Java Collections Framework provides a well designed set of interfaces and classes that support operations on a collections of objects. The most basic interfaces that reside in the Java Collections Framework are:
Collection, which represents a group of objects known as its elements.
Set, which is a collection that cannot contain duplicate elements.
List, which is an ordered collection and can contain duplicate elements.
Map, which is an object that maps keys to values and cannot contain duplicate keys.
Source: github.com/snowdream
