Counting vowels, lines , and words need some major help thanx

[powerej]

I have gotten the part of counting how many words are in the string, but the vowels just seem alien to me. Ive tried so many things but never close to a correct answer. I know I need to use charAt() and length() some nested loops with do while and for, but cant seem to get headed in the right direction. Also when i click the cancel button my program is suppose to end and tell you how many lines were entered, a count of vowels from all lines ex) A-count : 4 , ... etc. but it gives me a null pointer exception. i am usually very good at figuring out my programming assignments but this one just loses me in every way, prob cause we haven't been taught any of this yet. ANY help is appreciated thank you.

 
   import javax.swing.*; // gets option pane
 
    public class Program4    {
 
       public static void main (String[] args)  {
 
      // local variables
         String userInput;
         int aCount = 0;
         int eCount = 0;
         int iCount = 0;
         int oCount = 0;
         int uCount = 0;    
            int length;
         int numberOfLines = 0;
         int numberOfChars = 0;
         char specificChar = ' ';
 
 
         do{ 
            userInput = JOptionPane.showInputDialog("Input a line to analyze or Cancel to quit.");
            String[] arr = userInput.split(" ");
            length = arr.length;
 
            for (int j = 0; j < userInput.length(); j++)
                // loop so many times to collect correct vowels ?      
 
 
               if (userInput == null)
            {
               JOptionPane.showMessageDialog(null, "Summary of all " + length + " analyzed.",
                     "Program 4 Summary (Edward Powers)", JOptionPane.PLAIN_MESSAGE);
               System.exit(0);
            }    
 
            JOptionPane.showMessageDialog(null, "Summary of all " + length + " analyzed.",
                     "Program 4 Summary (Edward Powers)", JOptionPane.PLAIN_MESSAGE);
 
         }while ( userInput != null);
 
      }
 
   }

[dmjpro]

I have gotten the part of counting how many words are in the string, but the vowels just seem alien to me. Ive tried so many things but never close to a correct answer. I know I need to use charAt() and length() some nested loops with do while and for, but cant seem to get headed in the right direction. Also when i click the cancel button my program is suppose to end and tell you how many lines were entered, a count of vowels from all lines ex) A-count : 4 , ... etc. but it gives me a null pointer exception. i am usually very good at figuring out my programming assignments but this one just loses me in every way, prob cause we haven't been taught any of this yet. ANY help is appreciated thank you.

 
   import javax.swing.*; // gets option pane
 
    public class Program4    {
 
       public static void main (String[] args)  {
 
      // local variables
         String userInput;
         int aCount = 0;
         int eCount = 0;
         int iCount = 0;
         int oCount = 0;
         int uCount = 0;    
            int length;
         int numberOfLines = 0;
         int numberOfChars = 0;
         char specificChar = ' ';
 
 
         do{ 
            userInput = JOptionPane.showInputDialog("Input a line to analyze or Cancel to quit.");
            String[] arr = userInput.split(" ");
            length = arr.length;
 
            for (int j = 0; j < userInput.length(); j++)
                // loop so many times to collect correct vowels ?      
 
 
               if (userInput == null)
            {
               JOptionPane.showMessageDialog(null, "Summary of all " + length + " analyzed.",
                     "Program 4 Summary (Edward Powers)", JOptionPane.PLAIN_MESSAGE);
               System.exit(0);
            }    
 
            JOptionPane.showMessageDialog(null, "Summary of all " + length + " analyzed.",
                     "Program 4 Summary (Edward Powers)", JOptionPane.PLAIN_MESSAGE);
 
         }while ( userInput != null);
 
      }
 
   }

I am not familiar with Swing, so I am giving you a sample code of counting the Vowels & Words in a Line.
Ok! :-)

-----------------------------------------------------------
Don't spoonfeed code.

Jos