Selenium 9: Java Program Structure

Java Programming for Selenium, Java Programming Structure with an Example, Divisions of Java Program, Documentation in Java, Package Declaration in Java program, Class Declaration, Import Statement, main method in Java Programs, Declaring variables & Constants in Java, Writing conditional and Loop Statements in Java, and Declare methods & Call Methods in Java Programs.

[gcreddy]

Class Notes:
Selenium Class 9: Java Program Structure

i) Java Program Structure
ii) Java Program Example

i) Java Program Structure

1) Documentation Section
2) Package Declaration Statement
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) Class Declaration

Ex:
public class Sample{
}

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

5) 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) - Jyothi

6) 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

7) Normal Statements

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

a+b = d;

8) Code Blocks

Conditions, Loops, Methods....

9) 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
}
}

[davidprasad]

Thank you for this < Java Program Structure >.