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Understanding type compatibility is fundamental to writing good Java programs, but the interplay of variances between Java language elements can seem highly academic to the uninitiated. This two-part article is for software developers ready to tackle the challenge! Part 1 revealed the covariant and contravariant relationships between simpler elements such as array types and generic types, as well as the special Java language element, the wildcard. 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.

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