// Textbook fragment 01.01
public class Counter {
  protected int count; // a simple integer instance variable
  /** The default constructor for a Counter object */
  Counter() { count = 0; }
  /** An accessor method to get the current count */
  public int getCount() { return count; }
  /** A modifier method for incrementing the count */
  public void incrementCount() { count++; }
  /** A modifier method for decrementing the count */
  public void decrementCount() {count--; }