Java Collections Framework is a set of re-usable data structures and algorithms.
The Java Collections Framework provides common data structures implementations which are enough for general-purpose such as list, set, map, queue, tree, etc. These collections are high-performance, high-quality, and easy to use with very good documentation.
In addition, the Java Collections Framework provides useful and robust algorithms such as searching and sorting on collections, and the interoperability between collections and arrays
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