Selenium component overview with detailed concepts on java

1. Why Automation?
Test Automation->A software tool to run test cases
repeatedly against the application.
To check the correct whether the application is
behaving as expected or not.
EX: Regression Testing.
Test Automation Supports:
Regression testing.
Finding defects missed by manual testing
Disciplined documentation of test cases.

2. When not to automate?
• We should not use the automation tool when
the UI or web application behavoiur keeps
changing like when the application behaviour
is not stable.
• If an application has a very tight deadline,
there is currently no test automation
available.

3. Selenium Overview
• Selenium is a portable software testing
framework for web applications.
• Selenium provides a record/playback tool for
authoring tests without learning a
test scripting language(Selenium IDE)
• Selenium provides a domain specific language
i.e, tests can be written in any language like
java, c#...
• Selenium can be deployed on any platform.

4. Components
1)Selenium IDE is a complete integrated development
environment (IDE) for Selenium tests.
• It is implemented as a Firefox extension
• It allows recording, editing, and debugging tests.
2)Selenium RC: RC makes it possible to write
automated tests for a web application in any
programming language.
3)Junit: it is a unit testing framework for java where it
promotes “First testing then coding” using
annotations and assertions.
3)TestNG:It is testing framework which covers all
categories of testing requires JDK5 or higher.

5. 4)Selenium Web Driver: Selenium WebDriver was
developed to support dynamic web pages
where elements of a page keep changing.
5)Frameworks with real time applications:
Linear Automation Framework.
Function Driven ,Data driven, Module driven
Framework.

6. Why java for selenium
• Selenium is platform independent
• Java is also platform independent

7. Installing java and eclipse
->Go to selenium software's folder->java software’s folder>double click .Check in c drive->Java-> jre6, jre1.5.0_12
Jre=java run time environment(it has supporting files to run
java)
Jde=java development kit(it has code)
-> selenium software’s folder->eclipse->click on round purple
color eclipse icon or create short cut for it on desktop

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Features of java
Simple
Secure
Portable
Object oriented
Robust
Multithreaded
Architecture neutral
Interpreted
High performance
Distributed
dynamic

9. OOP Principles
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Data Abstraction
Encapsulation
Polymorphism
Inheritance

10. Data abstraction
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Abstraction involves extracting only relevant information .
In other words, Abstraction means “looking for what you want “ in an object or a
class
Ex: An Automobile salesperson is aware that different people have different
preferences.some people are interested in the speed of car, some in the engine,
some in style.although all of them want to buy a car, each of them is interested in
a specific attribute or feature.
Sales man knows all the details of a car, but he presents only the relevant
information to a potential customer.As a result, the sales man practices
abstraction and presents only relevant details to customer.

11. Encapsulation
• Encapsulation literally means “to enclose in or as if in a
capsule”.
• Encapsulation is defined as the process of enclosing one or
more items with in a physical or logical section.
• It involves preventing access to non essential details
• Ex:when u plug in the cord of the vaccum cleaner and turn on
the switch, the vaccum cleaner starts.we do not see the
complex process needed to actually convert electricity into
suction power.
• In other words,the exact working of the cleaner has been
encapsulated.
• Therefore encapsulation is also defined as information hiding
or data hiding because it involves hiding many of the
important details of an object from the user.

12. polymorphism
• It is the ability that helps in executing different
operations in response to the same message.
• We can implement polymorphism by creating
more than one function with in a function
within a class that have the same name.
• The difference in the functions lies in the
number and types of parameters passed to
each function.

13. Inheritance
• Deriving the properties from parent to child is
inheritance
• with parent reference ,we can access child
class methods
• With child reference, we cannot access parent
class methods

14. Concept of class and object
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Class is collection of properties and methods
Object is the instance of class
Ex of class =car
Properties=colour,power,speed,model,height
Methods=fwd(),bkd(),stop(),start()
Ex of object= honda car , toyota car…..

15. Program made up of
• Program made of
1.Keywords
2.Identifiers
3.Literals
Ex: Int EmpId =10310;
Int = keyword
EmpId =identifier
10310 =literal

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Strurture of java program
//documentation section
//package section
//import section
//class section
{
Variables
Methods
}
Comments // for single line comment
Multiline comment /*-------*/

17. Platform independence
• The output of java compiler is not executable
code. rather it is byte code.
• Byte code is highly optimized set of
instructions designed to be executed by java
run time system, which is called java virtual
machine.
• Translating a java program into byte code
helps makes it easier to run a program in a
wide variety of environments. Only the JVM
needs to be implemented for each platform.

18. Explanation of structure
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To tell about the program like when, who, what, why
Package is like a folder,folder contain any thing but package contains all
related classes
We use “ Package” keyword to specify it is package ex: Package pk.sub
In a class only one package is created; multiline packages cannot be
created
Package will be the first line in program.
By default “Java.lang “Package is imported
Import java.lang.*; all methods are available in program; but not included.
We can import many packages in one class
Class is a user defined method ;it is collection of variables and methods.
At least one class must be created in a program;program can contain
many classes
Program name can be any thing but extension must be .java
Program name need not be same as class name
.class file is created same as class name

19. note
1.Every java program should have class
definition block
class ClassName
{
body
}
2.While saving a java program the file name should
be same as class name
3.Inside class body we can develop any java script
Main method is mandatory to start the execution
4.Java file is compiled using a command javac

20. Note contd….
5.compiler generates .class file if there are no errors
6.by default .class file will be saved in same location where
java file is saved
7.every statement in java must be terminated by ;
8.The java class can be executed by using a cmd java
ClassName
9.When ever a class is executed java starts the execution
by running main method
10.Java executes all the statements sequentially of main
method
11.Java throws error if main method is not defined .

21. Datatypes in java
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Java support 8 different types of datatypes under 4 families:
Integer : 1.Byte 2.Short 3.Int 4.Long
Real: float ,Double
Char: char
Boolean: boolean
Length of datatypes
1byte – 8 bits =(-2^7 to (2^7-1)= -128 to +127
short -2bytes=16bits=(-2^15 to +(2^15-1))
Int -4 bytes = 32 bits=(-2^31 to (2^31-1))
Long -8 bytes=64 bits=(-2^63 to (2^63-1))
Float -4 bytes
Double - 8 bytes
Char – 2 bytes
Boolean -1 byte
Default values for datatypes:
Integer =0,char=space ,boolean = false,real=0.0

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String class
We can store String data in 3 ways
1.charArray
Char name[]={‘o’,’n’,’e’,’f’,’o’,’r’,’c’,’e’}
2.String class object
String name =“oneforce”;
or
String name= new String(“oneforce”);
name = name.concat(“jayanagar”);
3.String Buffer class
StringBuffer sb =new StringBuffer(“oneforce”);
Sb.append(“jayanagar”);

23. Conditional and concatenation
operator
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If(condition){ statment1;}
If-else
If (condition){stat1}else{stat2;}
If(condition){stat1}-else if(condition){stat2}
Switch statement allows a variable to be tested
for equality against a list of values.
switch(expression){
case value1 : //Statements
break;
default : //Statements }

24. Concatenation operator
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public class concatenation {
public static void main(String[] args)
{
int a=10;
int b=20;
String str1="Hello";
String str2="world";
System.out.println(str1+str2);
System.out.println(str1+str2+a+b);
System.out.println(a+b);
System.out.println("sum of two numbers :"+(a+b));
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}
}
//for numbers + symbol acts as arthemetic operator
//for non numerics +symbol acts as concatenation operator

25. loops
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Java’s iteration statements are
For
While
Do-while

26. Arrays
• Grouping the data objects of same type in a
contiguous block of memory.
• Array is an object created with new operator.
• Array index starts with zero.
• Array size cannot be resized.

27. Array Declaration and Instantiation
-> Array Declaration:
<Data type> [ ]<array name >
Ex: int[] myArray;
-> Constructing an Array:
<array name > = new<data type> <array Size >
myArray=new int[5];

28. Initialization of Array
-> Primitive Array:
Int[] myArray={1,2,3,4,5}
-> Explicit initialization:
MyArray[0]=10;
MyArray[1]=20;
Two dimensional Array:
int sample[][] = new int[3][3];

29. Drawbacks of Array
• Large arrays take up space.
• Arrays can hold only one data type at a
time.
• Searching and sorting arrays is difficult.
• Inserting and removing data from arrays
is clumsy.

30. Local Variables
Local variable are variables defined inside
methods, constructors or blocks.
The variable will be declared and initialized
within the method and the variable will be
destroyed when the method has completed.

31. Global variable
• Global variables are declared in a class, but outside
a method, constructor or any block.
• Global variables can be accessed any where in the
class ,methods defined in the class.

32. Static and Non Static Variables
-> Static variables are declared with
the static keyword in a class, but outside a method,
constructor or a block.
->A single copy will be maintained irrespective of
number of objects.
• Static variables can be accessed by calling:
• With classname
• Without object
-> NonStatic variables are can be accessed by object.
-> It can have multiple copies as much as object
creation for class

33. EX
public class Test {
static int a= 6 ;
int b= 8;
public static void main(String[] args) {
Test obj1=new Test();
Test obj2=new Test();
obj1.a=10;
obj2.a=12;
obj1.b=24;
obj2.b=3 6 ;
System.out.println("Static a“ + obj1.a); //12
System.out.println("Static a“ + obj2.a); //12
System.out.println("Static a“ +a); //12
System.out.println("Static b “ + obj1.b); //24
System.out.println("Static b “ +obj2.b); //36
}
}

34. Static variable Example
public class Statvariable {
private static int salary;
public static void main(String args[]){
//classname.salary
salary = 1000;
System.out.println("salary: is “ +salary);
}
}

35. Static and Non Static Functions
-> Static Functions belongs to the class and can
be accessed by the main method directly and
also by the object creation or by class name.
-> A static method can access only static
members
-> Non Static Functions belongs to the object of
Class and can only be accessed by object .

36. Static Function
public class A {
static int add(int i,int j) {
return( I + j);
}
}
public class B extends A {
public static void main(String args[]) {
int s= 9;
System.out.println(add(s, 6 ));
}
}

37. Non Static Function
ppublic class A {
int add(int i,int j) {
return( I + j);
}
}
public class B extends A {
public static void main(String args[]) {
B b =new B();
int s= 9 ;
System.out.println(b.add(s, 6 ));
}
}

38. Static/NonStatic members works
when ever a java program is executed .....the
following steps happen
i)memory is allotted for execution
ii)and this memory is divided into heap and
stack
iii)java enter into stack and calls class loader
iv)the class loader loads static members of
class into heap memory.

39. v)all static members of class reside in an area called static pool
vi)java calls main methods for execution
vii)main method enters into stack on top of java
viii)when ever a object creation statement encounters , object will get
created into heap.
ix)on that time, the non static members of the class will be loaded into
object.
x)we can create multiple objects of a class .for each object creation a
copy of non static members will be loaded.
xi)after the completion of main method , the JVM calls garbage collection
to clean the heap.
xii)After that java releases the memory back to main memory
xiii)local variables are created in the stack and the life of the variable is
as long as the method is in the stack.
java gives preferences to local variables.
xiv)if any object does not have a reference then such object are known
as abundant object.

40. Object and Object References
• Object is the instance of class.
• Object Reference is the information on how to find
the object.
• A Single object can have more than 1 object
references.
EX : 2 objects[java,C+ +)] 2 reference
objects(Str1,Srtr2).
String Str1=new String(“Java”);
String Str2=new String(“C+ + “);
EX : 1 object with 2 object references
String Str1=new String(“Java”);
String Str2=Str1;

41. Call By Value
• Passing a value held in the variable as an
argument to the method.
• The value is copied to method parameters and
changes takes place to that parameters.
• That is why changes made to the variable
within the method had no effect on the
variable that was passed.

42. Call By Reference
• The Object is passed as an argument to the
method.
• No copy of object is made here.
• Changes made in the method will be reflected
in the original object

43. constructors
• It can be tedious to initialize all of the variables in a class each
time an instance is created.
• it would be simpler and more concise to have all of the setup
done at the time the object is first created.
• Java allows objects to initialize themselves when they are
created. This automatic initialization is performed through
the use of a constructor.
• Constructor is a special block in java class invoked at the time
of object creation
• Constructor should always be public
• A constructor name is same as class name ,the constructor
should not have return type and return statement
• Whenever we create an object , the constructor body will get
executed.

44. Difference between constructor and
method
Method
• Method can be executed
when we explicitly call it.
• Method name will not have
same name as class name
• Method should have return
type
• A method can be executed
n number of times on a
object
constructor
• Constructor gets executed
only when object is created
• Constructor name will be
same as class name
• Constructor should not
have return type
• Constructor will get
executed only once per
object

45. Super keyword
• Using super keyword
• We can call immediate super class instance
variable.

46. this
1.this keyword can be used to refer current class instance
variable.
2.this() can be used to invoke current class constructor
3.this keyword can be used to invoke current class method
(implicitly).
4.this can be passed as an argument in the method call
5.this can be passed as argument in the constructor call
6.this keyword can also be used to return the class instance.
7.We cannot use this and super at a time

47. final
• Final is the keyword to avoid inheritance
• We use final in three ways
1.Before a variable(you can’t change)
2.Before a method (you can’t over ride)
3.Before a class(you can’t inherit)

48. Inheritance
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Deriving members of one class to another class is known as inheritance.
The class from where member s are inherited are known a super class or
base class
The class to which members are inherited are known as subclass or
derived class
The general syntax to write inheritance class
Class SubClassName extends SuperClassName
Using extends keyword a class can inherit from super class
Always inheritance happens from super class to subclass.
Static members of the super class will not be inherited to subclass
because the static members will not be loaded into object memory
Whenever an object of subclass is created both super class member and
sub class member will be loaded into object
Inheritance happens through constructor chain.

49. Inheritance contd…
• Whenever an object of sub class is created
,the subclass constructor calls super class
constructor ,the super class constructor calls
its super class constructor . this is known as
constructor chain.

50. Types of inheritance
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There are 3 types of inheritance
Single
Circular(no prg supports )
Multiple (java does not support)
a
A
B
b
B
A
c
C

51. Interface
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Java supports 3 different structures
1. Fully implemented
2. Fully unimplemented
3. Partly implemented/unimplemented
• Interface contains abstract methods(with no body)
• Interface is an fully unimplemented structure
• We need to provide body for all methods in interface
• In interface, we cannot create the object of interface
• Can contain constants, but not variables
• All methods, variables are public static final

52. Interface
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It is a class with no implemented methods
Interface must not be static
It contains only declarations
Methods in interface must be static
All variables must be assigned a value
Interface variables are static ;we cannot change values
Interface methods are neither static nor non static
Creating interface reference ,we can access implemented
class methods which are defined in interface class but not
methods defined in implemented class.

53. Abstract class
• It is partly unimplemented or partly
implemented class which contains zero or
more abstract methods
• Concrete method is the method with body
• Abstract method is the method with out body
• If user want to inherit the abstract class;he
need to extend but not implement

54. Difference between interface and
abstract class
interface
• Fully unimplemented
structure that contains all
abstract metods
• Interface contains only
constants
• The object of interface can’t
be created directly
,anomous class is recquired
to create object for this
class
• Uses “implements “
Abstract class
• Partly implemented or
unimplemented structure
• Can contain variables
• Can contain constructors
• Abstract class object get
created automatically when
sub class object got created
• Uses “extends”

55. Overloading and over riding methods
• Redefining method of parent class with the
same name in child class is method over riding
• Redefining same method with different
parameters is called method overloading
• Note:
1.Reference type determines which overloaded
method is used at compile time.
2.Object type determines which over riden
method is used at runtime.

56. Over loading
• Overloading is about creating multiple methods with the
same name, but different signatures, in the same scope.
• overloading can take place in the same class or in the
subclass.
• overloaded methods MUST have a different argument
list.
• overloaded methods MAY change the return type (in
case argument list is different).
• overloaded methods MAY change the access modifier.
• reference type determines which overloaded method
will be used at compile time.
• constructors MAY be overloaded .

57. Over Riding
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Overriding is about changing the behavior of a certain method in
the child class from the way it is behaving in the parent class.
Applies ONLY to inherited methods
is related to polymorphism
object type (NOT reference variable type) determines which over
riden method will be used at runtime
overriding method MUST have the same argument list (if not, it
might be a case of overloading)
Abstract methods MUST be overridden
Final methods CANNOT be overridden
Static methods CANNOT be overridden
Constructors CANNOT be overridden

58. Packages
• Java Package is a mechanism for organizing Java
classes in to a namespace.
• Classes present in the package can access the
each others class members.
• We are going to import classes from the package.
• Package name usually starts with lower case.
• Classes within a package can access classes and
members declared with default access and class
members declared with the protected.

59. Access Control Modifiers
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Java provides a number of access modifiers to
set access levels for classes, variables,
methods and constructors. The four access
levels are:
Default:-Visible to the package. No modifiers
are needed.
Private:-Visible to the class only .
Public:-Visible to the world.
Protected:-Visible to the package and all
subclasses.

60. Non Access Modifiers
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Java provides a number of non-access modifiers
to achieve many other functionality.
The static modifier for creating class methods
and variables
The final modifier for finalizing the
implementations of classes, methods, and
variables.
The abstract modifier for creating abstract
classes and methods.
The synchronized and volatile modifiers, which
are used for threads.

61. Exception Handling
->Exception is an Event which halts normal execution
abruptly and alternatively the program will be
terminated.
• Exception occurs when our code asks JVM to do
technically impossible tasks.
• Ex:Divide by Zero.
• All Exception classes are subclasses of Throwable.
• Throwable has two subclass :Exception and Error

62. contd
Types of Exception
1)Checked Exception: A checked exception is an exception
that is typically a user error or a problem that cannot
be foreseen by the programmer.
EX: If a file is to be opened, but the file cannot be found, an
exception occurs
2)A runtime exception is an exception that occurs that
probably could have been avoided by the programmer.
EX:ArrayIndexOutOfBoundException
3)Error describes internal error and resource exhaustion.
Mostly beyond the programmers control.

63. Exception Handling
1. Anticipate the error by the user/system.
2. Return the program to a safe state that enables the
user to execute other commands.
3. Inform the user of the error’s cause.
4. Allow the user to save work and terminate the
program gracefully.
63

64. Keywords of Exception
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Try
Catch
Throw
Throws
finally

65. Try-Catch block
• In this mechanism Try block will contain the
code which may throw the exception.
• Catch block will declare the type of exception
occurred.
• EX:try{
}
catch(Exception E){
}

66. Throws-Throws
• If a method does not handle a checked exception,
throws keyword should be used at the end of a
method's signature.
• To explicitly throw the exception of a newly
instantiated one or an exception that you just
caught, we use Throw keyword.
• EX: public void deposit(double amount) throws
RemoteException { // Method implementation throw
new RemoteException(); } //Remainder of class
definition }

67. Finally
• The finally keyword is used to create a block
of code that follows a try block. A finally block
of code always executes, whether or not an
exception has occurred.
• A finally block appears at the end of the catch
blocks .

68. Collections
• Collection is a set containing the classes and
interfaces which implements reusable data
structures like List,Array,HashTable.
• There are so many interfaces available like
java.util.ArrayList;
java.util.Iterator;
java.util.List;
java.util.ListIterator;

69. Array List
1)We are Creating the ArrayList as
ArrayList<String> list = newArrayList<String>();
2)To add elements to the list is
list.add("A");
List.add(2,”S”);//index=2
3)To get the element from list
list.get(index).

70. stack
• Stack is a subclass of Vector that implements a
standard last-in, first-out stack.
• boolean empty()
• Object peek( )
• Object pop( )
• Object push(Object element)
• int search(Object element)

71. HashTable
• The java.util.Hashtable class implements a
hashtable, which maps keys to values.
• Hash function will compute unique value as a
index to the key.
• Methods are:
• Set<Map.Entry<K,V>> entrySet()
• Collection<String> collection =ht.values();
• Set<String> set1 =ht.keySet()

72. Linked HashSet
• Linked HashSet maintains a list of the entries
in the set, in the order in which they were
inserted. This allows insertion-order iteration
over the set.
• The values will be retrieved in same order of
insertion using iterator.

73. Reflection API