Designing Classes
Describe the public methods, instance variables, private methods, static methods, static variables, and/or constructors that you would use to implement the following classes.
a. A Cell Phone
• The phone is either on or off, and in-use or not in-use.
• The phone has its own phone number as well as a list of n frequently called numbers.
• The phone can display its own number as well as the list of frequently called numbers.
• You can “speed-dial” a frequently called number by providing an integer in the range 1 through n that indexes a stored phone number.
• You can determine whether or not the phone is ringing, and if so, answer the phone.
• If you make a call or answer a call, the phone is in-use.
• You can make a call only if the phone is not in-use.
• You can hang up the phone, and then it is not in-use.
• You can turn the phone on or off. If you turn it off you also hang up.
• Your phone remembers all numbers that you dial and stores them.
• You can view the list of numbers you have dialed.
• You can redial the most recently called number.
b. A Computer Speaker
• A speaker has a green LED that is either on or off.
• A speaker has a power switch that toggles the power.
• A speaker has a volume switch with 10 settings, 0–9 inclusive.
• A speaker has a color (black, gray, white).
• A speaker has a power rating (high, medium, and low).
• You can bump the volume up or down. Bumping up from 9 or down from 0 has no effect.
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