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  2. Flyweight pattern - Wikipedia

    en.wikipedia.org/wiki/Flyweight_pattern

    A sample UML class and sequence diagram for the Flyweight design pattern. [6] The above UML class diagram shows: the Client class, which uses the flyweight pattern; the FlyweightFactory class, which creates and shares Flyweight objects; the Flyweight interface, which takes in extrinsic state and performs an operation

  3. Class diagram - Wikipedia

    en.wikipedia.org/wiki/Class_diagram

    In software engineering, a class diagram [1] in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. The class diagram is the main building block of object-oriented ...

  4. Character large object - Wikipedia

    en.wikipedia.org/wiki/Character_large_object

    It is a collection of character data in a database management system, usually stored in a separate location that is referenced in the table itself. Oracle and IBM Db2 provide a construct explicitly named CLOB, [1] [2] and the majority of other database systems support some form of the concept, often labeled as text, memo or long character fields.

  5. Composition over inheritance - Wikipedia

    en.wikipedia.org/wiki/Composition_over_inheritance

    The C++ examples in this section demonstrate the principle of using composition and interfaces to achieve code reuse and polymorphism. Due to the C++ language not having a dedicated keyword to declare interfaces, the following C++ example uses inheritance from a pure abstract base class.

  6. Prototype pattern - Wikipedia

    en.wikipedia.org/wiki/Prototype_pattern

    Creating objects directly within the class that requires (uses) the objects is inflexible because it commits the class to particular objects at compile-time and makes it impossible to specify which objects to create at run-time. The prototype design pattern describes how to solve such problems: Define a Prototype object that returns a copy of ...

  7. Decorator pattern - Wikipedia

    en.wikipedia.org/wiki/Decorator_pattern

    A sample UML class and sequence diagram for the Decorator design pattern. [7] In the above UML class diagram, the abstract Decorator class maintains a reference (component) to the decorated object (Component) and forwards all requests to it (component.operation()). This makes Decorator transparent (invisible) to clients of Component.

  8. Singleton pattern - Wikipedia

    en.wikipedia.org/wiki/Singleton_pattern

    A class diagram exemplifying the singleton pattern. In object-oriented programming, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns, which describe how to solve recurring problems in object-oriented software. [1]

  9. Stereotype (UML) - Wikipedia

    en.wikipedia.org/wiki/Stereotype_(UML)

    In UML, become is a keyword for a specific UML stereotype, and applies to a dependency (modeled as a dashed arrow). Become shows that the source modeling element (the arrow's tail) is transformed into the target modeling element (the arrow's head), while keeping some sort of identity, even though it may have changed values, state, or even class.