4. Builder Pattern
Model motivationPattern definitionPattern structureSequence diagramcode analysispattern analysisexampleadvantageshortcomingApplicable environmentMode applicationMode extensionsummary
4.1. Model motivation
There are many components in the real world, such as the wheel, the steering wheel and ...
Posted by newb110508 on Thu, 10 Mar 2022 02:23:24 +0100
Project address: https://gitee.com/caochenlei/design-pattern
Chapter 1 Introduction to command mode
Introduction to command mode:
In software development system, there is often a close coupling relationship between "method requester" and "method implementer", which is not conducive to the expansion and maintena ...
Posted by ScottCFR on Tue, 08 Mar 2022 22:27:23 +0100
Several commonly used design patterns (I): design principle, strategy pattern and observer pattern
Core: reuse - resist change
Object oriented design principles:
1. Dependency Inversion Principle (DIP)
High level modules (stable) should not rely on low-level modules (change), but both should rely on abstraction (stable). Abstract (st ...
Posted by jmicozzi on Tue, 08 Mar 2022 14:30:24 +0100
The design principle is a summary of some experience guiding our code design, that is, "mental method"; Object oriented is our "weapon"; Design pattern is "move".
Based on mental skill, use weapon moves to deal with complex programming problems.
Me: sister, what do I think you've been busy lately? Didn't you chang ...
Posted by faizulbari on Tue, 08 Mar 2022 11:33:17 +0100
1) You can obtain different phone numbers from another Activity to call.
2) You can turn on the camera to take pictures and display them in the picture box
3) You can send text messages
4) The interface is shown in the figure
1, Page layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http: ...
Posted by mattl on Tue, 08 Mar 2022 08:37:12 +0100
Adapter Pattern: one of the structural patterns, which converts the interface of a class into another interface desired by the customer. The Adapter Pattern allows classes that cannot work together because of incompatible interfaces to work together.
2, UML class diagram
3, Roles and responsibilities
Target role: this role defin ...
Posted by thomasd1 on Tue, 08 Mar 2022 07:39:09 +0100
The observer pattern defines a one to many dependency that allows multiple observer objects to listen to a subject object at the same time. When the state of the subject object changes, it will notify all observer objects so that they can update themselves automatically. -- Dahua design mode
How would you write the code if you had to inform ...
Posted by kristolklp on Tue, 08 Mar 2022 06:21:28 +0100
18. Responsibility chain model
18.1 example 2
19. Observer mode
19.1 example 2
20. Status mode
18. Responsibility chain model
Responsibility chain mode: make multiple objects have the opportunity to process the request, so as to avoid the coupling relationship between the sender and receiver of the request. Connect these objec ...
Posted by BobcatM on Tue, 08 Mar 2022 05:22:09 +0100
1, Singleton mode
Definition: ensure that a class has only one instance and provide a global access point to access it. For example, when we click the login button, a login floating window will appear in the page, and this login floating window is unique. No matter how ...
Posted by hwttdz on Mon, 07 Mar 2022 21:55:47 +0100
The bridge pattern is simply to separate the abstract part from its implementation part, so that they can change independently.
In some compositions, if each class implements different services, Cartesian product may appear, and the use of bridge mode can easily decouple abstraction from implementation, so that they can change independently. H ...
Posted by turbocueca on Mon, 07 Mar 2022 03:10:33 +0100