WHAT IS JAVA ?

JAVA

• The definition of JAVA is simply defined as:- "A programming language that is used for developing software and delivering content on the web."
• It is similar to C/C++.
• It is represented by .java extension for the compilation.
• The source code files are compiled into a format called bytecode, which can then be executed by JAVA Interpreter. 
• There are more than 9 million JAVA developers worldwide and more then 3 million mobile phones run JAVA.
• The latest version of JAVA was launched in 2014 having name "JAVA SE 8".
• Oracle acquired Sun Microsystems in January, 2010. Therefore, Java is now maintained and distributed by Oracle.
•  Java is also known for being more strict than C++, meaning variables and functions must be explicitly defined.
• It is clearly mean that java source code may produce errors or "exceptions" more easily than other languages.
• But it also limits other types of errors that may be caused by undefined variables or unassigned types.
• Basically, Java is:- object oriented, robust, platform independent, secure, simple, portable, interpreted, distributed, dynamic, high performance and multithreaded.

Illustration

1. class Simple{
2. public static void main(String args[]){
3. System.out.println("Hello Java");
4. }
5. }

Application

• MOBILE APPLICATION:- The reason for Java being the language for android development is that android applications use Dalvik Virtual Machines

• DESKTOP GUI APPLICATION:- GUI such as window panes, toolbars to create fluid and responsive interfaces for the users.

• WEB BASED APPLICATION:- Java has inbuilt packages such as Servlets,Struts and JSPs. These packages are easy to code in and grasp at the same time.

• ENTERPRISE APPLICATION:- Java Enterprise Edition is a very popular platform that provides API and runtime environment for scripting.

• SCIENTIFIC APPLICATION:- These programs are designed to be highly secure and lighting fast. they support a higher degree of portability and offer low maintenance.

• GAMING APPLICATION:- It has the unparalleled capability when it comes to the designing of 3D games.

• BIG DATA TECHNOLOGIES:- It is crystal clear that Java is the backbone when it comes to developing big data using java.

• BUSINESS APPLICATION:- These applications are designed to solve the problems encountered by large enterprises.

• DISTRIBUTED APPLICATION:- One integral part of Jini is JavaSpaces, a mechanism that supports distribution, persistence, and migration of objects in a network.

• CLOUD-BASED APPLICATION:-  Java provides you with features that can help you build applications meaning that it can be used in the SaaS, IaaS and PaaS development.

Example :

Java Programme for A Simple Calculator :

package calculator;

public class Calculation {
	int result;
	//Method for addition
	public int add(int num1, int num2){
		result = num1+num2;
		return result;
	}
	//Method for subtraction
	public int substract(int num1, int num2){
		result = num1-num2;
		return result;
	}
	//Method for multiplication
	public int multiply(int num1, int num2){
		result = num1*num2;
		return result;
	}
	//Method for division
	public float divide(int num1, int num2){
		result = num1/num2;
		return result;
	}
	
}

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