February 2008
Intermediate to advanced
1288 pages
39h 39m
English
book
Java 6 Illuminated: An Active Learning Approach, 2nd Edition
by Julie Anderson, Herve J. Franceschi
Content preview from Java 6 Illuminated: An Active Learning Approach, 2nd Edition
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10.6 Polymorphism 697
TABLE 10.6 Restrictions for Defining abstract Classes and Methods
abstract classes • Classes must be declared abstract if the class contains any abstract
methods.
• abstract classes can be extended.
• abstract classes cannot be used to instantiate objects.
abstract methods • abstract methods can be declared only within an abstract class.
• An abstract method must consist of a method header followed by a
semicolon.
• abstract methods cannot be called.
• abstract methods cannot be declared as private or static.
• A constructor cannot be declared abstract.
Java imposes a few restrictions on declaring and using abstract classes and
methods. ...
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