Introduction to Java

Introduction to Java

i) Introducing Java Programming Language

ii) Java Environment Setup

iii) Java Program Structure/Java Syntax
i) Introducing Java Programming Language

> Java Programming Language was developed by Sun Microsystems in 1995, Now it is subsidiary of Oracle corporation.

> Java is an Object Oriented Programming Language, In Java everything is object, Java can be easily extended since it is based on the object model.

> Java is a Platform independent language, It can be compiled and interpreted.

> Java is Simple easy to learn and implement.

> Java is Securable, Using Java we can develop virus free and tamper free systems.
Usage of Java
> Developing Desktop Applications (Ex: Acrobat Reader)

> Developing web Applications

> Developing Enterprise Application (Ex: Banking, Insurance Applications etc...)

> Developing Mobile Applications

> Developing Embedded Systems.

> Smart Cards

> Games software etc...
> Test Automation
Java Syntax Rules
> Java is case sensitive language

> First letter of Class Name should be in Upper case

> Method names should start with lower case letter.

> Java program file name should exactly match with class name.

> Java Program execution starts from main method, which is mandatory in every Java program.

> Every Statement should end with semi colon symbol.

> Code blocks enclosed with {}
ii) Java Environment Setup

> Download Java Software (JDK) and Install.

> Set Environment Variable (Path Variable).

> Download Eclipse IDE and Extract.
In Computer Programming we have Three steps
i) Writing a Program.

ii) Compiling the Program

iii) Run /Execute the Program

Step 1: Writing a Program.
public class Sample{
public static void main(String [] args) {
System.out.println ("Hello Java World");
Step 2: Compiling the Program
Change to Java program file directory.

Type javac

(* it creates Java class file)
Step 3: Run /Execute the Java program
Type java Sample
In Test Automation using Selenium, we use an Integrated Development Environment (IDE) like
Eclipse IDE.

> Eclipse IDE (Integrated Development Environment)

> Eclipse IDE is a platform to create and Run /execute programs like Java, Perl, Python,
Ruby, PHP etc...

> Eclipse IDE is open source (eclipse Public License)

It provides Editor, help for Syntax, context help, auto compilation, debugging etc....
Download Eclipse IDE and Extract.
Write and Execute a Java program using Eclipse IDE


> Launch Eclipse IDE

> Create Java Project

> Create Java Package

> Create Java Class

Write Java code in the Class file and Run


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