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Uma coleção (collection) é uma estrutura de dados que serve para agrupar muitos elementos em uma única unidade, estes elementos precisão ser Objetos.

Part 2 explores type dependency in the Java Collections API, in generics, and in lambda expressions. We’ll jump right in, so if you haven’t already read Part 1, I recommend starting there.

Guava brings filtering and transformation on collections to standard Java and that is the subject of this post. Topics ... but you won’t find that class in the Guava API documentation.

Apache Collections supports generics, so that's not a reason to choose one over the other. If the collections you need are available in it, I'd probably lean towards Guava, though.