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Java collection class comparison table

Subject	be	consist of	have methods	have purpose	use
ArrayList	abstract if it has one or more abstract methods		set, add and remove	to allow you to build collections of objects that grow as more objects are added	iterator methods for doing something with every member of the collection
LinkedList	more efficient than ArrayList and Vector for operations such as inserting an element in the middle			working with collections of objects	iterator methods for doing something with every member of the collection
String	abstract if it has one or more abstract methods	a collection of characters		working with collections of objects	zero-based indexing
Vector	abstract if it has one or more abstract methods			working with collections of objects	iterator methods for doing something with every member of the collection

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