Java -Collection part -1 ArrayList

Collections in java is a framework that provides an architecture to store and manipulate the group of objects.

Collection represents a single unit of objects i.e. a group.

Collection framework represents a unified architecture for storing and manipulating group of objects. It has:

1. Interfaces and its implementations i.e. classes

2. Algorithm

Let'us Divide into collection from very Basic ............. how to create collection

Above Program show a very basic implementation of collection.

Know Lets dig more into it with some more examples

• JAVA ARRAYLIST

Java ArrayList class uses a dynamic array for storing the elements. It inherits AbstractList class and implements List interface.

The important points about Java ArrayList class are:

• Java ArrayList class can contain duplicate elements.

• Java ArrayList class maintains insertion order.

• Java ArrayList class is non synchronized.

• Java ArrayList allows random access because array works at the index basis.

• In Java ArrayList class, manipulation is slow because a lot of shifting needs to be occurred if any element is removed from the array list

Below is an implementation of ArrayList

#collections #arraylist #linkedlist #iterator #diffeenceinarraylistandector