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Starbucks Coffee order project Starbucks Coffee order project (CAFE): ● 1) coffee type / single product: Espresso, ShortBlack, LongBlack, Decaf ● 2) seasoning: Mik, Soy, Chocolate ● 3) it is required to have good expansibility, easy modification and maintenance when expanding new coffee varieties ● 4) use OO to calculate the cost of diffe ...

Detailed explanation of design mode - single case mode This article introduces a design pattern - singleton pattern. 　 1, Singleton mode 1. Definitions As the object creation mode, the singleton mode ensures that a class has only one instance, and instantiates itself and provides this instance to the whole system. This class is called ...

Yesterday, I summarized and digested the strategy mode. Students who need to see can see my design mode First blog post . Today, we continue to explain the observer mode in HeadFirst. Firstly, the definition of observer pattern is given. Observer mode definition: The observer pattern defines one to many dependencies between objects. In this ...

catalogue Dimitt's law Basic introduction Application examples Application example improvement Precautions and details of Dimitri's law Composite Reuse Principle Basic introduction Design principles and core ideas Dimitt's law Basic introduction 1) One object should have minimal knowledge of other objects 2) The closer the rela ...

catalogue 1, Agent mode 2, Static proxy (1) Static proxy (2) Simple implementation of static agent 3, Dynamic agent (1) Dynamic agent (2) Simple implementation of dynamic agent 4, Principle analysis of dynamic agent 5, InvocationHandler interface and Proxy class 6, Comparison and summary of JDK dynamic agent ...

Simple factory (not one of 23 design modes) Implementation method: BeanFactory. BeanFactory in Spring is the embodiment of the simple factory pattern. Bean objects are obtained by passing in a unique ID, but whether they are created after or before passing in parameters depends on the specific situation.Essence: a factory class dynamically dete ...

Template method pattern purpose Template method: when the steps are determined and fixed, the details of each step are differentiated in multiple subclasses through polymorphic mechanism, which is the effect that template method can achieve; classification Template method mode: it belongs to behavior mode in design mode; Specific examples ...

Decorator mode 1 Concept It refers to the mode of dynamically adding a responsibility (adding other additional functions) to the object without changing the existing object structure. 2 Structure Roles in decorator mode: Abstract build role: define an abstract interface to standardize objects ready to accept additional responsibilitiesConc ...

The first step of observer mode learning: copying concepts Definition: defines a one to many dependency between objects. When the state of an object changes, all objects that depend on it will be notified and updated automaticallyIt mainly solves the problem of notifying other objects of an object's state change, and needs to consider ease of ...

Complete notes Directory: Contents of notes on detailed explanation of design pattern , welcome advice! Structural mode describes how to form a larger structure of classes or objects according to a certain layout. There are two types: Class structured pattern: uses inheritance mechanism to organize interfaces and classes.Object struc ...