Java Core - Generics and Collections

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.

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It depends what you mean by "functional programming" and by "possible".

You can obviously implement things following a functional paradigm. However the Java language doesn't provide the syntactic sugar for it, so some things will be tedious at best, and some other ones will be extremely arcane.Exltech

We know that the Core Java is Oracle's refer and defined into the subset of Java SE technologies. It is not related to the Java programming itself, but also it is rather than the set of some fundamental packages. As a resultant, it affects development approaches. 

Nowadays, this Java Core is represented as the following sets.

  • Fundamental technologies
  • CORBA
  • Hotspot VM
  • Tools API
  • XML
  • Application management and monitoring

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