Hello, thanks guys for the input. I know its kind of hard to help when you
can't see the code, so here it is.

public class MyString {

     // fields
 private int i = 0;
 private char ch;
 private String str;
 private boolean a = true;

    // methods

    // This method resets the index used to iterate through the string
    public void resetIndex() {
 i = 0;
 }

    // This method returns the reference to the string currently being
    // iterated through
    public String getString( ) {

         //*****

        // this return statement will need to be modified
        //System.out.println(a);
        return str;
    }

    // This methods returns the character at the current index and
    // increments the index
    public char nextChar( ) {

  while(i < str.length()) {
  ch = str.charAt(i);
  return ch;
  }
  i = i + 1;

  if(i == str.length()) {
   ch = '0';
   return ch;
  } else {
   ch = str.charAt(i);
  }

   return ch;
 }

    // This method returns true if the index is greater than the position
of
    // the last character in the string.  Otherwise, it returns false.
    public boolean noMore( ) {

  if( i == str.length()) {
   return true;
  }

  else if(i != str.length()) {
  }
   return false;

        // this return statement will need to be modified

    }

    // constructors
    // this constructor takes initializes the object with the String s
    // which will be iterated through
    public MyString( String s ) {
  //System.out.println(s);
  i = 0;
  str = s;
  if(s==null) {
   throw new NullPointerException();
  }

  //System.out.println(str);

 }
}

I am getting an runtime error. Here is the error
Exception in thread "main" java.lang.NullPointerException
       at MyString.<init>(MyString.java:88)
       at TestMyString.main(TestMyString.java:73)
Press any key to continue . . .
I have used println calls throughout the program to try to find the problem;
however, not any luck yet. Well if someone can see see something obivious;
please point it out. Thanks again in advance.