UML class diagrams

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Learn how to make classes, attributes, and methods in this UML Class Diagram tutorial. There's also in-depth training and examples on inheritance, aggregation, and composition relationships.

UML (or Unified Modeling Language) is a software engineering language that was developed to create a standard way of visualizing the design of a system. And UML Class Diagrams describe the structure of a system by showing the system’s classes and how they relate to one another.

This tutorial explains several characteristics of class diagrams. Within a class, there are attributes, methods, visibility, and data types. All of these components help identify a class and explain what it does.

There are also several different types of relationships that exist within UML Class Diagrams. Inheritance is when a child class (or subclass) takes on all the attributes and methods of the parent class (or superclass). Association is a very basic relationship where there's no dependency. Aggregation is a relationship where the part can exist outside the whole. And finally, Composition is when a part cannot exist outside the whole. A class would be destroyed if the class it's related to is destroyed.

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00:00 Introduction
00:20 Class
01:08 Attributes
02:06 Methods
03:05 Visibility
4:04 Zoo system example
4:29 Lucidchart
04:59 Inheritance
06:22 Abstraction
06:55 Association
07:15 Aggregation
08:00 Composition
08:46 Multiplicity
09:37 Real-world example
12:06 Conclusion

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[Msnadine]

My professor couldn’t explain what you just made crystal clear in 10 mins throughout 10+ hours of lectures. THANK YOU!

[garyctube]

I used to be a professional trainer and consultant in object-oriented analysis and design with UML. And I was a product manager for UML modeling tools. I found this video to be extremely effective in describing how many of the basic OO concepts apply in UML class diagrams. Very impressive!

[eliasreyes]

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[sakarienuh]

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[danielhegyi]

The only video you ever need to watch about UML diagrams. Great job.

[Sakina]

two semesters and today is the day I understood class diagrams
Thank

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[wubishetzerihun]

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[Wantedhavingfun]

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[bontlephello]

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[eliezetotero]

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[carljohnson]

Clear illustrations.Nice. Looks like a channel with million+ subs

[ibrahimomar]

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[salihabulut]

simplest and most comprehensive explanation, thanks

[memyaccount]

Btw protected visibility generally has 2 different meanings, depending on the language used. In some languages, the video definition applies. In some other languages, like Java, it additionally allows access to other classes in the package.

[OrSNCucumber]

10:55 Quick question: Why the fields and methods of User aren't protected (#)? Shouldn't a Customer class object know its password for example (To execute updateProfile() method)?
I don't understand what Customer and Administrator classes are getting from the inheritance of user. Also, Shouldn't User be <i>Abstract</i>?

Awesome video regardless 🙂 Wish I would watch it before!

[PrithaMajumder]

Thank You So Much for This Amazing Lectures 😁