Programmer Think

This article is excerpted from "design patterns should be learned this way"1. Application scenario of factory method modeThe factory method mode is mainly applicable to the following application scenarios.(1) Creating objects requires a lot of repetitive code.(2) The client (application layer) does not depend on the details of how pro ...

This article is excerpted from "design patterns should be learned this way" 1. Use delegation mode to simulate task allocation scenarios We use code to simulate the business scenario where the boss assigns tasks to employees. First, create the IEmployee employee interface. public interface IEmployee { void doing(String task) ...

0. Ma Xian inspirational Any restriction starts from your heart. 1. General definition: Encapsulates some operations that act on each element in a data structure. It can define new operations that act on these elements without changing the data structure. 2. Structure The visitor pattern contains the following main roles: Abstract Vi ...

0. Ma Xian inspirational It's not difficult to endure those hard days, because I know it will get better. 1. General definition: Also known as Publish/Subscribe mode, it defines a one to many dependency that allows multiple observer objects to listen to a topic object at the same time. When the state of the subject object changes, it wi ...

Opening and closing,Richter substitution,Dependency inversion,Single responsibility,Interface isolation,Dimitt,Synthetic multiplexing In addition to the principles of opening and closing, Richter substitution, dependency inversion and single responsibility, the principles of object-oriented design also include the principles of interface isola ...

1, Introduction to agent mode 1.1 definitions Proxy is a design pattern that provides another access to the target object; That is to access the target object through the proxy object. The advantage of this is that additional function operations can be enhanced on the basis of the implementation of the target object, that is, the funct ...

1. Factory mode 1. Concept Factory Pattern is one of the most commonly used design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects. In factory mode, when creating objects, we do not expose the creation logic to the client, and point to the newly created objects by usi ...

1. Single principle Too many lines of code, functions or attributes in the class will affect the readability and maintainability of the code, so we need to consider splitting the class;Classes depend on too many other classes, or depend on too many other classes, which does not conform to the design idea of high cohesion and low coupling, so w ...

Statement: This blog refers to the Chinese Language C website: C Language Chinese Network Connection The main record is learning the following: 1. Simple Factory Mode II. Factory Method Mode 3. Abstract Factory Mode Each main point consists of the following two parts: (1) Basic concepts and model structure (including some NOUN explanations, mo ...

1, Introduction to Xiangyuan mode 1.1 definitions Definition of Flyweight pattern: using sharing technology to effectively support the reuse of a large number of fine-grained objects. By sharing existing objects, it can greatly reduce the number of objects to be created and avoid the overhead of a large number of similar classes, so as ...