/**
 * An interface for iterators over the chars in a
 * string.  It is expected that implementers will have a
 * constructor that takes a string parameter--the string
 * over which to iterate.
 */
public interface CharIter {
  /**
   * Test whether there are more characters to go.
   * @return true if more chars (next can be called)
   */
  boolean hasNext();

  /**
   * Get the next char in the string.  This should be
   * called only if there is a next char--see hasNext.
   * @return the next char
   */
  char next();
}