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interface specifies the functionality of a set, which is a collection of unique (ie, non-duplicate) elements Several classes, such as ArrayList, HashSet, and LinkedList, provide concrete implementations of the collection interfaces These concrete implementations provide offthe-shelf solutions to most data storage and retrieval tasks Algorithms are static methods defined within the Collections class that operate on collections For example, there are algorithms that search, sort, or reverse a collection In essence, algorithms provide a standard means of manipulating collections When working with a collection, you will often want to cycle through its elements One way to do this is with an iterator, which is defined by the Iterator interface An iterator offers a general-purpose, standardized way of accessing the elements within a collection, one at a time In other words, an iterator provides a means of enumerating the contents of a collection Because each collection implements Iterator, an iterator can be used to cycle through the elements of any collection class Another feature defined by the Collections Framework is the map A map stores key/ value pairs Although maps are part of the Collections Framework, they are not collections in the strict use of the term because they do not implement the Collection interface You can, however, obtain a collection-view of a map Such a view contains the elements from the map stored in a collection Thus, you can process the contents of a map as a collection, if you choose
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As you may know, the Java language underwent a substantial change when several new features were added by Java 5 Three of these features had a profound effect on the Collections Framework: generics, autoboxing, and the for-each style for loop Although these features are now a well-established part of Java programming, not all programmers are aware of how much they have impacted collections Because the recipes in this chapter make use of these features, a brief discussion is warranted With the release of Java 5, the entire Java API, including the Collections Framework, was reengineered for generics As a result, today all collections are generic, and many of the methods that operate on collections take generic type parameters Generics improve collections by adding type safety Prior to generics, all collections stored Object references, which meant that any collection could store any type of object Thus, it was possible to accidentally store incompatible types in a collection Doing so could result in runtime type mismatch errors With generics, the type of data being stored is explicitly specified, and runtime type mismatches can be avoided Autoboxing/unboxing facilitates the storing of primitive types in collections A collection can store only references, not primitive types In the past, if you wanted to store a primitive type in a collection, you had to manually box it into its type wrapper For example, to store an int value, you needed to create an Integer object that contained that value When the value was retrieved, it needed to be manually unboxed (by using an explicit cast) into its proper primitive type Because of autoboxing/unboxing, Java can now automatically perform the proper boxing and unboxing needed when storing or retrieving primitive types There is no need to manually perform these operations This makes it much easier to store primitive types in a collection All collection classes now implement the Iterable interface This enables a collection to be cycled through by use of the for-each style for loop In the past, cycling through
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a collection required the use of an iterator Although iterators are still needed for some uses, in many cases, iterator-based loops can be replaced by for loops
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R EMEMBER Because the code examples in this chapter make extensive use of these newer features,
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