Java syntax: Difference between revisions

Revision as of 10:07, 22 December 2015

Revision as of 10:08, 22 December 2015

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A class C has abstract methods if any of the following is true:

* C explicitly contains a declaration of an abstract method.

A* direct superinterfaceAny of C's declaressuperclasses orhas inheritsan aabstract method (which is therefore necessarily abstract) and C neither declares nor inherits a method that implements it.

Any* A direct superinterface of C's superclassesdeclares hasor aninherits abstracta method (which is therefore necessarily abstract) and C neither declares nor inherits a method that implements it.

* A subclass of an abstract class that is not itself abstract may be instantiated, resulting in the execution of a constructor for the abstract class and, therefore, the execution of the field initializers for instance variables of that class.

A direct superinterface of C declares or inherits a method (which is therefore necessarily abstract) and C neither declares nor inherits a method that implements it.

A subclass of an abstract class that is not itself abstract may be instantiated, resulting in the execution of a constructor for the abstract class and, therefore, the execution of the field initializers for instance variables of that class.

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