Write an application from scratch where you are to write in

Write an application from scratch where you are to write in Java

the following methods to be used by the main():
getFootValue() returning a Double value that is entered
getInchValue() returning a Double value that is entered

convertToCentimeters() returns a Double value using the
calculated results from the getFootValue() and
getInchValue() which will be used as the input values for
the convertToCentimeters() method

Next: The Exceptions that will be thrown if the values are
invalid and these values are to be checked and handled
by a try/catch block…

Write the following Exceptions:

• NegativeNumberException (if the foot or inch input value are negative)

• NonDigitNumberException (if the foot or inch input value are non numeric)

In addition to checking for the NegativeNumberException, also check for a NumberFormatException for the foot or inch values that were entered incorrectly (For example: I enter a letter for an inch or foot value). When catching the NumberFormatException, you will then throw your own NonDigitNumberException which will be caught by the try/catch block.

Sample I/O

Enter the foot value: 2
Enter the inch value: 12
Your result = 91.44 cm // 2ft,12 inches converted to CM

Enter the foot value: Bill
A non-digit foot value has been entered Please enter the values again.
Enter the foot value: 2
Enter the Inch value: Blah
A non-digit inch value has been entered Please enter the values again.

Solution

// Convertor.java

import java.util.Scanner;;

public class Convertor {

   static Scanner sc = new Scanner(System.in);
   public static double getFootValue() throws NonDigitNumberException, NegativeNumberException
   {
       System.out.print(\"Enter the foot value: \");
       double d;
       String foot = sc.nextLine();
       try
       {
           d = Double.parseDouble(foot);
       }
       catch(NumberFormatException n)
       {
           throw(new NonDigitNumberException(\"foot\"));
       }
      
       if (d < 0)
       {
           throw(new NegativeNumberException(\"foot\"));
       }
      
       return d;
   }
  
   public static double getInchValue() throws NonDigitNumberException, NegativeNumberException
   {
       System.out.print(\"Enter the inch value: \");
       double d;
       String inch = sc.nextLine();
       try
       {
           d = Double.parseDouble(inch);
       }
       catch(NumberFormatException n)
       {
           throw(new NonDigitNumberException(\"inch\"));
       }
      
       if (d < 0)
       {
           throw(new NegativeNumberException(\"inch\"));
       }
      
       return d;
   }
  
   public static double convertToCentimeters(double foot, double inch)
   {
       return (foot*12 + inch)*2.54;
   }
  
   public static void main(String[] args)
   {
       double foot = 0;
       double inch = 0;
       try{
           foot = getFootValue();
           inch = getInchValue();
       }
       catch(NonDigitNumberException d)
       {
           System.out.println(d.getMessage());
       }
       catch(NegativeNumberException n)
       {
           System.out.println(n.getMessage());
       }
      
       System.out.println(\"Your result = \" + convertToCentimeters(foot, inch) + \" cm\");
   }
  
}

//NonDigitNumberException .java

public class NonDigitNumberException extends Exception {
   public NonDigitNumberException(){
       super(\"A non-digit foot value has been entered Please enter the values again.\");
}
  
   public NonDigitNumberException(String message){
   super(\"A non-digit \" + message + \" value has been entered Please enter the values again.\");
}
}

// NegativeNumberException.java

public class NegativeNumberException extends Exception{

   public NegativeNumberException(){
       super(\"A non negative value has been entered Please enter the values again.\");
}
  
   public NegativeNumberException(String message){
   super(\"A non negative \" + message + \" value has been entered Please enter the values again.\");
}
}