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Generally, the factory pattern is divided into three more subdivided types: simple factory, factory method and abstract factory. However, in GoF's book design patterns, it regards simple factory patterns as a special case of factory method patterns, so factory patterns are only divided into factory methods and abstract factories. In the rookie ...

1, Basic introduction to singleton mode The so-called class singleton design pattern is to take certain methods to ensure that there can only be one object instance for a class in the whole software system, and the class only provides a method to obtain its object instance (static method). 2, There are eight ways of singleton mode Hu ...

1. Brief overview The observer pattern defines the one to many relationship between objects, that is, when the state of an object changes, it will tell other dependent objects to update the state accordingly.In the observer mode, the object that sends the status change notification is called the subject, and the object that receives and re ...

Lazy singleton mode Code implementation: public class SingletonMode { private static SingletonMode instance=null; //Privatize the construction method to prevent external instantiation private SingletonMode(){} public static SingletonMode getInstance(){ if(instance==null){ instance =new SingletonMode();//Ca ...

1. Knowledge Points BasicsDesign PrinciplesTemplate MethodObserver modePolicy Mode 2. Recommended Books Design Patterns - Fundamentals of Reusable Object-Oriented SoftwareReconstructing and Models 3. Foundation Design Mode A design pattern is a validated solution to a specific problem that occurs repeatedly in a particular environment ...

0. Ma Xian inspirational Have a dream, even if it is far away. 1. General If you travel to European countries, their sockets are shown on the far left of the figure below, which is the European standard. The plug we use is shown on the far right in the figure below. Therefore, our laptops and mobile phones cannot be directly charged loca ...

definition State mode: when the internal state of an object changes, it is allowed to change its behavior. The object looks like it has changed its class. And strategy mode are twins. It mainly solves the problem when the conditional expression controlling the state transition of an object is too complex. That is, the state judgment logic ...

We all know that in JVM garbage collection, GC can judge whether the object instance or data in the heap is garbage by reference counting method and reachability algorithm. Whether the number of references of an object is determined by the reference counting algorithm, whether the reference chain of an object is reachable by the root search al ...

catalogue 1. Background: 2. Definition of singleton mode: 3. Lazy man - several problems in the single case development process:          three point one   Single thread single instance mode creation three point two   Test whether the single instance mode can maintain the definition in the case of multithreading   three ...

Schematic diagram Bridge schema definition: divides abstraction and behavior into separate but dynamic combinations. To summarize object-oriented, there are actually two sentences: one is Coupling, the other is Cohesion. The goal of the object system is to maximize the Cohesion within the system modules and minimize the modules. Coupling be ...