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

Syntax:

句法：

    public boolean isSupported (TemporalField t_field);
public boolean isSupported (TemporalUnit t_unit);

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

  isSupported()方法在java.time包中可用。

• isSupported (TemporalField t_field) method is used to identify whether this given field is supported or not on this Instant.

  isSupported(TemporalField t_field)方法用于标识此Instant是否支持此给定字段。

• isSupported (TemporalUnit t_unit) method is used to identify whether this given unit is supported or not on this Instant.

  isSupported(TemporalUnit t_unit)方法用于标识此Instant是否支持此给定的单位。

• These methods don't throw an exception at the time of checking status.

  这些方法在检查状态时不会引发异常。

• 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, "isSupported (TemporalField t_field)",

  在第一种情况下，“ isSupported(TemporalField t_field)”，

  • TemporalField t_field – represents the field to be checked for support.
  • TemporalField t_field –表示要检查支持的字段。

• In the second case, "isSupported (TemporalUnit t_unit)",

  在第二种情况下，“ isSupported(TemporalUnit t_unit)”，

  • TemporalUnit t_unit – represents the unit to be checked for support.
  • TemporalUnit t_unit –表示要检查支持的单位。

Return value:

返回值：

In both the cases, the return type of the method is boolean,

在这两种情况下，方法的返回类型均为boolean 。

• In the first case, it returns true when the given field is supported at this Instant otherwise it returns false.

  在第一种情况下，当此Instant支持给定字段时，它返回true，否则返回false。

• In the second case, it returns true when the given unit is supported at this Instant.

  在第二种情况下，当此Instant支持给定单位时，它返回true。

Example:

例：

// Java program to demonstrate the example
// of isSupported() method of Instant
import java.time.*;
import java.time.temporal.*;
public class IsSupportedOfInstant {public static void main(String args[]) {// 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();
// Here, this method checks whether this
// Instant (ins1) support the given
// field or not i.e. here it returns
// true because ins1 supports
// MICRO_OFSECOND
boolean status = ins1.isSupported(ChronoField.MICRO_OF_SECOND);
// Display status
System.out.println("ins1.isSupported(ChronoField.MICRO_OF_SECOND): " + status);
// Here, this method checks whether this
// Instant (ins2) supports the given
// unit or not i.e. here it returns
// true because ins2 supports
// MINUTES
status = ins2.isSupported(ChronoUnit.MINUTES);
// Display status
System.out.println("ins2.isSupported(ChronoUnit.MINUTES): " + status);
}
}

Output

输出量

Instant ins1 and ins2:
ins1: 2006-04-03T05:10:15Z
ins2: 2020-05-28T00:46:53.435757Zins1.isSupported(ChronoField.MICRO_OF_SECOND): true
ins2.isSupported(ChronoUnit.MINUTES): true

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