public   class  SingletonImpl {
     private   static  SingletonImpl self =  null ;
     private   static   boolean  busy = false;
     private  SingletonImpl() {
         super ();
        // perform initialization here
        self =  this ;
    }
     public   static  SingletonImpl getInstance() {
         if  (self ==  null  & busy !=false){
             return  createIstanse();
        }
         else   return  self;
    }

     private   synchronized   static  SingletonImpl createIstanse() {
        busy=true;
         if  (self ==  null ) {
            self =  new  SingletonImpl();
        }
        busy = false;
         return  self;
    }
}