Collections
A collection is an object that represents a group of objects. You can use collections to represent relationships among objects. These relationships can be between one object and another object (one-to-one), one object and many other objects (one-to-many), or many objects and many other objects (many-to-many). A simple array can be used to represent a one-to-one relationship. Special collection classes are essential when you want to represent one-to-many and many-to-many relationships.
Collections can be gathered together in many different ways. The way you represent a collection of objects largely depends on the kinds of objects you're collecting and what you want to do with them. There are five types of collections available in ...
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