uml constants

    There are many types of UML diagrams, only two of the most important and common-class and time series diagrams are discussed here. 1. Class Diagram through the class diagram, we can easily understand the code architecture, clarify the

Turn:Coupling strength comparison of five relationships in UML class Diagrams: dependency Association aggregation combination inheritance I. Dependency relationship:(i) DescriptionDashed + arrow Can be described as:Uses aDependency is one of the

Sequence diagramA sequence diagram is a form of an interaction diagram that shows the evolution of an object along a lifeline, and the interaction between objects over time is expressed as a message from the source lifeline to the target lifeline.

[State mode] State Pattern, statepattern Let's first design a scenario where the beverage vending machine will design its sales process. In the flowchart, we can regard this process as several states: coin status, select the beverage status, sales

Concepts of VO, PO, do, DTO, BO, QO, DAO, Pojo in Java PO (Persistant object) Persistent object The concept of the O/R mapping occurs when there is no O/R mapping, and no such concept exists. Usually the corresponding data model (database), itself

This article describes the basic knowledge of objects and classes in PHPV5. it covers inheritance from the most basic concepts, mainly for experienced object-oriented programmers and readers who have not touched on objects. As a PHP programmer, you

In detail before JDK 1.4, Java IO Operations were concentrated in the Java.io package and were based on the streaming synchronization (blocking) API. For most applications, such APIs are easy to use, however, some applications with high performance

This is my lesson Web Java course notes, the original video link is: http://www.imooc.com/learn/1244-1 polymorphism in Javadefinition: Multiple forms of an object1. Quoting polymorphicReferences to the parent class can point to objects of this class;

There are 23 gof design patterns, which can be divided into three categories: Creation type, structure type, and behavior type. This article mainly discusses creation type. The design patterns of the creation model include: simple factory, factory

In php, the "& quot; ::& quot;" double colon affects lazycms: $ sysname. this is the first time you see this expression. what does "double colon" mean? answer: directly belongs to the method or attribute of the class. That is, the use of static