Java OOPS Interfaces,Collection,Selenium WebDriver

In this Video we will discuss in detailed information about interfaces.
What is a JAVA Interface?
How to use the Interfaces?
What are the interface methods and variables?

Java Interface:
==============

An interface is a reference type in java.
It is similar to class , but it is a collection of abstract methods.
The class uses the interface by using the keyword implements.
Interface should not contain non-static methods
Methods : public abstract
variables: public static final
A class can implement multiple interfaces.
A class cannot extend more then one class.

public class HelloWorld implements Collection
{

public abstract void add()
{

}

public void addAll()
{

}


}

public interface Collection
{

public abstract void add();

public void addAll();

public static abstract void delete();

public void deleteAll()//not valid
{


}

}

Collection Interface :

5 methods


List Interface :
4 methods



public interface Collection{

5 abstract

}

public interface List extends Collection{

4 abstract

}

public class ArrayList implements List
{

5+4 = 9 methods provide implementation

}

Selenium WebDriver:
-------------------------

WebDriver driver = new ChromeDriver();

ChromeDriver is a class implementing the Interface WebDriver

public interface SearchContext{

}
public interface WebDriver extends SearchContext{


}
public class RemoteWebDriver implements WebDriver{


}
public class ChromeDriver extends RemoteWebDriver
{


}

WebDriver driver = new RemoteWebDriver();

WebDriver driver = new ChromeDriver();d