One of the frequent question related to Java is whether Java a pure object oriented language or not is often asked in an interview. The answer is NO. There are many things in Java which are not objects e.g. primitive data types like boolean, int, float etc., different kinds of arithmetic, logical and bitwise operator e.g. +, -. *, /, &&, || etc. Few pure OO languages are
Smalltalk and
Eiffel. Though Java is one of the most successful Object oriented programming language, which also got some functional programming touch in Java 8 is never considered 100% or pure object-oriented programming language. If it were, all its primitives would be objects. It actually moves half-way in this direction with String and Array, but it doesn't quite go far enough.
There are seven qualities to be satisfied for a programming language to be pure Object Oriented.
- Encapsulation/Data Hiding
- Inheritance
- Polymorphism
- Abstraction
- All predefined types are objects
- All operations are performed by sending messages to objects
- All user defined types are objects.
Java supports Encapsulation at class and package level, It supports Abstraction, Inheritance and Polymorphism, and all user defined types are also objects. What it doesn't support is #5 and #6.
Why Java is not Pure Object Oriented language?
Smalltalk is often considered one of the purest Object oriented language and comparing Java with Smalltak will give sufficient reasons, why Java is not pure OO language.
- Primitive data types are either stored directly in fields or on the stack rather than on the heap.
- "Primitive types" in Smalltalk are actually "Primitive Classes" and in Smalltalk all "procedures" or "functions" are really messages
Though you can make your program pure object oriented by using Autoboxing, but Java compiler supports primitive data types, so Java cannot be Pure OO unless it makes everything objects.
Today I will show you how you can implement Bankers algorithm in Java. The Banker's algorithm is a resource allocation and deadlock a...
Today I am going to show how to convert a postfix expression to an infix expression using stack in Java. In an earlier post here we ...
Today in this article I will tell you how to convert an infix expression to postfix expression using stack. This is an important applicat...
--------------------UPDATE------------------- I have updated my post so that now it can detect IE 11. This modification was necessary as t...
Today I am going to show you how you can generate and validate captcha. A CAPTCHA (an acronym for "Completely Automated Public Turin...
Today I am going to post a program that will be able to produce all the mColorings of a given graph G. What is mColoring : The problem st...
Today in this article I will show you how to create or develop a Tower of Hanoi game in Java. The Tower of Hanoi is a famous problem tha...
0 comments:
Post a Comment