(2a) Model a physical entity as a Java Class (70 points) – focus on Encapsulatio
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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]
//////Please edit the code and follow the lab instruction. thank you.
////////////////////////////////////
package edu.cuny.csi.csc330.lab4;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.Scanner;
import edu.cuny.csi.csc330.lab4.Radio.Bands;
import edu.cuny.csi.csc330.lib.Randomizer;
public class Printer {
protected static final int MIN_PAPER = 0;
protected static final int MAX_PAPER = 500;
protected static final int MIN_INK = 0;
protected static final int MAX_INK = 100;
protected static final int MIN_PRINTED_PAPER = 0;
protected static final int MAX_PRINTED_PAPER = 50;
private Scanner input;
private Randomizer randomizer;
private boolean powerState;
private boolean staple = false;
private String serialNumber;
private int ink;
private int paper;
private int numComands;
private int selectedPapers[];
private Date firstTimeOn;
private Date lastTimeOn;
public Printer() {
init();
}
private void init() {
// serial number
Integer irand = randomizer.generateInt(11111111, 99999999);
this.serialNumber = new Date().getTime() + ":" + irand.toString();
}
private void on(boolean status) {
Date now = new Date();
// all the things we need to do the 1st time we turn on the instance ...
if(firstTimeOn == null) {
firstTimeOn = now;
// selectedVolume & station
setInk();
setPaper();
selectedPapers[numComands] = 0;
// tone and balance
selectedBalance = DEFAULT_BALANCE;
selectedTrebleLevel = DEFAULT_TREBLE;
selectedBassLevel = DEFAULT_BASS;
}
powerState = true;
lastTimeOn = now;
}
public Date getFirstTimeOn() {
return firstTimeOn;
}
public void off() {
powerState = false;
}
public boolean isOn() {
return powerState == true;
}
public void staple() {
staple = input.nextstring();
}
public void displayStatus() {
Format formatter=new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss z");
System.out.println(formatter.format(new Date()));
}
public int setInk() {
this.ink = randomizer.generateInt(MIN_INK, MAX_INK);
return ink;
}
public int setPaper() {
this.paper = randomizer.generateInt(MIN_PAPER, MAX_PAPER);
return paper;
}
public int[] getSelectedPapers() {
return selectedPapers;
}
public double getNumberComandsn() {
input = new Scanner(System.in);
numComands = input.nextInt();
return numComands;
}
public String toString() {
return "Printer Instance: "+", powerState=" + powerState + ", AmountInk="
+ ink + ", NumberOfPaper=" + paper
+ ", Numberofcommands =" + getNumberComandsn() + ", NumberOfpapers=" + getSelectedPapers()
+", firstTimeOn=" + firstTimeOn
+"Do you want your documents to be printed?(Y/N)"+staple
+ ", lastTimeOn=" + lastTimeOn
+ ", RemainingPapers= " + paper
+ ", RemainingInk=" + ink + " "+"";
}
public static void main(String[] args) {
// Create instance of - power up & down ... other ops, and
// display the powerState of the Radio instance
Printer printer = new Printer();
System.out.println("New Instance " + printer + " ");
// turn it on
printer.on();
System.out.println("Turned On " + printer + " ");
System.out.println("Changed Station " + printer + " ");
System.out.println("Assign Preset [1] to + " + printer.getSelectedBand() + " " + printer + " ");
// Turn off radio
printer.off();
System.out.println("Turned Off " + printer + " ");
}
}
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.text.Format;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.Scanner;
import edu.cuny.csi.csc330.lab4.Radio.Bands;
import edu.cuny.csi.csc330.lib.Randomizer;
public class Printer {
protected static final int MIN_PAPER = 0;
protected static final int MAX_PAPER = 500;
protected static final int MIN_INK = 0;
protected static final int MAX_INK = 100;
protected static final int MIN_PRINTED_PAPER = 0;
protected static final int MAX_PRINTED_PAPER = 50;
private Scanner input;
private Randomizer randomizer;
private boolean powerState;
private boolean staple = false;
private String serialNumber;
private int ink;
private int paper;
private int numComands;
private int selectedPapers[];
private Date firstTimeOn;
private Date lastTimeOn;
public Printer() {
init();
}
private void init() {
// serial number
Integer irand = randomizer.generateInt(11111111, 99999999);
this.serialNumber = new Date().getTime() + ":" + irand.toString();
}
private void on(boolean status) {
Date now = new Date();
// all the things we need to do the 1st time we turn on the instance ...
if(firstTimeOn == null) {
firstTimeOn = now;
// selectedVolume & station
setInk();
setPaper();
selectedPapers[numComands] = 0;
// tone and balance
selectedBalance = DEFAULT_BALANCE;
selectedTrebleLevel = DEFAULT_TREBLE;
selectedBassLevel = DEFAULT_BASS;
}
powerState = true;
lastTimeOn = now;
}
public Date getFirstTimeOn() {
return firstTimeOn;
}
public void off() {
powerState = false;
}
public boolean isOn() {
return powerState == true;
}
public void staple() {
staple = input.nextstring();
}
public void displayStatus() {
Format formatter=new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss z");
System.out.println(formatter.format(new Date()));
}
public int setInk() {
this.ink = randomizer.generateInt(MIN_INK, MAX_INK);
return ink;
}
public int setPaper() {
this.paper = randomizer.generateInt(MIN_PAPER, MAX_PAPER);
return paper;
}
public int[] getSelectedPapers() {
return selectedPapers;
}
public double getNumberComandsn() {
input = new Scanner(System.in);
numComands = input.nextInt();
return numComands;
}
public String toString() {
return "Printer Instance: "+", powerState=" + powerState + ", AmountInk="
+ ink + ", NumberOfPaper=" + paper
+ ", Numberofcommands =" + getNumberComandsn() + ", NumberOfpapers=" + getSelectedPapers()
+", firstTimeOn=" + firstTimeOn
+"Do you want your documents to be printed?(Y/N)"+staple
+ ", lastTimeOn=" + lastTimeOn
+ ", RemainingPapers= " + paper
+ ", RemainingInk=" + ink + " "+"";
}
public static void main(String[] args) {
// Create instance of - power up & down ... other ops, and
// display the powerState of the Radio instance
Printer printer = new Printer();
System.out.println("New Instance " + printer + " ");
// turn it on
printer.on();
System.out.println("Turned On " + printer + " ");
System.out.println("Changed Station " + printer + " ");
System.out.println("Assign Preset [1] to + " + printer.getSelectedBand() + " " + printer + " ");
// Turn off radio
printer.off();
System.out.println("Turned Off " + printer + " ");
}
}
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