Selenium : Selenium WebDriver And Interface

 WebDriver And Interface

Q. What Is An Interface And Why To Use It?

Interface is set of rules for behavior of application. Interface looks like class but it is not. When you implements that Interface In any class then all those Interface rules must be applied on that class.

 In short, if you implement an Interface on class then you must have to override all the methods of Interface In your class. Interface will create Rules to follow structure for class where it Is Implemented. This way, if you look at the code of Interface, You can get Idea about your program business logic. When you are designing big architecture applications like selenium web driver, you can use Interface to define business logic at Initial level.

 Interface can be implemented with any class using implements keyword. There are set of rules to be followed for creating an Interface. Let me tell you all these rules first and then give you an example of an Interface.

1.       Interface can not hold constructor.

2.       Interface can not hold instance fields/variables.

3.       Interface can not hold static methods.

4.       You can not instantiate/create object of an Interface.

5.       Variables Inside Interface must be static and mandatory to initialize the variable.

6.       Any class can Implement Interface but can not extend Interface.

7.       Can write body less methods Inside Interface.

8.       By default all the methods and variables of Interface are public so no need to provide access modifiers.

public interface College {        //Interface file

     static String Collegename = "XYZ";  //static by default

     void StudentDetails();    //Created non static methods without body.

     void StudentResult();

}

public class Computer implements College {

                                        //@Override annotation describes that methods are overridden on interface method.

                                         //Methods name, return type are same as methods of an Interface.

     @Override

     public void StudentDetails() {  System.out.println("hi"); }

     @Override

     public void StudentResult() { System.out.println("bye");  }

}

public class TestCollege

{                  //Class file. No need to implement Interface.

                    public static void main(String[] args)

{

                                         //Can access Interface variable directly using Interface name.

                                        System.out.println(College.Collegename+" Collage student details.");

 

                                                            //Created Computer class object with reference of interface College.

                                        College compdept = new Computer();

                                                            //Methods will be called from Computer class.

                                        compdept.StudentDetails();

                                        compdept.StudentResult();

 }

}

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Selenium WebDriver And Interface

Simple example of Interface In selenium WebDriver Is WebDriver Interface. When you are Initializing any browser using selenium WebDriver, You are writing statements like bellow.

WebDriver driver = new FirefoxDriver();

Or

WebDriver driver = new ChromeDriver();

You can view more examples of selenium WebDriver on THIS PAGE.Here, WebDriver Is Interface and FirefoxDriver and ChromeDriver are the class files where WebDriver Interface Is Implemented.

http://software-testing-tutorials-automation.blogspot.in/2014/04/interface-in-java-tutorials-for.html