(2a) Model a physical entity as a Java Class (70 points) – focus on Encapsulatio

Question

(2a) Model a physical entity as a Java Class (70 points) – focus on Encapsulation:

This is an Object Modeling/Programming exercise – albeit around 1 (maybe 2) Object(s). Using the Radio Class implementation provided as a point of reference, think of a common (or maybe, not so common) physical device or appliance that’s worthy of modeling as an Object. Consider the following:

The basic operations/functionality of your device/appliance become public methods of the implementing Class (e.g., on, off, go, start, stop, … )

The internal structure (or how you envision the internal structure) of your device/appliance become the data members of the implementing Class. This would include the internal piece-parts of the device and well as “state components”. For example, modeling a bread toaster might require a “heat coil” as well as a “power on/off” indicator.

In the spirit of modularity, reusability, etc., private/protected methods can and should be used to implement sub-tasks performed by public methods.

In addition to Class members supporting (a) (b) (c) above, you also need to implement:

Either a public void main(String [] ){} method or a second “launch” Class whose only job will be to:

Create an instance of your modeled Class

Invoke a sequence of methods on that instance that demonstrates the functionality and basic usefulness of what you built.

A “String toString()” method – allowing you to display ‘the state’ of the Object Instance.  

What do we mean by the state of the Instance? The collective value of all data members ‘at a moment in time’ is considered the instance’s state. That’s a valid definition of state, but for this lab, customize the Class’ toString() method to display values of data members that are considered significant to the device/application’s operation.   

Note: Refer to the Radio Class’ toString() and main() methods as a guide. Also refer to the Radio’s execution output below – showing that a single instance has been created, and taken through a series of operations (method invocations). At critical points, a “toString()” representation of the instance’s state is displayed to the console using System.out.println()or the like.

Replace the output below with yours!

New Instance

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=false, selectedVolume=0, selectedStation=0.0, selectedBand=null,

amPresets=null,

fmPresets=null,

firstTimeOn=null, lastTimeOn=null, selectedBalance=0, selectedBassLevel=0, selectedTrebleLevel=0]

Turned On

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=770.0, selectedBand=AM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[99.0, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Changed Station

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=92.3, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[99.0, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Assign Preset [1] to + FM

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=101.1, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[101.1, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Turned Off

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=false, selectedVolume=5, selectedStation=101.1, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[101.1, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

**************************************************************************************************************************************

I am trying to build a printer and scanner so please can you design the code to be a printer and scanner. Thank you.

New Instance

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=false, selectedVolume=0, selectedStation=0.0, selectedBand=null,

amPresets=null,

fmPresets=null,

firstTimeOn=null, lastTimeOn=null, selectedBalance=0, selectedBassLevel=0, selectedTrebleLevel=0]

Turned On

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=770.0, selectedBand=AM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[99.0, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Changed Station

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=92.3, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[99.0, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Assign Preset [1] to + FM

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=true, selectedVolume=5, selectedStation=101.1, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[101.1, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Turned Off

Radio Instance: [SerialNumber=1411918066216:43514652, powerState=false, selectedVolume=5, selectedStation=101.1, selectedBand=FM,

amPresets=[563.0, 1080.0, 773.0, 730.0, 1192.0, 584.0, 608.0, 843.0],

fmPresets=[101.1, 92.0, 101.0, 99.0, 88.0, 103.0, 92.0, 92.0, 92.0, 105.0, 99.0, 93.0],

firstTimeOn=Sun Sep 28 11:27:46 EDT 2014, lastTimeOn=Sun Sep 28 11:27:46 EDT 2014, selectedBalance=0, selectedBassLevel=2, selectedTrebleLevel=3]

Explanation / Answer

import java.util.*; import edu.cuny.csi.csc330.lab1.*; import edu.cuny.csi.csc330.lib.Randomizer; // Radio Class definition public class Radio { static int tester = 9; /** * group Band radio band information into nested inner Classes * static data and methods specific to AM/FM banding */ public static class Bands { static int tester = Radio.tester; public static double [] generateInitialPresets(int size, double from, double to) { Randomizer randomizer = new Randomizer(); double [] presets = new double[size]; for(int i = 0 ; i

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