Suppose you have some rupees in your hands. You can buy from this money something from that shop where billing is done in rupees. Suppose you go to such a shop for buying where only dollars are accepted, you cannot use your rupees there. This money is like a class. A class can fulfill only a particular requirement. It is not useful to handle different situations. Now suppose you have a credit card. In a shop, you can easily pay in rupees by using your credit card. If you go to another shop where dollars are accepted, you can also pay in dollars. The same credit card can be used to pay in pounds also. But how is this credit card paying in different currencies? Let’s understand it. Basically, a credit card is like an interface that performs several tasks. It is a thin plastic card that contains identification information such as your name, bank name, and perhaps some numbers. It does not hold any money physically. But here question is that how are shop keepers able to draw money from credit card? Behind credit card, have our bank account details from where the money is transferred to shop keepers after authentication. This bank account can be considered as an implementation class that actually performs different tasks. Write in Java and comments

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Suppose you have some rupees in your hands. You can buy from this money something from that shop where billing is done in rupees. Suppose you go to such a shop for buying where only dollars are accepted, you cannot use your rupees there. This money is like a class. A class can fulfill only a particular requirement. It is not useful to handle different situations. Now suppose you have a credit card. In a shop, you can easily pay in rupees by using your credit card. If you go to another shop where dollars are accepted, you can also pay in dollars. The same credit card can be used to pay in pounds also. But how is this credit card paying in different currencies? Let’s understand it. Basically, a credit card is like an interface that performs several tasks. It is a thin plastic card that contains identification information such as your name, bank name, and perhaps some numbers. It does not hold any money physically. But here question is that how are shop keepers able to draw money from credit card? Behind credit card, have our bank account details from where the money is transferred to shop keepers after authentication. This bank account can be considered as an implementation class that actually performs different tasks. Write in Java and comments

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