interface

1/* File name : MammalInt.java */
2public class MammalInt implements Animal {
3
4   public void eat() {
5      System.out.println("Mammal eats");
6   }
7
8   public void travel() {
9      System.out.println("Mammal travels");
10   } 
11
12   public int noOfLegs() {
13      return 0;
14   }
15
16   public static void main(String args[]) {
17      MammalInt m = new MammalInt();
18      m.eat();
19      m.travel();
20   }
21} 

1Interfaces specify what a class must do. 
2It is the blueprint of the class.
3It is used to achieve total abstraction. 
4We are using implements keyword for interface.
5
6Basic statement we all know in Selenium is
7WebDriver driver = new FirefoxDriver();
8WebDriver itself is an Interface.
9So we are initializing Firefox browser
10using Selenium WebDriver.
11It means we are creating a reference variable
12of the interface and creating an Object.
13So WebDriver is an Interface and
14FirefoxDriver is a class.
15
16
17

1public interface Exampleinterface {
2	
3  public void menthod1();
4  
5  public int method2();
6
7}
8
9class ExampleInterfaceImpl implements ExampleInterface {
10
11
12  	public void method1()
13    {
14        //code here
15    }
16  
17    public int method2()
18  	{
19    	//code here
20  	}
21
22}

1Interfaces specify what a class must do. 
2It is the blueprint of the class.
3It is used to achieve total abstraction. 
4We are using implements keyword for interface.
5
6Basic statement we all know in Selenium is
7WebDriver driver = new FirefoxDriver();
8WebDriver itself is an Interface.
9So we are initializing Firefox browser
10using Selenium WebDriver.
11It means we are creating a reference variable
12of the interface and creating an Object.
13So WebDriver is an Interface and
14FirefoxDriver is a class.
15

1Interface blueprint of class.
2■ The main purpose of an interface is providing 
3additional information and behaviors to any class that needs it 
4■ The other way to achieve abstraction in java is via interface    
5■ An interface is not a class, but acts similar, 
6can be super type to a class
7■ To create an interface:the keyword interface is used instead of class
8■ Inheritance allows only one parent class,
9but it is possible to implement multiple interfaces to a class 
10■ It’s possible to extend interfaces to other interfaces.
11■ there is only one access modifier allowed in interface ==> public
12*Interface can have: variable:(static & final by default),
13methods: (abstract methods, static methods, default method)
14*Interface cannot have: constructor, instance variable
15instance methods, blocks
16
17extends vs implements: both are used for inheriting         
18extends: class extends class, interface extends interface 
19(A class can inherit from one class only (extends)
20implements: class implements interface1, Interface2 … 
21(A class can inherit multiple interfaces (implements)
22**RemoteWebDriver  implements WebDriver,
23           /       |       \  
24  chrome   firefox   opera     
25 WebDriver driver = new ChromeDriver(); =>Interface
26TakeScreenShot,JavaScriptExecuter=>Interface
27List and Set also interface. You cannot create object in interface

1Interfaces specify what a class must do. 
2It is the blueprint of the class.
3It is used to achieve total abstraction. 
4We are using implements keyword for interface.
5
6Basic statement we all know in Selenium is
7WebDriver driver = new FirefoxDriver();
8WebDriver itself is an Interface.
9So we are initializing Firefox browser
10using Selenium WebDriver.
11It means we are creating a reference variable
12of the interface and creating an Object.
13So WebDriver is an Interface and
14FirefoxDriver is a class.
15List and Set also interface. 
16You cannot create object in interface