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final class Book {
  // May change its locking policy in the future to use private internal locks
  private final String title;
  private Calendar dateIssued;
  private Calendar dateDue;

  Book(String title) {
    this.title = title; 
  }
  
  public synchronized void issue(int days) {
    dateIssued = Calendar.getInstance();
    dateDue = Calendar.getInstance();
    dateDue.add(Calendar.DAY_OF_MONTHdateIssued.DATE, days);	 
  }

  public synchronized Calendar getDueDate() {
    return dateDue;
  }
}