Apache Commons lang, logging, HttpClient etc.
Java Commons Collections Framework accelerates the Java applications development, being an empowered data structure. For collection handling, it has now taken a position of standard in Java.
Java Collections provides implementations, new interfaces & utilities. They are built at JDK classes top. List of features of Java Collections is as following: Bag interface consist of various copies for each object.MapIterator is for iteration, on a Map.Interface BidiMap is