Consistent API : The API has a core set of interfaces like Collection, Set, List, or Map, and all the classes (ArrayList, LinkedList, Vector, and so on) that implement these interfaces have some common set of methods.
Cuts programming effort : Instead of worrying about the Collection's design, a programmer may concentrate on how best to use it in his program. As a result, the fundamental principle of Object-oriented programming (i.e. abstraction) has been applied successfully.
Improves program speed and quality by offering high-performance implementations of useful data structures and algorithms, as the programmer does not have to worry about the optimum implementation of a certain data structure in this scenario. They can simply use the best implementation to improve the performance of their program significantly.
