싱글톤 패턴~~

private static Singletone instance;

public static synchronized Singletone getInstance(){

if(instance==null){

instance = new Singletone();

}

return instance;

}


 - Thread safe SingleTone pattern

public static Singleton getInstance()
{
  if (instance == null)
  {
    synchronized(Singleton.class) {
      instance = new Singleton();
    }
  }
  return instance;
}

- double - checked locking



Double-checked locking example

public static Singleton getInstance() { if (instance == null) { synchronized(Singleton.class) { //1 if (instance == null) //2 instance = new Singleton(); //3 } } return instance; }

참조 : http://www.ibm.com/developerworks/java/library/j-dcl.html?loc=dwmain