/*

* To identify which class is interface and which class is normal class we have to follow a rule-

* Rule-> use "I" as prefix in the class name

* example- Demo(normal class) ----> IDemo(interface)

* Student(normal class)---> IStudent(interface)

* that is a convention that developer follows

*

*

* In springBoot developer follows this convention so we have to learn it and follow same as it.

*

**To inherit an interface class we have to use "implements" keyword

*

**Also to the class which will extend the interface that also have to follow a name convention rule that is:

* ---> we have to use "Impl" as suffix in the class name.

* eg:- suppose I have to implement a interface class name ISample then my class name will be

*

* class "SampleImpl" implements ISample

* {

*

* }

*

*/

interface ISample

{

//100% abstraction

//services

/*public abstract*/ void m1();

/*public abstract*/ void m2();

}

class SampleImpl implements ISample

{

public void m1() //in interface class the access modifier is by default "public" and in normal class it is "default"

{ //visibility is decreasing hence we have to explicitly make it "public"

System.out.println("m1() is calling...");

}

public void m2()

{

System.out.println("m2() is calling...");

}

}

public class SecondCode {

public static void main(String[] args) {

ISample s=new SampleImpl(); //loose coupling

s.m1();

s.m2();

}

}