java range类

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

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

  range()方法在java.time包中可用。

• range() method is used to get the valid range of values for the given TemporalField.

  range()方法用于获取给定TemporalField的有效值范围。

• range() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  range()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• range() method may throw an exception at the time of returning field range.

  在返回字段范围时， range()方法可能会引发异常。

  • DateTimeException: This exception may throw when the given field value couldn't be generated.DateTimeException ：当无法生成给定的字段值时，可能引发此异常。
  • UnsupportedTemporalTypeException: This exception may throw when the given temporal field is unsupported.
  • UnsupportedTemporalTypeException ：如果不支持给定的时间字段，则可能引发此异常。

Syntax:

句法：

    public ValueRange range(TemporalField t_field);

Parameter(s):

参数：

• TemporalField t_field – represents the field of the returned values range.

  TemporalField t_field –代表返回值范围的字段。

Return value:

返回值：

The return type of this method is ValueRange, it returns range of values for the given field in this Instant.

此方法的返回类型为ValueRange ，它返回此Instant中给定字段的值范围。

Example:

例：

// Java program to demonstrate the example
// of ValueRange range(TemporalField t_field)
// method of Instant
import java.time.*;
import java.time.temporal.*;
public class RangeOfInstant {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 gets the valid
// range of values for the given field
// i.e. here the MICRO_OF_SECOND field
// range will be returned
ValueRange range = (ValueRange) ins1.range(ChronoField.MICRO_OF_SECOND);
// Display range
System.out.println("ins1.get(ChronoField.MICRO_OF_SECOND): " + range);
// Here, this method gets the valid
// range of values for the given field
// i.e. here the MILLI_OF_SECOND field
// range will be returned
range = (ValueRange) ins2.range(ChronoField.MILLI_OF_SECOND);
// Display range
System.out.println("ins2.get(ChronoField.MILLI_OF_SECOND): " + range);
// Here, this method gets the valid
// range of values for the given field
// i.e. here the NANO_OF_SECOND field
// range will be returned
range = (ValueRange) ins2.range(ChronoField.NANO_OF_SECOND);
// Display range
System.out.println("ins2.get(ChronoField.NANO_OF_SECOND): " + range);
}
}

Output

输出量

Instant ins1 and ins2:
ins1: 2006-04-03T05:10:15Z
ins2: 2020-05-27T05:30:00.259110Zins1.get(ChronoField.MICRO_OF_SECOND): 0 - 999999
ins2.get(ChronoField.MILLI_OF_SECOND): 0 - 999
ins2.get(ChronoField.NANO_OF_SECOND): 0 - 999999999

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

java range类