As a rule of thumb: class Person { private Heart heart; private List<Hand> hands; } class City { private List<Tree> trees; private List<Car> cars } In composition (Person, Heart, Hand), “sub objects” (Heart, Hand) will be destroyed as soon as Person is destroyed. In aggregation (City, Tree, Car) “sub objects” (Tree, Car) will NOT be … Read more
Hope this helps. It describes the various types of factories. I used the Head First Design Patterns book as my reference. I used yuml.me to diagram. Static Factory Is a class with a Static Method to product various sub types of Product. Simple Factory Is a class that can produce various sub types of Product. … Read more
ObjectAid UML Explorer Is what I used. It is easily installed from the repository: Name: ObjectAid UML Explorer Location: http://www.objectaid.com/update/current And produces quite nice UML diagrams: Description from the website: The ObjectAid UML Explorer is different from other UML tools. It uses the UML notation to show a graphical representation of existing code that is … Read more
Extend is used when a use case adds steps to another first-class use case. For example, imagine “Withdraw Cash” is a use case of an Automated Teller Machine (ATM). “Assess Fee” would extend Withdraw Cash and describe the conditional “extension point” that is instantiated when the ATM user doesn’t bank at the ATM’s owning institution. … Read more
For two objects, Foo and Bar the relationships can be defined Association – I have a relationship with an object. Foo uses Bar public class Foo { private Bar bar; }; NB: See Fowler’s definition – the key is that Bar is semantically related to Foo rather than just a dependency (like an int or … Read more