import javax.swing.JOptionPane;

public class PetFoodArrow

$\{$

public static void main$($String$[]$ args$)$

$\{$

String input $=""$;

char foodGrade $=\text{'}\text{'}$;

foodGrade $=$ getInput$()$;

while$($foodGrade $!=\text{'}$X$\text{'})$

$\{$

input $=$ getGrade$($foodGrade$)$;

prinout$($foodGrade$,$ input$)$;

foodGrade $=$ getInput$()$;

$\}$

input $="$

End of the program!

$"$;

prinout$($foodGrade$,$ input$)$;

$\}$

$/*$

Methods' Definitions

$*/$

public static char getInput$()$

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String foodGradeInput;

String$[]$ mssgs $=\{$ "Our pet food is available in grades A$,$ B$,$ and C$.",$

"Which do you want pricing for? $\{$X to stop$\}$: $"\}$;

foodGradeInput $=$ JOptionPane.showInputDialog$($mssgs$[0]+($char$)10+$ mssgs$[1])$;

return foodGradeInput.toUpperCase$().$charAt$(0)$;

$\}$

public static String getGrade$($char fudGrade$)$

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String iO $=""$;

String$[]$ messash $=\{"$

Food grade $","$ costs $30$ cents per lb$.$

$",$

$"$ costs $20$ cents per lb$.$

$","$ costs $15$ cents per lb$.$

$",$

$"$

Invalid choice.

$"\}$;

JOptionPane.showMessageDialog$($null$,$ iO$)$;

iO $=$ switch$($fudGrade$)$

$\{$

case $\text{'}$A$\text{'}->$ messash$[0]+$ fudGrade $+$ messash$[1]$;

case $\text{'}$B$\text{'}->$ messash$[0]+$ fudGrade $+$ messash$[2]$;

case $\text{'}$C$\text{'}->$ messash$[0]+$ fudGrade $+$ messash$[3]$;

default $->$ messash$[4]$;

$\}$;

return iO;

$\}$

public static void prinout$($char fudGr, String incoming$)$

$\{$

if$($fudGr $!=\text{'}$X$\text{'})$

System.out.println$($incoming$)$;

else

System.out.println$($incoming$)$;

$\}$

$\}$

$/**$

Average class

$*/$

public class Average

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private double akkum;

private int Count;

public Average$()//$ Constructor; initializes the class fields

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akkum $=0\mathrm{.}0$;

Count $=0$;

$\}$

public void setSum$($double num$1)//$ Mutator Method $($Setter$)$

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akkum $+=$ num$1$; $//$ This double field is accumulating the values of the numbers entered

$\}$

public void setCount$()//$ Mutator Method $($Setter$)$

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Count$++$; $//$ This integer counts how many values have been read

$\}$

public double getSum$()//$ Accessor Method $($Getter$)$

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return akkum; $//$ This double value represents the sum of all the numbers to be averaged

$\}$

public int getCount$()//$ Accessor Method $($Getter$)$

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return Count; $//$ This integer value represents how many numbers have been entered

$\}$

public double getAvg$()//$ Accessor Method $($Getter$)$

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return akkum $/$ Count; $//$ This double value represents the calculated Average; prevents stale data

$\}$

$\}$