Introduction to Java

Introduction to Java

i) Introducing Java Programming Language

ii) Java Environment Setup

iii) Java Program Structure/Java Syntax
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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.
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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...
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> Test Automation
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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 {}
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ii) Java Environment Setup
Steps:

> Download Java Software (JDK) and Install.

> Set Environment Variable (Path Variable).

> Download Eclipse IDE and Extract.
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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");
}
}
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Step 2: Compiling the Program
Change to Java program file directory.

Type javac Sample.java

(* it creates Java class file)
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Step 3: Run /Execute the Java program
Type java Sample
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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....
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Download Eclipse IDE and Extract.
Write and Execute a Java program using Eclipse IDE

Steps:

> 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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2 comments:

Sir can i get ur email id, actually i followed all the steps told by you in the tutorial, but still when i type javac and enter in cmd, it is giving error, dunno why, have installed jdk and also set the correct path in the env variable.

Jayasri, you must set path after installing java

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