java range类_Java即时类| range（）方法与示例

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