Question

(Java) Please describe how API's can be created using abstract classes, interfaces and regular classes.

Answer 1

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QUESTION :-

(Java) Please describe how API's can be created using abstract classes, interfaces and regular classes.

ANSWER :-

Regular Classes: Regular classes only have concrete methods. But regular classes cannot have abstract method. Understand and take only the concrete method and understand the upper abstract class.

For an example :-

example : public class Student{}

Interfaces: Interfaces have method declaration. And would not have method implementation. All the methods in interfaces are public abstract (default). A few class has to inherit the interface and state and describe the implementation of the method.

For an example : Interface Car { void PrintColor();

void PrintNumberOfGears();}

Public class BlackCar implements Car { public void PrintColor()

{System.out.println("Color is Black");}

public void PrintNumberOfGears()

{System.out.println("Number of Gears are 5");} }

Abstract Class: Abstract Methods are related or much similar to normal classes. And it can have abstract over and above concrete methods. Abstract methods must be inherited and defined.

example : public abstract class Students { public void PrintMarks()

{System.out.println("Printing Marks");} //concrete method

public abstract void PrintEmpId { } //abstract method

} //please note the abstract keyword

Important note : APIs are also methods. Therefore all of the over and above explaining descriptions are great and useful for creating APIs.

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