Programmer Group

UML Sequence Diagram Sequence diagrams are the most commonly used UML diagrams after class diagrams. Sequence diagrams represent interactions as a two-dimensional graph with the time axis vertically and the time going down vertically. The horizontal axis represents the roles in collaboration and is generally a Class.Objects, with a dashed line ...

Create pattern: prototype pattern Prototype mode 1. Prototype mode: Introduction Prototype mode Solution: create duplicate objects.The object content itself is complex, and it takes a long time to obtain relevant object data from the database or RPC interface. Therefore, replication is needed to save time. 2. Prototype mode: simulat ...

Creative mode: Builder mode Builder pattern 1. Builder mode: Introduction Builder pattern The core purpose is to build a complex object step by step by using multiple simple objects.The final intention of the builder's model is to produce specific contents according to the same materials and different assembly methodsThat is, a comp ...

Detailed explanation of responsibility chain mode, c + + implementation Responsibility chain model Definition: multiple objects have the opportunity to process the request, avoid the coupling relationship between the sender and receiver of the request, connect the processing objects into a chain, and pass the request along the chain until an o ...

https://www.educoder.net/paths/43 Level 1: Linux initial experience #!/bin/bash #Write the command to complete the task in the following section #*********begin*********# cd / ls -a #********* end *********# Level 2: common Linux commands #!/bin/bash #Write the command to complete the task in the following section #*********begin*********# ...

definition In Strategy Pattern, the behavior of a class or its algorithm can be changed at run time. This type of design pattern belongs to behavioral pattern. In the policy pattern, we create objects representing various policies and a context object whose behavior changes with the change of policy objects. The policy object changes the exec ...

5. Prototype mode          Prototype pattern refers to specifying the type of objects to be created with prototype instances, and creating new objects by copying these prototypes          Prototype pattern is a creative design pattern that allows an object to ...

definition Using an instance that has been created as a prototype, create a new object that is the same as the prototype object by copying the prototype object. Role and class diagram of pattern The prototype pattern contains the following roles: Abstract prototype class: Specifies the clone() method that the concrete prototype object m ...

Java singleton pattern Single case introduction Singleton Pattern is one of the simplest design patterns in Java. This type of design pattern is a creation pattern, which provides the best way to create objects. This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is c ...

1, What is the proxy model Proxy mode: provides an avatar for an object to control access to the object. That is, through the agent Object to access the target object Advantages: Based on the realization of the target object, additional function operations can be enhanced, that is, the function of the target object can be extended. The proxi ...