LocalDate类isSupported()方法 (LocalDate 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 check whether the given field is supported or not.

  isSupported(TemporalField t_field)方法用于检查是否支持给定的字段。

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

  isSupported(TemporalUnit t_unit)方法用于标识是否支持给定的单位。

• 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 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 cases, 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 cases, atStartOfDay(ZoneId zo),

  在第二种情况下，在atStartOfDay(ZoneId zo)，

  • 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 otherwise it returns false.

  在第一种情况下，当支持给定字段时，它返回true，否则返回false。

• In the second case, it returns true when the given unit is supported otherwise it returns false.

  在第二种情况下，当支持给定单元时，它返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example
// of isSupported() method of LocalDate
import java.time.*;
import java.time.temporal.*;
public class IsSupportedOfLocalDate {public static void main(String args[]) {// Instantiates two LocalDate
LocalDate l_da1 = LocalDate.parse("2007-04-04");
LocalDate l_da2 = LocalDate.now();
// Display l_da1,l_da2
System.out.println("LocalDate l_da1 and l_da2: ");
System.out.println("l_da1: " + l_da1);
System.out.println("l_da2: " + l_da2);
System.out.println();
// Here, this method checks whether
// the given field DAY_OF_WEEK is
// supported or not
boolean status = l_da1.isSupported(ChronoField.DAY_OF_WEEK);
// Display status
System.out.println("l_da1.isSupported(ChronoField.DAY_OF_WEEK): " + status);
// Here, this method checks whether
// the given unit DECADES is supported
// or not
status = l_da2.isSupported(ChronoUnit.DECADES);
// Display status
System.out.println("l_da2.isSupported(ChronoUnit.DECADES): " + status);
}
}

Output

输出量

LocalDate l_da1 and l_da2:
l_da1: 2007-04-04
l_da2: 2020-06-03l_da1.isSupported(ChronoField.DAY_OF_WEEK): true
l_da2.isSupported(ChronoUnit.DECADES): true

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