*need question D only*, got 2 attached picture, one is the question it self and another one is my and to refer so that could do the last question d +(a)(b)(c)(d)package com.mycompanypublic interface Product Register Listner {public void register(String s);}package com.mycompanypublic abstract class Software implements Product Register Listner!String name;double version;Software(String name,double version }{super();}this.name=name;this version=version;abstract void about();}package com.mycompanypublic final class LincedSoftware extends Software {private double price;Linced Software(String name,double version double price){super(name version);this.price=price;}void about() {System.out.println("The Software "+name+ " registration detail has sent out ");}public void register(String s) {System.out.print("your user "+s+" account ");}public static void main(String args[]){LincedSoftware l-new LincedSoftware("window", 7.1,5000);I.about();I.register("User@xxx.com");} Question 4(a) Define an interface called Product RegisterListener. This interface shouldinclude a void type function called register that accepts a String parameter.(b)(c)(d)Create an abstract class called Software. Include a String attribute called name and adouble attribute called version. Ensure it can be accessed within the class hierarchy.Include a constructor to initialize all the attributes. Create an abstract method namedabout.Create a child class called Licensed Software that inherits from the Software andProduct RegistertListener. The class should include a private member calledprice as double type. Ensure that this class cannot be sub-classed. Include a constructorto initialize the data members appropriately. Override the about method to print out allthe software details. Override the register method to pass the email address as theparameter and it will print out the following sample output:The software "name" registration details have been sent outto your user@xxx.com account.Briefly explain the Polymorphism in object-oriented programming. Use the example ofSoftware, LicensedSoftware and Freeware (assume another new child class)which created in part (b) and (c), and write a code ragment to demonstrate the conceptof Polymorphism in software development.

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*need question D only*, got 2 attached picture, one is the question it self and another one is my and to refer so that could do the last question d +(a)(b)(c)(d)package com.mycompanypublic interface Product Register Listner {public void register(String s);}package com.mycompanypublic abstract class Software implements Product Register Listner!String name;double version;Software(String name,double version }{super();}this.name=name;this version=version;abstract void about();}package com.mycompanypublic final class LincedSoftware extends Software {private double price;Linced Software(String name,double version double price){super(name version);this.price=price;}void about() {System.out.println(&#34;The Software &#34;+name+ &#34; registration detail has sent out &#34;);}public void register(String s) {System.out.print(&#34;your user &#34;+s+&#34; account &#34;);}public static void main(String args[]){LincedSoftware l-new LincedSoftware(&#34;window&#34;, 7.1,5000);I.about();I.register(&#34;User@xxx.com&#34;);} Question 4(a) Define an interface called Product RegisterListener. This interface shouldinclude a void type function called register that accepts a String parameter.(b)(c)(d)Create an abstract class called Software. Include a String attribute called name and adouble attribute called version. Ensure it can be accessed within the class hierarchy.Include a constructor to initialize all the attributes. Create an abstract method namedabout.Create a child class called Licensed Software that inherits from the Software andProduct RegistertListener. The class should include a private member calledprice as double type. Ensure that this class cannot be sub-classed. Include a constructorto initialize the data members appropriately. Override the about method to print out allthe software details. Override the register method to pass the email address as theparameter and it will print out the following sample output:The software &#34;name&#34; registration details have been sent outto your user@xxx.com account.Briefly explain the Polymorphism in object-oriented programming. Use the example ofSoftware, LicensedSoftware and Freeware (assume another new child class)which created in part (b) and (c), and write a code ragment to demonstrate the conceptof Polymorphism in software development.

Accepted Answer

Polymorphism
Data that can be handled in several ways is said to be polymorphic. As poly means…

Briefly explain the Polymorphism in object-oriented programming. Use the example of Software, LicensedSoftware and Freeware (assume another new child class) which created in part (b) and (c), and write a code fragment to demonstrate the concept of Polymorphism in software development.