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Trail: Collections

This section describes the Java Collections Framework. Here, you will learn what collections are and how they can make your job easier and programs better. You'll learn about the core elements — interfaces, implementations, aggregate operations, and algorithms — that comprise the Java Collections Framework.

Introduction tells you what collections are, and how they'll make your job easierand your programs better. You'll learn about the core elements thatcomprise the Collections Framework:interfaces,implementationsandalgorithms.

Interfaces describes thecore collection interfaces, which are the heart and soulof the Java Collections Framework. You'll learn general guidelines foreffective use of these interfaces, including when to use which interface.You'll also learn idioms for each interface that will help you get the mostout of the interfaces.

Aggregate Operations iterate over collections on your behalf, which enable you to write more concise and efficient code that process elements stored in collections.

Implementations describes the JDK'sgeneral-purpose collection implementationsand tells you when to use which implementation. You'll also learn aboutthewrapper implementations, which add functionality to general-purposeimplementations.

Algorithms describes thepolymorphic algorithms provided by the JDK to operateon collections. With any luck you'll never have to write your own sortroutine again!

Custom Implementations tells you why you might want to write your own collection implementation(instead of using one of the general-purpose implementations provided by theJDK), and how you'd go about it. It's easy with the JDK'sabstractcollection implementations!

Interoperabilitytells you how the Collections Framework interoperates with older APIs thatpredate the addition of Collections to Java. Also, it tells you how to designnew APIs so that they'll interoperate seamlessly with other new APIs.