I am doing the following question, I already did part A.

which is publicclassdigicelMain{publicstaticvoidmain(String[]args)throwsException{}}

publicclasscustomer{privateStringname;privateStringtelephone;customer(){this.name="";this.telephone="";}customer(Stringname,Stringtelephone){this.name=name;this.telephone=telephone;}voidputCustomer(Stringname,Stringtelephone){this.name=name;this.telephone=telephone;}}

I need help with point B

B. You are required to create two sub classes called prePaid and postPaid, override the super class member function to accept customer name and telephone number along with monthly post-paid charges for post-paid customers and monthly prepaid purchases for prepaid customers. f