Error while expected

   class HelpSystem {

       char menuItemNumber ;
       int subject;

        boolean isValid (int menuItemNumber) {

            if (menuItemNumber < '1' | menuItemNumber > '7' & menuItemNumber != 'q') return false;
            else return true;
        }

       void showMenu() {

           System.out.println("Help on: ");
           System.out.println("    1   if");
           System.out.println("    2   switch");
           System.out.println("    3   for");
           System.out.println("    4   while");
           System.out.println("    5    do-while\n");
           System.out.println("    6    Break");
           System.out.println("    7    Continue:\n");
           System.out.println("Choose one: (q te quit): ");
       }


       void helpOn (int subject) {
           switch (subject)

           {
               case '1':
                   System.out.println("The if:\n");
                   System.out.println("if(condition) statement;");
                   System.out.println("else statement");
                   break;
               case '2':
                   System.out.println("The switch:\n");
                   System.out.println("switch(expression) {");
                   System.out.println("    case constant:");
                   System.out.println("    statement sequence");
                   System.out.println("    break;");
                   System.out.println("    //  ...");
                   System.out.println("}");
               case '3':
                   System.out.println("The for:\n");
                   System.out.println("for (for(init; condition; iteration)");
                   System.out.println("    statement");
                   break;
               case '4':
                   System.out.println("The while: \n");
                   System.out.println("The white(condition) statement;");
                   break;
               case '5':
                   System.out.println("The do-while:\n");
                   System.out.println("do {");
                   System.out.println("    statement;");
                   System.out.println("} while (condition);");
                   break;
           }
       }








}

   class HelpClassDemo {
       public static void main(String args[])
               throws java.io.IOException {

           char subject, reject;
           HelpSystem helpObject = new HelpSystem();

           for (; ; ) {
               do {
                   helpObject.showMenu();
                   subject = (char) System.in.read();

                   do {
                       reject = (char) System.in.read();
                   } while (!helpObject.isValid(subject));
                   if (subject == 'q') break;

                   System.out.println("\n");

                   helpObject.helpOn(subject);


               }
       }
   }