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2. Category:Template-Class Java pages - Wikipedia

   en.wikipedia.org/wiki/Category:Template-Class...

   This category contains articles that are supported by Wikipedia:WikiProject Java. Articles are automatically added to this category by the {{ WikiProject Java }} template or by parameters given to the {{ WikiProject Computing }} template.

3. Abstract type - Wikipedia

   en.wikipedia.org/wiki/Abstract_type

   By default, all methods in all classes are concrete, unless the abstract keyword is used. An abstract class may include abstract methods, which have no implementation. By default, all methods in all interfaces are abstract, unless the default keyword is used. The default keyword can be used to specify a concrete method in an interface.

4. Template method pattern - Wikipedia

   en.wikipedia.org/wiki/Template_method_pattern

   The template method is used for the following reasons. [3] It lets subclasses implement varying behavior (through overriding of the hook methods). [6] It avoids duplication in the code: the general workflow of the algorithm is implemented once in the abstract class's template method, and necessary variations are implemented in the subclasses. [6]

5. Class (computer programming) - Wikipedia

   en.wikipedia.org/wiki/Class_(computer_programming)

   Before a class derived from an abstract class can be instantiated, all abstract methods of its parent classes must be implemented by some class in the derivation chain. [25] Most object-oriented programming languages allow the programmer to specify which classes are considered abstract and will not allow these to be instantiated. For example ...

6. Abstract data type - Wikipedia

   en.wikipedia.org/wiki/Abstract_data_type

   Modern object-oriented languages, such as C++ and Java, support a form of abstract data types. When a class is used as a type, it is an abstract type that refers to a hidden representation. In this model, an ADT is typically implemented as a class, and each instance of the ADT is usually an object of that class.

7. Interface (Java) - Wikipedia

   en.wikipedia.org/wiki/Interface_(Java)

   An interface in the Java programming language is an abstract type that is used to declare a behavior that classes must implement. They are similar to protocols.Interfaces are declared using the interface keyword, and may only contain method signature and constant declarations (variable declarations that are declared to be both static and final).