Answered: (a) Write the Java code for the…

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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Question

(a) Write the Java code for the convertJPG() method in the Facade class. You
may assume that all other methods in all the classes have been fully implemented.
For example, in the Facade class, the constructor Facade() will create the
variable state and make it point to the image that needs to be converted. You may
further assume that the convert() method in the JPG class will convert the image
pointed to by state to JPG format.

(b) Write the Java code for the main() method in the FacadeDemo class. You may
assume that all the other classes are fully implemented. In the main() method, first
create an object instance of the Facade class, and then convert the image pointed to
by state to JPG.

Consider an image conversion application where there are a large number of third party
functions to convert an image to different formats such as JPG, GIF, PNG, etc. This can be
simplified using the Façade design pattern. The class diagram is shown in Fig. Q3.
Facade Demo
+main(): void
asks
creates
Facade
-state Format
-jpg: Format
-gif: format
-png: Format
+Facade(): void
+convertJPG(): void
+convertGIF(): void
+convertPNG():void
JPG
implements
+convert() : void
<<interface>>
Format
+convert() : void
GIF
+convert(): void
PNG
+convert(): void

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