org.apache.commons.lang
public class IllegalClassException extends IllegalArgumentException
Thrown when an object is an instance of an unexpected type (a class or interface).
This exception supplements the standard IllegalArgumentException
by providing a more semantically rich description of the problem.
IllegalClassException
represents the case where a method takes
in a genericly typed parameter like Object (typically because it has to due to some
other interface it implements), but this implementation only actually accepts a specific
type, for example String. This exception would be used in place of
IllegalArgumentException
, yet it still extends it.
public void foo(Object obj) { if (obj instanceof String == false) { throw new IllegalClassException(String.class, obj); } // do something with the string }
Since: 2.0
Version: $Id: IllegalClassException.java 161243 2005-04-14 04:30:28Z ggregory $
Constructor Summary | |
---|---|
IllegalClassException(Class expected, Object actual) Instantiates with the expected type, and actual object. | |
IllegalClassException(Class expected, Class actual) Instantiates with the expected and actual types. | |
IllegalClassException(String message) Instantiates with the specified message. |
Instantiates with the expected type, and actual object.
Parameters: expected the expected type actual the actual object
Since: 2.1
Instantiates with the expected and actual types.
Parameters: expected the expected type actual the actual type
Instantiates with the specified message.
Parameters: message the exception message