Its the basic convert feet and inches to centimeters... if user inputs neg numbe

Question

Its the basic convert feet and inches to centimeters... if user inputs neg numbers or characters instead of numbers, throw and handle exceptions. I am not sure that I did it right, but it does work. Only thing is, I need it to repeat itself if the wrong input is entered for both feet and inches until the user enters the correct input. 

Would offer more Karma, but I am about out of points. 

Thanks

import java.util.*;

public class Ch11Ex1
{
static Scanner console = new Scanner(System.in);

public static void main(String[] args)
{
double length_feet,length_inch,totalinches,centim;
double centi=2.54,inch=12;
String str;
{
try
{
System.out.print("Enter total feet: ");
length_feet = console.nextDouble();
if (length_feet < 0 )
throw new InputMismatchException ("Positive Number Required");
System.out.println();

System.out.print("Enter total inches: ");
length_inch = console.nextDouble();
if (length_inch < 0 )
throw new InputMismatchException ("Positive Number Required");
System.out.println();

totalinches = inch*length_feet+length_inch;
centim=centi*totalinches;
System.out.println("You have entered " + length_feet + " feet and " + length_inch + " inches." + " Equivalent in centimeters is " + centim + " centimeters" );

}
catch (Exception eRef)
{
if (eRef instanceof ArithmeticException)
System.out.println("Positive Numbers Only");
else if (eRef instanceof InputMismatchException)
System.out.println("Invalid Input!Please Enter Only Positive Numbers");



}
}
}
}

Explanation / Answer

fixed myself. Providing another solution if anyone needs to see:

//File One:Ch11Ex1


import java.util.*;
public class Ch11Ex1 {

static Scanner console = new Scanner(System.in);
public static void main(String[] args)
{
double feet,inches;
boolean done = false;
double conversion = 0;
double conversionb = 0;
double centimeters = 2.54;
double inchesPerFoot = 12.0;


do
{
try
{
System.out.println("Please enter the number of feet and the number of inches separated by a space");
feet = console.nextDouble();
inches = console.nextDouble();

if(feet < 0 || inches < 0)
throw new NegativeNumberException();

conversion = (inches * centimeters)+(feet * inchesPerFoot * centimeters);
conversionb = (inchesPerFoot * feet) + (inches);
System.out.printf("Total Number of Inches: %.0f",conversionb);
System.out.printf(" Total Number of Centimeters: %.2f",conversion);
done = true;
//System.out.println();

}
catch(NegativeNumberException nne)
{
System.out.println(nne.toString());
console.nextLine();
}
catch(InputMismatchException ime)
{
System.out.println("Please Enter only Positive Numbers " + ime.toString());
console.nextLine();
}

}while(!done);
}
}

//File Two: NegativeNumberException

public class NegativeNumberException extends Exception{ public NegativeNumberException()

{

super("Cannot enter a negative value");

}

public NegativeNumberException(String strMessage)

{ super(strMessage); }

}

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