Selenium Tutorial For Beginners 7|Java Program Structure with an Example|G C Reddy|

Java Programming for selenium, Java programming Syntax, Sections of Java Program, Documentation section in Java Programs, Import Statements in Java, Java Class Statement, Java main method, Creating methods, and code blocks.
Java Sample Program Example with Comments, Declaring variables, Constants, and Methods. Java Code examples with conditional statements, Loop Statements, and Calling Methods.

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Selenium Class 7: Java Program Structure with an Example

i) Java Program Structure
ii) Java Program Example

i) Java Program Structure

1) Documentation Section

> It includes the comments to tell the program's purpose. It improves the
readability of the program.

2) Package Statement

> It includes statement that provides a package declaration.

3) Import Statement/s

We import Predefined and user defined libraries using "import" Keyword

ex:

import java.io.Console;

java - Project Name
io - Package
Console - Class Name

import java .io.*;
java - Project
io- Package
io.* - import all classes from io package

4) Interface Section

> It includes method declaration.

5) Class Declaration

Ex:
public class Sample{
}

public - Access Modifier
class - Java Keyword to declare class
Sample - Class Name

6) main Method (Java Program Execution Starts from main method)

public static void main (String [] args) {
Code...
}

public - Access Modifier
static Non -Access Modifier (use main method without invoking any object)
object.method();
object.method(val1, val2);

void - Returns nothing
main - Method name

(String [] args) - ?

7) Declaration Statements

We declare Variables and Constants

int a;
a=10;

int b, c, d;
b=20, c=30, d=40;

int f=60, g=70, h=80;

final int y;
y=100; //Incorrect

final x = 200; //Correct

Variables vs. Constants

int a=10;



a=20;


a=10;

final int b=100;


b=200; //Incorrect

8) Normal Statements

System.out.println("Hello Java");
System - Predefined Class
out - Object
println - Method
"Hello Java" - Message

a+b = d;

9) Code Blocks

Conditions, Loops, Methods....

10) Object Creation Statement, etc...

Syntax:
ClassName objectName = new ClassName();

ii) Java program Example

//Note: We declare User defined Methods before the main method and call those
methods after the main method

Java Methods
Predefined
User Defined
Non -Static Methods (Method with Retuning Value, Method Returns Nothing)
Static Methods (Method with Retuning Value, Method Returns Nothing)

//It is a Sample Program to Understand the Java Syntax and Program Structure
package abcd;
public class JavaProgram {
//Create a Method with Parameters and Return value (Non Static Method)
public int add(int a, int b){
int result;
result = a + b;
return result;
}
//Create a Method without Parameters and Returns Nothing (Non Static Method)
public void Comparison(){
int a =100, b=50;
if (a>b){
System.out.println("A is a Big Number");
}
else{
System.out.println("B is a Big Number");
}
}
//Create a Method with Parameters and Return value (Static Method)
public static int sub(int a, int b){
int result = a-b;
return result;
}
//Create a Method without Parameters and Returns Nothing (Static Method)
public static void comparison2(){
int a =100, b=500;

if (a > b){
System.out.println("A is a Big Number");
}
System.out.println("B is a Big Number");
}

public static void main(String[] args) {
int a; //Variable Declaration
a=10; //Initialization
int b=20; //Variable Declaration with Initialization
int c, d, e; //Declaring Multiple Variables
int f=40, g=50, h=60; //Declaring multiple Variables with Initialization

double l =12.3456;
char m= 'Z';
boolean x = true;
String y = "Selenium Testing";

System.out.println(y); //Selenium Testing

System.out.println("Hello Java");//Hello Java

int z = a+b;
System.out.println("Value of the z Variable is: "+ z);// Value of z Variable is: 30

final int abc =100;//Declare Integer Type Constant
System.out.println(abc);//100

if (a > b){
System.out.println("A is a Big Number");
}
else
{
System.out.println("B is a Big Number");
}//B is a Big Number

char grade ='A';
switch (grade) {//Decide among several alternates
case 'A':

break;

case 'B':
System.out.println("Good");
break;

case 'C':
System.out.println("Better");
break;

default:
System.out.println("Invalid Grade");
}//Excellent
//Print 1 to 5 Numbers except 4th number
for (int i = 1; i <=5; i++){
if (i != 4){
System.out.println(i);
}
}

int j =1;
while (j <=10){
System.out.println(j);
j++;
}

int n =1;
do
{
System.out.println(n);
n++;
} while (n<=5);

String [] tools = {"Selenium", "UFT", "RFT", "SilkTest"};

for (String xyz: tools){
System.out.println(xyz);
}
//Create Object in order to access /call Non-Static Methods

JavaProgram smriti = new JavaProgram();
//Call Non-static methods

int r = smriti.add(10, 20);
System.out.println(r);//30
System.out.println(smriti.add(10, 20));//30

smriti.Comparison();//A is a Big Number

//Class Static Methods
int r2= JavaProgram.sub(18, 11);
System.out.println(r2);//7
System.out.println(JavaProgram.sub(18, 11));//7

JavaProgram.comparison2();//B is a Big Number

comparison2();//B is a Big Number
}
}