3. Suppose that you have written a time server, which periodically notifies its clients of the current date and time. Write an interface that the server could use to enforce a particular protocol on its clients. 4. Abstract classes and interfaces can both be used to specify common behavior of objects. How do you decide whether to use an interface or an abstract class? Explain your answer.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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3. Suppose that you have written a time server, which periodically notifies its clients of the
current date and time. Write an interface that the server could use to enforce a particular
protocol on its clients.
4. Abstract classes and interfaces can both be used to specify common behavior of objects.
How do you decide whether to use an interface or an abstract class? Explain your
answer.
Transcribed Image Text:3. Suppose that you have written a time server, which periodically notifies its clients of the current date and time. Write an interface that the server could use to enforce a particular protocol on its clients. 4. Abstract classes and interfaces can both be used to specify common behavior of objects. How do you decide whether to use an interface or an abstract class? Explain your answer.
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