In Java need to write a program in main(): • getFootValue() returns a double val

Question

In Java need to write a program in main():
•   getFootValue() returns a double value that is entered.
•   getInchValue() returns 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
After: Need to write exceptions if the values are invalid and these values are checked and handled by a try/catch block.
•   NegativeNumberException (if the foot or inch inputvalue 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. When catching the NumberFormatException, you will then throw your own NonDigitNumberException which will be caught by the try/catch block.

Run examples:
Enter the foot value: 2
Enter the inch value: 12
Your result = 91.44

Enter the foot value: Kate
A Non-Digit foot value has been entered.
Please enter the values again.
Enter the foot value: 2
Enter the inch value: Hello
A Non-Digit inch value has been entered.
Please enter the values again.
Enter the foot value: 2
Enter the inch value: 12
Your result = 91.44

Explanation / Answer

ConvertToCentimetersTest.java

import java.util.InputMismatchException;
import java.util.Scanner;

public class ConvertToCentimetersTest {

  
   public static void main(String[] args) {
       Scanner scan = new Scanner(System.in);
       double cm = -1;
       while(cm==-1){
       cm = convertToCentimeters(scan);
      
       if(cm!=-1){
       System.out.println("Your result = " +cm);
       }
       else{
           System.out.println("Please enter the values again.");
       }
       scan.nextLine();
       }
   }
   public static double convertToCentimeters(Scanner scan){
       double centimeters = -1;
       try{
           double foot = getFootValue(scan);
           double inche = getInchValue(scan);
           double totalInches = foot * 12 + inche;
           centimeters = totalInches* 2.54;
          
           }catch(NegativeNumberException e1){
               System.out.println(e1);
           }
           catch(NonDigitNumberException e2){
               System.out.println(e2);
           }
           return centimeters;
   }
   public static double getFootValue(Scanner scan) throws NegativeNumberException, NonDigitNumberException{
       try{
       System.out.println("Enter the foot value: ");
       double foot = scan.nextDouble();
       if(foot <= 0){
           throw new NegativeNumberException ("A Negative foot value has been entered");
       }
       return foot;
       }
       catch(InputMismatchException e){
           throw new NonDigitNumberException ("A Non-Digit foot value has been entered.");
       }
   }
   public static double getInchValue(Scanner scan)throws NegativeNumberException, NonDigitNumberException{
   try{
       System.out.println("Enter the inche value: ");
       double inche = scan.nextDouble();
       if(inche <= 0){
           throw new NegativeNumberException ("A Negative inche value has been entered");
       }
       return inche;
       }
       catch(InputMismatchException e){
           throw new NonDigitNumberException ("A Non-Digit inche value has been entered.");
       }
   }
}

NegativeNumberException.java

public class NegativeNumberException extends Exception{
   String errorMsg ;
   public NegativeNumberException(String s){
       this.errorMsg = s;
   }
public String toString(){
return (errorMsg ) ;
}  
}

NonDigitNumberException.java

public class NonDigitNumberException extends Exception{
   String errorMsg ;
   public NonDigitNumberException(String s){
       this.errorMsg = s;
   }
public String toString(){
return (errorMsg ) ;
}  
}

Output:

Enter the foot value:
Kate
A Non-Digit foot value has been entered.
Please enter the values again.
Enter the foot value:
2
Enter the inche value:
Hello
A Non-Digit inche value has been entered.
Please enter the values again.
Enter the foot value:
2
Enter the inche value:
12
Your result = 91.44

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