Titlebook: Design Patterns with Java ; An Introduction Olaf Musch Textbook 2023 The Editor(s) (if applicable) and The Author(s), under exclusive lice

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Diffusions in Random EnvironmentsThis chapter explains some basic principles of object-oriented software development, on which much of the book is based. Their advantages and disadvantages as well as their application in design patterns are also described. In the further course of the book, there will be repeated references to these principles.

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Entwurfsunterlagen für LuftschraubenThe singleton pattern is used for the creation of an object that may only exist once. This requires certain constructions, which in the actual sense must even violate principles of object-oriented programming. Nevertheless, the Singleton Pattern is one of the simpler design patterns.

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Hubschraubermissionen und Markt,The mediator pattern enables the flexible interaction of several objects/classes that may not know each other. The mediation function can be varied very flexibly, but can also lead to very extensive implementations. In contrast to the Observer or the Chain of Responsibility, the Mediator also has its own tasks to perform.

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Der Rotor, dynamisch betrachtet,The Command Pattern enables the separation of command invocation and command execution, which are coupled via a command object. Similar to the Chain of Responsibility, these two parts are decoupled, but in the Command Pattern a concrete executing instance is always responsible. This enables logbooks and undo operations, for example.

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