singleton

• sanirim ilk olarak gof (gang of four) diye adlandirlan bir dörtlü ekip tarafindan "design patterns" kitabinda yayinlanmistir.
  bir de thread-safe versiyonu vardir:
  
  pubic class singleton{
  private final static theinstance = new singleton();
  private singleton() {
  }
  public static singleton getinstance() {
  return theinstance;
  }
  }
  
  yada:
  
  class singleton{
  private final static theinstance;
  private singleton() {
  }
  public synchronized static singleton getinstance() {
  if (theinstance == null) {
  theinstance = new singleton();
  }
  return theinstance;
  }
  }