com/java/instant-with-method-with-example.aspx

java 根据类名示例化类