how to search for upper/lower case using string using JAVA!!!?

-I am trying to write a program that will examine each letter in the string and count how many time the upper-case letter 'E' appears, and how many times the lower-case letter 'e' appears.

-I also have to use a JOptionPane.showMessageDialog() to tell the user how many upper and lower case e's were in the string.

-This will be repeated until the user types the word "Stop".

please help if you can
what i have so far:

Code:

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public class Project0 {

        public static void main(String[] args) {
       
                String[] uppercase = {'E'};
                String[] lowercase = {'e'};
                String isOrIsNot, inputWord;
                       
                while (true) {
                        // This line asks the user for input by popping out a single window
                        // with text input
                        inputWord = JOptionPane.showInputDialog(null, "Please enter a sentence");
                       
                        if ( inputWord.equals("stop") )
                                System.exit(0);
                       
                        // if the inputWord is contained within uppercase or
                        // lowercase return true
                        if (wordIsThere(inputWord, lowercase))
                                isOrIsNot = "Number of lower case e's: ";

                        if (wordIsThere(inputword, uppercase))
                                isOrIsNot = "number of upper case e's: ";
                       
                        // Output to a JOptionPane window whether the word is on the list or not
                        JOptionPane.showMessageDialog(null, "The word " + inputWord + " " + isOrIsNot + " on the list.");
                }
        } //main

        public static boolean wordIsThere(String findMe, String[] theList) {
                for (int i=0; i<theList.length; ++i) {
                        if (findMe.equals(theList[i])) return true;
                }
               
                return false;
        } // wordIsThere
} // class Lab4Program1

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