==> Java is Object Oriented Programming Language
==> Multithread based language

High Level Programming languages ==> 
	categorized into three types:
		1) Structured Programming Languages: C
			Pointers, Structures
		2) Object Based: VB Script
		3) Object Oriented: Java

OOPs ==> Object Oriented Programming System
	class
	object
	method
	constructor
	Destructor
	Encapsulation
	Polymorphism
	Inheritance
	Abstraction
	Access modifiers

check balance{
}

transactions()
{
}

Is Java Strongly Object Oriented Programming Language?
=======================================================
Yes,
because, to write the single line of code in Java, we need to add the class.

Java Program Structure:
=======================

1) Documentation Section
========================
==> improve the readability of the program.
==> Writing comments in the program is called as "documentation".
==> Two approaches:
	Single-line comments ==> //
	Multi-line Comments ==> /* */
==> Suggestable.

Note:
====
Cannot be Executed. (This is non-executable part of the program)
Documentation can write in anywhere of the program.

find biggest number among four integers.
1) define four numbers
2) take first number
3) compare first number with second number
	if first > second
		4) first with third
			first > third
				5) first > fourth
					biggest = first
	if first not > second
		6) second
			second > third
				second > fourth
					biggest = second
			

2) Package Section
==================
collection of classes
keyword: package
==> Optional

whatsapp{
	texting:
		incoming()
		outgoing()
	audio calling()	
	video calling()
	check status
	post status
	transactions
}

Import Section:
===============
==> used to take the data or methods of one module (java file) to another module
==> keyword: import
==> optional

Pi = 3.1416
import math.pi
class{

met1()
{
	area
}
met2(){
	circumference
}
}

class Section:
==============
==> mandatory.
==> keyword: class
Syntax:
	class class-name{
		attributes
		methods
	}
==> class as the collection of attributes (data) and methods

Special method:
===============
main()
	describe where the java program has start and where it can end.
Syntax:
	public static void main(String[] args)
	{
	}

// This is the First Program in Java
/*
	I am using Notepad as a text editor
	and I can run my first java program 
	in my computer using command prompt.
*/
class firstClass{
	public static void main(String[] args)
	{
		System.out.println("Hello World!");
	}
}

Writing of Java Program:
========================
Text Editor: Note pad
====================
1) open the notepad
2) title the file (java file)
	java file must be having the extension with ".java"
Syntax:
	title/file-name.java
3) We have written the comments into the java file

Compile the Java Program:
==========================
1) start the command prompt
2) we need to navigate (get the java file path) the java file
	using "cd" command
Syntax:
	cd file-path-location
3) Compile the java file
	using "javac" command
Syntax:
	javac file-name.java

Run the Java program:
=====================
==> to run the java program,
	we can use java" command
Syntax:
	java file-name