Java Programming

Hellos All,

I have the following

import java.util.Scanner;

public class r3
{
public static void main(String[] args)
{

//declare variables
String userInput, workString = "";
int stringLength;
int numberVowels = 0;
char userChoice;
Scanner keyboard = new Scanner(System.in);
char[] vowelArray = {'a', 'e', 'i', 'o', 'u'};
boolean enterAString;

System.out.println("Would you like to enter a string");
enterAString = keyboard.nextBoolean();


//user input

while(enterAString)
{//begin loop
System.out.println("please enter a string");
userInput = keyboard.nextLine();
userInput = userInput.toLowerCase();
stringLength = userInput.length();

for(int i = 0; i < stringLength; ++i)
{
if((int)userInput.charAt(i) >= 97 && (int)userInput.charAt(i) <=122)
workString = workString + userInput.charAt(i);

}
/*

for(int i = 0; i < stringLength; ++i)
{
if(userInput.charAt(i) >= 'a' && userInput.charAt(i) <= 'z')
workString = workString + userInput.charAt(i);

}
*/
System.out.println(workString);

System.out.println("Please select\n"
+"a for number of vowels\n"
+"b for number of consonents\n"
+"c for number of vowels and consonents\n"
+"d to enter another string\n"
+"e to exit\n");


userChoice = ((keyboard.nextLine()).toLowerCase()).charAt(0);

System.out.println(userChoice);


//determin number of vowels
for(int i = 0; i < workString.length(); ++i)
for(int j = 0; j < vowelArray.length; ++j)
if(workString.charAt(i) == vowelArray[j])
numberVowels++;



switch(userChoice)
{
case 'a':
System.out.println("The number of vowels is: " + numberVowels);
break;
case 'b':
System.out.println("The number of consonents is: " + (workString.length() - numberVowels));
break;

case 'c':
System.out.println("The number of vowels and consonents is: " + workString.length());
break;

case 'd':
break;
case 'e':
enterAString = false;
break;
default:
System.out.println("Invalid input. Goodby.");
}//end switch

}//end loop

System.out.println("Thanks for playing");


}//end main
}//end class

So far it somewhat works fine, but for the number of consonents when printed. The number printed out is not equal to the string input by the user. The bigger the string gets the bigger the difference in the amount of consonants.

any help would be appretiated thanks