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Implementations are the actual data objects used to store collections, which implement the core collection interfaces described in the previous lesson. The sections that follow describe three kinds of implementations:Additionally, you can build your own implementations, based on the JDK's abstract implementations. This is described in a separate lesson because it's an advanced topic. It's not particularly hard, but relatively few people will need to do it.General-purpose Implementations
General-purpose implementations are the public classes that provide the primary implementations of the core collection interfaces.Wrapper Implementations
Wrapper implementations are used in combination with other implementations (often the general-purpose implementations) to provide added functionality.Convenience Implementations
Convenience implementations are mini-implementations, typically made available via static factory methods that provide convenient, efficient alternatives to the general-purpose implementations for special collections (like singleton sets).
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