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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