Edited EmailAndGrade (With Error)

package com.mkyong.regex;
import javax.swing.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EmailAndGrade
{


    String sEmail = JOptionPane.showInputDialog("Enter your email: ");


    public static void main(String[] args)
    {
        //Variables

        System.exit(0);


    }

    static boolean validEmail(String sEmail){
            return sEmail.matches("[A-Z0-9]{7}+@[springfieldcollege]+\\.[edu]");
        }


     void checkEmails(){


        String sError, sEmailAddresses;

        validEmail(sEmailAddresses);

        for(String sEmail : sEmailAddresses) {
            if(validEmail(sEmail)) {
                // it's a good email - do something good with it
                String sTest = JOptionPane.showInputDialog("Enter in Test Score");
                int iTest = Integer.parseInt(sTest);
                char cGrade;
                String sEmailOutput = "For User: " + sEmail;

                String sGrade, sOutput;

                if (iTest >= 90){
                    cGrade = 'A';}
                    else if (iTest >= 80){
                    cGrade = 'B';}
                    else if (iTest >= 70){
                    cGrade = 'C';}
                    else if (iTest >= 60){
                    cGrade = 'D';}
                    else {
                    cGrade = 'F';}

                    sGrade = Character.toString(cGrade);

                    sOutput = sEmailOutput +
                              "\nEmail is: Valid" +
                              "\nTest Score is: " + iTest +
                              "\nLetter Grade is: " + sGrade;

                    JOptionPane.showMessageDialog(null,
                                      Output,
                                      "Email and Grade - Killian O'Brien",
                                                          JOptionPane.INFORMATION_MESSAGE);
                    }
            else {
                // it's a bad email - do something... bad to it? sounds dirty...

                String sEmailOutput = "For User: " + sEmail;

                sError = sEmailOutput +
                        "One or More Errors with the Input Email.\n" +
                        "Email is Empty.\n" +
                        "Email must be less than 30 characters.\n" +
                        "Must end in: @springfieldcollege.edu.\n" +
                        "Can only have one @.\n" +
                        "Must start with A through Z or a through z.\n" +
                        "Can not have: # $ % & ,\n ";

                JOptionPane.showMessageDialog(null,
                                  sError,
                                  "Email Error - Killian O'Brien",
                                                  JOptionPane.INFORMATION_MESSAGE);
                 }
             }
            }




}



N:\Programming\Java\Homework\EmailAndGrade.java:44: foreach not applicable to expression type
        for(String sEmail : sEmailAddresses) {
                            ^
1 error