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  2. Factory method pattern - Wikipedia

    en.wikipedia.org/wiki/Factory_method_pattern

    This PHP example shows interface implementations instead of subclassing (however, the same can be achieved through subclassing). The factory method can also be defined as publicand called directly by the client code (in contrast to the previous Java example).

  3. Facade pattern - Wikipedia

    en.wikipedia.org/wiki/Facade_pattern

    In this UML class diagram, the Client class doesn't access the subsystem classes directly. Instead, the Client works through a Facade class that implements a simple interface in terms of (by delegating to) the subsystem classes (Class1, Class2, and Class3). The Client depends only on the simple Facade interface and is independent of the complex ...

  4. Abstract factory pattern - Wikipedia

    en.wikipedia.org/wiki/Abstract_factory_pattern

    The client would only need to know how to handle the abstract Letter or Resume class, not the specific version that was created by the concrete factory. As the factory only returns a reference or a pointer to an abstract type, the client code that requested the object from the factory is not aware of—and is not burdened by—the actual ...

  5. Dependency injection - Wikipedia

    en.wikipedia.org/wiki/Dependency_injection

    In turn, a client is any class which uses services. The services that a client requires are the client's dependencies. Any object can be a service or a client; the names relate only to the role the objects play in an injection. The same object may even be both a client (it uses injected services) and a service (it is injected into other objects).

  6. Class (computer programming) - Wikipedia

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

    For example, the Java language does not allow client code that accesses the private data of a class to compile. [12] In the C++ language, private methods are visible, but not accessible in the interface; however, they may be made invisible by explicitly declaring fully abstract classes that represent the interfaces of the class.

  7. Adapter pattern - Wikipedia

    en.wikipedia.org/wiki/Adapter_pattern

    A sample UML class diagram for the adapter design pattern. [5] In the above UML class diagram, the client class that requires a target interface cannot reuse the adaptee class directly because its interface doesn't conform to the target interface. Instead, the client works through an adapter class that implements the target interface in terms ...

  8. Command pattern - Wikipedia

    en.wikipedia.org/wiki/Command_pattern

    For example, to undo a delete selection command, the object may contain a copy of the deleted text so that it can be re-inserted, if the delete selection command must be undone. Note that using a separate object for each invocation of a command is also an example of the chain of responsibility pattern. The term execute is also ambiguous.

  9. Class-based programming - Wikipedia

    en.wikipedia.org/wiki/Class-based_programming

    Also, another common example is that a person object created from a child class cannot become an object of parent class because a child class and a parent class inherit a person class but class-based languages mostly do not allow to change the kind of class of the object at runtime. For class-based languages, this restriction is essential in ...