Collection framework in Java provides a set of readily usable efficient implementations for commonly used data structures and algorithms. A basic understanding of the data constructs like arrays, String, linked list, stack, queue and trees, and concepts like hashing, will help you understand collections better. Collections are often used along with the Generics feature to provide reusable and type safe implementations for these data structures and algorithms.
Streams are an important introduction in Java 8 and follows the pipeline model and lazy initialization. It also enables out of the box parallelization support. We will also see Java 8 collection improvements.
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