Aggregation v s composition
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Aggregation and composition are types of associations in UML. Aggregation represents a whole-part relationship where the part can exist independently of the whole. Composition is a stronger form where the part cannot exist without the whole and is destroyed when the whole is destroyed. The key difference is that in aggregation the part may continue existing after the whole is destroyed, but in composition the part is destroyed along with the whole.
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ูุฒู
ุฉ (ููู ููู
ุฉ !!!!)
#ููู
_ู
ุงูู_ุฏุฑุฎ
3- ุฏูุฉ ุงููุชุงุจุฉ ูุงูุตูุฑ ุนุงููุฉ ุฌุฏุงู ุฌุฏุงู ุฌุฏุงู
4- ูููุงูู ุจุนุถ ุงูู
ุนููู
ุงุช ุชู
ุชูุถูุญูุง ุจุดูู ุชูุตููู ุฌุฏุงู (ุชูุนุชุจุฑ ูุฏู ุงูุทุงูุจ ุฃู ุงูุทุงูุจุฉ ุจุฅููุง ู
ุนููู
ุงุช ู
ูุจูู
ุฉ ูู
ุน ุฐูู ุชู
ุชูุถูุญ ูุฐูู ุงูู
ุนููู
ุงุช ุงูู
ูุจูู
ุฉ ุจุดูู ุชูุตููู ุฌุฏุงู
5- ุงูู
ูุฒู
ุฉ ุชุดุฑุญ ููุณูุง ุจ ููุณูุง ุจุณ ุชููู ุชุนุงู ุงูุฑุงูู
6- ุชุญุชูู ุงูู
ูุฒู
ุฉ ูู ุงูู ุณูุงูุฏ ุนูู ุฎุงุฑุทุฉ ุชุชุถู
ู ุฌู
ูุน ุชูุฑูุนุงุช ู
ุนููู
ุงุช ุงูุฌูุงุฒ ุงูููููู ุงูู
ุฐููุฑุฉ ูู ูุฐูู ุงูู
ูุฒู
ุฉ
ูุงุฎูุฑุงู ูุฐูู ุงูู
ูุฒู
ุฉ ุญูุงูู ุนูููู
ูุฅุชู
ูู ู
ููู
ุฅู ุชุฏุนููู ุจุงูุฎูุฑ ูุงูุตุญุฉ ูุงูุนุงููุฉ ููุท
ูู ุงูุชูููู ุฒู
ูุงุฆู ูุฒู
ููุงุชู ุ ุฒู
ูููู
ู
ุญู
ุฏ ุงูุฐูุจู ๐๐
๐ฅ๐ฅ๐ฅ๐ฅ๐ฅ๐ฅ๐ฅ๐ฅ๐ฅ
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Aggregation v s composition
- 1. BY: Sayed Farhan Ali Shah Roll. No: 39 I.T โ 5th Semester Shah Abdul Latif University Khair pur Mirโs Sindh Pakistan
- 2. โข Aggregation is a stronger form of association โข An association is a link connecting two classes. โข This is special type of association used for modelling ๏ง In UML, a link is placed between the โwholeโ and the โpartsโ classes with a diamond head attached to the โwholeโ class to indicate that this association is an aggregation
- 3. โข Composition is really a strong form of aggregation โข Composition have only one owner โข Composition cannot exist independent of their owner โข Composition live or die with their owner โข It is represented using a filled diamond head
- 4. โข The main differentiator between aggregation and composition is the lifecycle dependence between whole and part. โข In aggregation, the part may have an independent lifecycle, it can exist independently. When the whole is destroyed the part may continue to exist. โข Composition is a stronger form of aggregation. The lifecycle of the part is strongly dependent on the lifecycle of the whole. When the whole is destroyed, the part is destroyed too.
- 5. Aggregation Example A car has many parts. A part can be removed from one car and installed into a different car. If we consider a salvage business, before a car is destroyed, they remove all saleable parts. Those parts will continue to exist after the car is destroyed.
- 6. Composition Example For example, a building has rooms. A room can exist only as part of a building. The room cannot be removed from one building and attached to a different one. When the building ceases to exist so do all rooms that are part of it.