Write a class named Cellphone. The class should contain: Three constants named SHORT, MEDIUM, and LONG with the values 10, 20, and 30 to denote the call duration. private data field: call_duration(double). • A public static field numberOfCalls(int) which should count the number of calls made. • A default constructor with no argument. A constructor that creates Cellphone object with the specified data field. • Get and set methods for the data field. • A method named makeCall() that will make a call. • A method named endCall() that will end a call.

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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Task – 1
Write a class named Cellphone. The class should contain:
Three constants named SHORT, MEDIUM, and LONG with the values 10, 20, and 30 to
denote the call duration.
private data field: call_duration(double).
• A public static field numberOfCalls(int) which should count the number of calls made.
• A default constructor with no argument.
• A constructor that creates Cellphone object with the specified data field.
• Get and set methods for the data field.
• A method named makeCall() that will make a call.
A method named endCall() that will end a call.
• A method called getCallDuration() that measures the duration of a call.
a. Draw the UML diagram of Cellphone.
b. Write the class Cellphone in Java.
c. Write a test program that will create an array of x number of Cellphone objects and create
each of them by taking the call_duration from the user where, x = the 5th digit of your NSU ID.
For example, if your ID is 1238765999, then x = 7. If the digit is 0 for your NSU ID, then use the
next digit. Later on, it should output the average call_duration from the array.
Transcribed Image Text:Task – 1 Write a class named Cellphone. The class should contain: Three constants named SHORT, MEDIUM, and LONG with the values 10, 20, and 30 to denote the call duration. private data field: call_duration(double). • A public static field numberOfCalls(int) which should count the number of calls made. • A default constructor with no argument. • A constructor that creates Cellphone object with the specified data field. • Get and set methods for the data field. • A method named makeCall() that will make a call. A method named endCall() that will end a call. • A method called getCallDuration() that measures the duration of a call. a. Draw the UML diagram of Cellphone. b. Write the class Cellphone in Java. c. Write a test program that will create an array of x number of Cellphone objects and create each of them by taking the call_duration from the user where, x = the 5th digit of your NSU ID. For example, if your ID is 1238765999, then x = 7. If the digit is 0 for your NSU ID, then use the next digit. Later on, it should output the average call_duration from the array.
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