Introduction to Java.md

Introduction to Java

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Introduction

• Java is a programming language and a platform.
• Java is a high level, robust, object-oriented and secure programming language.
• Java was developed by Sun Microsystems (which is now the subsidiary of Oracle) in the year 1995.
• James Gosling is known as the father of Java.

Key Features

• Object-Oriented
• Platform Independence
• Robust and Secure
• Multithreaded
• Rich API

Java Platform / Editions

• Java SE (Java Standard Edition) - Stream, Networking, AWT, Swing, Reflection, Collection
• Java EE (Java Enterprise Edition) - Servlet, JSP, Web Services
• Java ME (Java Micro Edition) - Mobile applications
• JavaFX - Rich internet applications.

Basic Concept of OOPs are

• Object
  • An entity that has state and behaviour is known as object.
  • Object are the instance of class.
• Class
  • A Class is a group of objects which have common properties.
  • It is a logical entity.
• Inheritance
• Polymorphism
• Abstraction
• Encapsulation

Four pillar of OOPs

Inheritance , Polymorphism , Abstraction , Encapsulation

Operators

Operator Type	Catrgory	Precendance
Unary	postfix	expr++ expr--
	prefix	++expr --expr +expr -expr ~ !
Arithmetic	prefix	* / % + -
Shift	shift	<< >> >>>
Relational	comparison	< > <= >= instanceof
	equality	== !=
Bitwise	bitwise AND	&
	exclusive OR	^
	inclusive OR
Logical	logical AND	&&
logical	OR
Ternary	ternary	? :
Assignment	assignment	= += -= *= /= %= &= ^=

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public class demo {

    public static void main(String[] args) {

        System.out.println("Saurabh Bahadur");

    }
}

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• Basic

• Introduction to Java

• Array

• Time and Space Complexity

• Sorting

• String

• Recursion

• OOPs

• Linked List

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