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You are asked to write a Java program to calculate the commercial value of the stamps owned by a philatelist. Each philatelist has a name and a collection of stamps. The stamps can be divided into two groups: Group I and Group II. Each stamp has the following attributes: name, face value, and publication year. The commercial value of a stamp is calculated as follows:1. for a stamp in Group I, the commercial value is twice its face value,2. for a stamp in Group II, the commercial value is triple its face value.You need to follow the following interfaces:public interface IStamp { double get_faceValue();String get_name(); // return the name of a stamp Int get_publicationYear(); //return the Publication year of a stamp}public interface IPhilatelist { ArrayList get_allStamps(); void add_stamps(IStamp stmp);double get_totalCommercialValue(); } Your classes (Stamp_GroupI, Stamp_GroupII and Philatelist) implementing the above two interfaces, as appropriate, should NOT have any other public method.The test file is as follows:class Program { static void Main(string[] args) { IPhilatelist john = new Philatelist("John"); IStamp w1= new Stamp_GroupII("Yellow Stone",0.29, 1975); IStamp w2 = new Stamp_GroupI("Forever Freedom",0.45, 2011); IStamp w3 = new Stamp_GroupI("Forever BigBen",0.42, 2008); john.add_stamps(w1); john.add_stamps(w2); john.add_stamps(w3); System.out.println("Total Commercial value is" + john.get_totalCommercialValue()); } }
describe data abstraction
using polymorphism to write a program to display digital clock
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How can we define a Pixel? It is the smallest number of element of image that is spread along with regular array on display and each constituent consist of particular color.
We can get the values in the action classes by using data.getParameter("variable name described in the velocity page");
Message is a light weight message having only header and properties and no payload. Therefore if the If the receivers are to be notified about an event, and no data requires to be
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Prototype is having multiple instances or having clone.
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