(The Fan class) Design a class named Fan to represent a fan. The class contains: Three constants named SLOW, MEDIUM, and FAST with the yalues 1, 2, and 3 to denote the fan speed. The Fan class VideoNote M08_LIAN6521_09_SE_C08.qxd 2/2/12 10:21 PM Page 331 332 Chapter 8 Objects and Classes A private int data field named speed that specifies the speed of the fan (the default is SLOW) A private boolean data field named on that specifies whether the fan is on (the default is false) A private double data field named radius that specifies the radius of the fan (the default is 5) A string data field named color that specifies the color of the fan (the default is blue) The accessor and mutator methods for all four data fields A no-arg constructor that creates a default fan A method named toString) that returns a string description for the fan. If the fan is on, the method returns the fan speed, color, and radius in one combined string. If the fan is not on, the method returns the fan color and radius along with the string "fan is off" in one combined string Draw the UML diagram for the class and then implement the class. Write a test program that creates two Fan objects. Assign maximum speed, radius 10, color yellow, and turn it on to the first object. Assign medium speed, radius 5, color blue, and turn it off to the second object. Display the objects by invoking their toString method SAMPLE RUN #01 Java Fan Standard Output Hide Invisibles A-10 .0 . Inch-yellow. fan-at-a-speed-of-3qd A.5.0.inch.blue fan: fan is off+

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

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(The Fan class)

Design a class named Fan to represent a fan. The class contains:
■ Three constants named SLOW, MEDIUM, and FAST with the values 1, 2, and 3 to
denote the fan speed. The Fan class
VideoNote
M08_LIAN6521_09_SE_C08.qxd 2/2/12 10:21 PM Page 331
332 Chapter 8 Objects and Classes
■ A private int data field named speed that specifies the speed of the fan (the
default is SLOW).
■ A private boolean data field named on that specifies whether the fan is on (the
default is false).
■ A private double data field named radius that specifies the radius of the fan
(the default is 5).
■ A string data field named color that specifies the color of the fan (the default
is blue).
■ The accessor and mutator methods for all four data fields.
■ A no-arg constructor that creates a default fan.
■ A method named toString() that returns a string description for the fan. If
the fan is on, the method returns the fan speed, color, and radius in one combined
string. If the fan is not on, the method returns the fan color and radius
along with the string “fan is off” in one combined string.
Draw the UML diagram for the class and then implement the class. Write a test
program that creates two Fan objects. Assign maximum speed, radius 10, color
yellow, and turn it on to the first object. Assign medium speed, radius 5, color
blue, and turn it off to the second object. Display the objects by invoking their
toString method.

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