Answered: How does using an interface and dynamic…

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

Section: Chapter Questions

Problem 1PE

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(JAVA) How does using an interface and dynamic dispatching make our coding more efficient?

Group of answer choices:

a)It means we do not have to declare the variable’s type, and instead the system will use duck typing. This will save us from typing lines of code that are just variable declarations.

b)All options are correct.

c)We can call a method, but not specify which specific type the object using the method is, instead specifying the name of the interface. Java will properly call the appropriate object’s method. This allows us to have a loop that will end up with a variable that takes on different types but all implement the same interface. This allows different objects to properly call their own method in the same line of code.

d)It means that when we call a method a dispatcher will wait for the proper time to schedule the execution of that method.

It’s actually inefficient because we need to re-implement the function of the same name many more times. For this reason it should be avoided.

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