Specifications

Sun Services

Java™ Programming Language

Module 6, slide 22 of 43

Casting Objects

• Use instanceof to test the type of an object.

• Restore full functionality of an object by casting.

• Check for proper casting using the following

guidelines:

• Casts upward in the hierarchy are done implicitly.

• Downward casts must be to a subclass and checked

by the compiler.

• The object type is checked at runtime when runtime

errors can occur.