Dear EE
if you please find attached document contains 2 digrams
I am a new learner in UML and Class Diagram
I am very confused about the different between:
This is what I got from my suffering in the internet
1. Aggregation:
a. Student Studies Course
b. In the simplest terms, a relationship between two classes is shown by a line
c. The line connecting the two classes has an arrow to indicate the 'direction' of the ASSOCIATION.
d. The links shown above is an example of a 'named association'; it is the most general kind of link.
e. Book, that is, a library member can borrow up to six books. At the same time, a book can only be on loan to one member.
f. One-many
g. Many-many
2. Association:
a. IS Part OF
b. An Army is an aggregate of one or more soldiers and one or more weapons''. The aggregation is LOOSE expressing a whole-part relationship between the army and its constituents.
c. Master detail
d. Parent Child
My Question is here:
1. What is the different between Master Detail and Parent to Child?
Please advise me, I am so confused.
Thank you,
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It is perfectly fine to seek clarifications until you have understood the solution ... I would be glad to assist you in the process.
Association is simply a relationship ... it can be one to many or one to n or anything else ... its just a relationship
Aggregation can be thought of a special kind of association or a special kind of relationship in which smaller components make up the bigger entity ....
e.g. nuts, bolts, widgets make up an engine
departments make up a college
line orders make up an order
If the main entity does not exist, smaller entities do not make sense ...
If there is no engine, nuts, bolts and widgets dont relate - or mean anything
departments dont make sense if there is no college
Line order does not hold any significance if there is no order.
Aggregation can be interpreted literally here ... Smaller things are "part of" larger thing or they aggregate together to make a larger thing ...
I was off the mark in saying "If the main entity does not exist, smaller entities do not make sense ... "
Smaller entities can still exist ... If smaller entities get destroyed if larger object is destroyed, then the relationship is called composition ...
Again to be clear
Association - relatoinship ... Doctor - patient
Aggregation - "part of" relationship - smaller objects can exist even if larger object is destroyed. Widgets - engine
Composition - "composed of" relationship - smaller objects cease to exist if larger object is destroyed. Departments - college
First, I want to thank you for the good worlds you said to me, thank you so much.
I am starting to understand:
Let me tell you what I understood from you:
1. Aggregation:
a. Small components are related to each other to make bigger entity
b. Example:
i. If I want to make class diagram from CAR
ii. Then I will have a class for
1. Engine
2. Doors
3. Tires
4. Etc..
iii. And I will relate them all with a class CAR
c. Please correct me if I am wrong.
Small question what is the different between component and entity?
thank you Again
Your example of car is bang on target - car is an aggregation of engine, doors etc.
Component and entity are often used interchangeably .. component implies that the object is a part of a bigger thing - a component ... on the other hand entity does not impy any such relationship - anything and everything could be an entity.
if you please i did attach the class diafram i did in image format
can you see it and tell me your comments
i am very thankful for all your replies
thank you
if you dont mind i would like to be friends:<email-id edited out by sunnycoder>
Class-Diagram.jpg
Hi RamyBouchra,
1. You should not be posting your email-id in the threads. It can be harvested by bots and you will get loads of spam.
I would like to be friends but please realize that technical discussions shall still be kept on the site. My contact info is in my profile. You can access my profile by clicking on my username. I am editing out your mail-id from your post.
2. You should be opening separate threads for separate questions. At the same time also manage your open questions.
http://www.experts-exchang
sunnycoder
In that case please ask a new question and post the picture in that question. This would serve you better. There might be some experts who browsed your question and having seen it answered left it. They may have some constructive inputs for this new problem.
Posting a separate question for each different problem (not followup or clarifications but different problems) would get you better attention and responses.
Business Accounts
Answer for Membership
by: sunnycoderPosted on 2008-05-05 at 00:19:13ID: 21498536
Master details means one big item (master) which has smaller items (details) ... e.g. a sales order is a master and a line item in the order is a detail ... Detail has no life or meaning outside master ... Master may have several details.
Parent child as the name indicates is a generalization relationship ... e.g. soldier, doctor, engineer, student are all kinds of people
http://en.wikipedia.org/wi