UML-Deja Vu and uml-Deja vu

UML-Deja Vu and uml-Deja vu

When I saw the UML, I felt that it was very tall. There was such a cultural name, and there was a more meaningful explanation: design tools, there was a kind of visual feeling immediately. Software Engineering is a design idea, while UML is a design tool. It has not yet begun to learn. How can it feel like a stranger? Let me hear about it. First, let's get to know UML.

UnifiedModeling Language (UML), also known as the unified modeling Language or standard modeling Language, refers to the anatomy of UML. The core is the Language. will you think of many languages you have learned here? SQL server (Structured Query Language) ...... UML is an object-oriented modeling language... Object-oriented: It's no wonder that I have been familiar with the terms I learned from vb.

Since it is an object-oriented modeling language, three attributes of object-oriented: encapsulation, inheritance, and polymorphism are essential.

Encapsulation: hides the implementation from the customer. The customer only sees the interface and the process is not important. Only one result is required.

Inheritance relationship: parent-child relationship. The maximum reusable function is used to inherit all the attributes that can be inherited by the parent class.

Polymorphism: allows a pointer of the subclass type to be assigned to the pointer of the parent class. Some subclasses of the parent class also exist, and are extended based on the parent class.

Object-oriented advantages: reliability, maintenance, and support. Object-oriented has gone through vb, software engineering, and UML along with us, and the idea of object-oriented is the same in vb, software engineering, and UML. The most important thing to learn about UML object-oriented in UML is four relationships: dependency, association, generalization, and implementation. Next blog: four types of UML relationships.

What do you mean by deja vu?

S ì céng xi ā ng shí

Idiom: deja vu

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[Explanation] I have seen it before. Describe the appearance of things you have seen.

[Source] Song Yanshu's "Xi Sha" word: "I can't help it, like I once knew that Yan returned, xiaoyuan Xiangwei alone ."

[Syntax] compact, act as a predicate and attribute, and describe the re-emergence of things you have seen

Met deja vu

This is the true love for a person. if you really love a person, you will think that he is an essential part of your body and soul. If you look at a person just because of his appearance, body, and position, then there is no difference between people and animals, animals will look at each other's appearance, body, and status. That is to say, people have a "animal" side, but people have evolved, therefore, we better understand that true love should remove the above points and pursue fusion in a higher realm, not just for the sake of sex, but for the other party. the beautiful appearance will indeed be fascinated by the other party in an instant, or even turn it upside down. But if there is no real personality that will make the other party infatuated, then they will not get along for a long time, because according to the investigation, true love lasts for a short period of time. Only the other party has some internal characteristics that can make people fall in love and love can last for a long time. In fact, love has been transformed into a collection of various emotions, such: attachment, habits, understanding, support, affection, and so on, then you will want to stay with him all your life, maybe you will like the handsome guy, or even have a one-night stand with a handsome guy, because everyone has the "animal", but you will not abandon him that you really like, because he is an indispensable part of your body and soul.