Altha Mikesell

Convert Use Case To Class Diagram

At the heart of any object-oriented system is the step of designing the class structure – therefore the saying goes that class diagrams are the most popular out of the UML diagram types.

In this easy class diagram tutorial, we've covered the key areas you need to know to draw class diagrams without a struggle. Scroll down to find out

  • Class Diagram Definition
  • Class Diagram Notations with Examples
  • How to Draw a Class Diagram
  • Class Diagram Best Practices
  • Class Diagram Examples/Templates

Class Diagram Definition | What is a Class Diagram?

A class diagram is a UML diagram type that describes a system by visualizing the different types of objects within a system and the kinds of static relationships that exist among them. It also illustrates the operations and attributes of the classes.

They are usually used to explore domain concepts, understand software requirements and describe detailed designs.

Class Diagram Notations with Examples

There are several class diagram notations that are used when drawing UML class diagrams. We've listed below the most common class diagram notations.

Class

Class Notation - UML class diagram tutorial Classes represent the central objects in a system. It is represented by a rectangle with up to 3 compartments.

The first one shows the class's name, while the middle one shows the class's attributes which are the characteristics of the objects. The bottom one lists the class's operations, which represents the behavior of the class.

Simple Class

Simple Class

The last two compartments are optional. The class notation without the last two compartments is called a simple class and it only contains the name of the class.

Interface

Interface notation - class diagram tutorial The interface symbol in class diagrams indicates a set of operations that would detail the responsibility of a class.

Package

Package
The package symbol is used to group classes or interfaces that are either similar in nature or related. Grouping these design elements using the package symbols improves the readability of the diagram

Class Diagram Relationships

Class Diagram Relationships

To learn about the class diagram connector types and the different relationships between classes in detail, refer to our handy guide on class diagram relationships.

For a full list of class diagram notations/ class diagram symbols refer to this post.

How to Draw a Class Diagram

Class diagrams go hand in hand with object-oriented design. So knowing its basics is a key part of being able to draw good class diagrams.

When required to describe the static view of a system or its functionalities, you'd be required to draw a class diagram. Here are the steps you need to follow to create a class diagram.

Step 1: Identify the class names

The first step is to identify the primary objects of the system.

Step 2: Distinguish relationships

Next step is to determine how each of the classes or objects are related to one another. Look out for commonalities and abstractions among them; this will help you when grouping them when drawing the class diagram.

Step 3: Create the Structure

First, add the class names and link them with the appropriate connectors. You can add attributes and functions/ methods/ operations later.

Class Diagram Best Practices

  • Class diagrams may tend to get incoherent as they expand and grow. It's best to avoid creating large diagrams and breaking them down into smaller ones that you can link to each other later. You can very easily do this with Creately. It helps you improve the readability of your diagrams.
  • Using the simple class notation, you can quickly create a high-level overview of your system. A detailed diagram can be created separately as required, and even linked to the first one for easy reference.
  • The more lines overlap on your class diagrams, the more cluttered it becomes. The reader will only get confused trying to find the path. Make sure that no two lines cross each other.
  • Use colors to group common modules. Different colors on different classes help the reader differentiate between the various groups.

Class Diagram Examples / Templates

Class Diagram Example 1

Example of a Class Diagram

Click on the template to edit it online

Class Diagram Example 2

Example of a Class Diagram

Click on the template to edit it online

Class Diagram Example 3

Other Class Diagram Resources

  • Guidelines for UML Class Diagrams – Part 1
  • Guidelines for UML Class Diagrams – Part 2
  • Tools, Templates and Resources to Draw Class Diagrams

Share Your Thoughts on the Class Diagram Tutorial

In this class diagram tutorial, we've covered what a class diagram is, class diagram notations, how to draw a class diagram and best practices you can follow when creating class diagrams. In addition, we've added a few class diagram examples that you can instantly edit online.

Interested in learning about other UML diagram types?

Source: https://creately.com/blog/diagrams/class-diagram-tutorial/

Posted by: althaalthamikeselles0250791.blogspot.com

Ignition Relay Diagram 84 Dodge

Cubey

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655 Posts

Discussion Starter · #1 ·

My manauls don't seem to tell the right location for the starte relay on the 78. They state on the left side of the firewall but there isn't one there.

So where the heck is it?

It's this kind:

Cubey

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655 Posts

Discussion Starter · #2 ·

I finally found it.. hiding under the brake booster.

Darned old 1970's USA made auto parts... only lasting 35 years! :gr_patrio

It looks like the original. The ground connect broke off trying to pull it loose. Needle nose pliers got the blade out of the plastic connector fine. It had stuff rattling inside like grit so I decided to open it up... since I'm going to try replacing it without testing it since the symptoms point to it.. and it's so old.

Key turned to "on"... proper gauges and all lit up (oil, brake)... battery solenoid (to isolate the house batteries from starting battery) was clicking on properly so it didn't seem to be a battery problem... especially since using my battery charger/engine starter also didn't help.

The starter is only a year old so that isn't suspect. When turned to start, the battery voltage didn't drop any like it was pulling power to the starter but not turning. It could be the neutral safety switch but I'll try this first since the transmission was rebuilt in 2011 and may have gotten a new one then.

Here's a couple pics of what I found inside... plus one before I opened it. That pile of junk is rust particles!

  • Auto part Metal

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Um, I think you've found a problem! :)

Cubey

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655 Posts

Discussion Starter · #4 ·

The new one I got from OReilly (BWD S109 - made in India - pictured above) doesn't even come with the nuts!

Cubey

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655 Posts

Discussion Starter · #5 ·

Okay seriously? That didn't fix the problem.

Ok guys.. I need some help. What should I check next to fix this?

- Battery is (apparently) good (Tested with engine starter hooked to battery, no dice)
- Accessories, turn signals, etc power up when key is turned
- Starter does nothing (no clicking from low voltage, no grinding, nothing..)

I guess I will be out there tomorrow checking all of the wires between the battery, starter relay and starter motor. There isn't MUCH to it.. and it was working only a couple of weeks ago... but it would help if I had something specific to look for.

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3,120 Posts

Ok guys.. I need some help. What should I check next to fix this?

- Battery is (apparently) good (Tested with engine starter hooked to battery, no dice)
- Accessories, turn signals, etc power up when key is turned
- Starter does nothing (no clicking from low voltage, no grinding, nothing..)

The neutral safety switch perhaps?

97B2500CCV

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1,288 Posts

Check for power to the small wire at the starter when the key is turned to start position. If voltage to that wire on command and battery power to the main wire then you have a starter problem. Unless you installed a new starter it could very well be a failed starter.

Cubey

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655 Posts

Discussion Starter · #8 ·

Okay.. it was a false alarm. The "hot" wire blade connector was pushed out from the harness when I installed it. I took a peak in and saw it there dangling loose. :ugh

At least it didn't cross with anything grounded and create fireworks and crispy wires. I'm a stickler for disconnecting the battery when messing with wiring thankfully. So much so, I should get one of those "easy" disconnect terminals for negative.

After fixing it back in securely, it's now working just fine. It fired right up... then stalled after about 5 seconds. Good ol' carburetors! :D

Thanks for the fast responses guys! :rck:

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Cubey

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655 Posts

Discussion Starter · #11 ·

Oh and I know now... my van lacks EGR. The harness for the relay lacks the wire for EGR.

Posted by: althaalthamikeselles0250791.blogspot.com

Source: https://www.dodgetalk.com/threads/starter-relay-location.373618/

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How to Export a File as a PDF

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PDF is a hugely popular format for documents simply because it is independent of the hardware or application used to create that file. This means it can be viewed across multiple devices, regardless of the underlying operating system. Also, sharing between users is fairly easy. Another key advantage with PDF files is that files from any format can be converted to PDF format without any data loss whatsoever. That's exactly what we'll see in this article too. We will explore the different ways by which you can export a file as a PDF.

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Source: https://www.questionsanswered.net/article/how-to-export-a-file-as-a-pdf?utm_content=params%3Ao%3D740012%26ad%3DdirN%26qo%3DserpIndex

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