Complete the following program to implement the user interface of the preceding exercise. For simplicity, only the uimport java.util.Scanner;

public class UnitConverter

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

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Scanner in $=$ new Scanner$($System$.$in$)$;

boolean done $=$ false;

double factor$1=1$;

double factor$2=1$;

String unit$1=""$;

String unit$2=""$;

while $(!$done$)$

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boolean getSecond $=$ true;

String command $=$ in$.$next$()$;

System.out.println$("$From unit $($in$,$ cm$,$ m$,$ again, quit$)$: $"+$ command$)$;

if $($command$.$equals$("$in$"))$

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factor$1=2\mathrm{.}54$; $//$ Convert to cm

unit$1=$ command;

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else if $($command$.$equals$("$cm$"))$

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factor$1=1$; $//$ Already in cm

unit$1=$ command;

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else if $($command$.$equals$("$m$"))$

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factor$1=100$; $//$ Convert to cm

unit$1=$ command;

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else if $($command$.$equals$("$again$"))$

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getSecond $=$ false;

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else if $($command$.$equals$("$quit$"))$

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done $=$ true;

getSecond $=$ false;

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else

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System.out.println$("$Sorry$,$ unknown unit.

$")$;

getSecond $=$ false;

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if $($getSecond$)$

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System.out.print$("$To unit: $")$;

unit$2=$ in$.$next$()$;

if $($unit$2.$equals$("$in$"))$

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System.out.println$($unit$2)$;

factor$2=2\mathrm{.}54$; $//$ Convert from cm

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else if $($unit$2.$equals$("$cm$"))$

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System.out.println$($unit$2)$;

factor$2=1$; $//$ Already in cm

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else if $($unit$2.$equals$("$m$"))$

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System.out.println$($unit$2)$;

factor$2=0\mathrm{.}01$; $//$ Convert from cm

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else

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System.out.println$("$Sorry$,$ unknown unit.

$")$;

getSecond $=$ false;

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if $($getSecond$)$

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double value $=$ in$.$nextDouble$()$;

double result $=$ value $*$ factor$1/$ factor$2$;

System.out.println$($value $+""+$ unit$1+"="+$ result $+""+$ unit$2+"$

$")$;

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$\}$nits cm$,$ m$,$ and in are supported.