Selenium Class 5 - Java Environment Setup

https://www.gcreddy.com/2019/06/java-environment-setup-2.html
Uses of Java, Java Syntax Rules and Java Environment Setup & Verify

1.Uses of Java
Desktop Applications
Web Applications
Enterprise Applications (Ex: Banking, Insurance, ERP etc,)
Mobile Applications
Embedded Systems
Smart Cards
Games Software
Scientific Applications etc,

*Test Automation / Automated Testing (with Selenium)

2. Java Syntax Rules

i. Java is a case sensitive language
Note: All Java keywords and reserved words are small lettters

keywords - if, for, main, do, while, import, extends etc,
Reserved words - true, false, null etc,

ii. First letter of Java class name should be in upper case

sample //Incorrect
Sample //Correct
Firstprogram //Correct
FirstProgram //Correct

iii. Java method names should start with lowercase

iv. Java program file name should exactly class name

v. Java program execution strats from "main" method, which is mandatory in every Java Program

vi. Every Statement / Step should end with (;)

vii. Code blocks (condition, loop, method etc, ....enclosed with {}

viii. Java supports Explict declaration of Data types

in Java,
int sno =123;
sno=10.234;//Incorrect
int x;
x=100;

char a='Z';

boolean c= true;

in VBScript,
Dim x
x="India"
.
.
x= 100
.
x=1.23
.
.
x=#10/10/2010#

ix. Java supports Explicit decartion of Variables

in Java
int a, b;
a=10;
b=20;
c=30; //Incorrect

in VBScript,
Dim a
a=100
b=200

3. Java Environment Setup & Verify

To write & execute Java programs then Java Environment is required

Three important steps in Computer programming

i. Write a Program (in any editor)
ii. Compile the Program
iii. Run the Program

A. Steps for writing and executing Java Programs using command line interface

i. Download Java (JDK) and Install
ii. Set Java environment in OS environment
iii. Write a Java program in Notepad and save with ".java" extension
iv. Compile the Java Program
v.Run the Java program

B. Steps for writing and executing Java Programs using Eclipse IDE

i. Download Java (JDK) Software and Install
ii. Set Java environment in OS environment
iii. Download Eclipse IDE & Extract the software
iv. Write Java programs in eclipse ide editor & run

Eclipse IDE:

. Eclipse IDE is a platform to write & execute computer programs like C, C++, Java,
Perl, Python and PHP etc,

. Eclipse IDE is an Open source software

. It provides,
Editor for writing programs,
Syntax guidance,
context help,
Auto compilation etc,