Java - Object

Objects are the basic runtime entities in an object oriented system.

  Object is a runtime memory which has the copy of instance members of the class.

  Object can have the memory for instance variables only.

·      A ob = new A();

o        A()- Default constructor

o        new –Memory allocation Operator

Object creation

Object creation can be done in two ways.

·          Memory full state

·          Memory Less State

Memory full state

A ob=new A(); - It is known as object.

ob.get();

Memory less state

A ob; - It is a reference.

ob.get(); 

Here NullPointerException will be raised. Because reference can’t be used to call class members.