The modification of static function of Java multithreading security problem

/* If the synchronization function is statically decorated, what is the lock used? Through validation, the discovery is not in this. This cannot be defined in a static method. static into memory is that there is no such object in memory, but there must be a corresponding bytecode file object for that class. Class name. Class The type of the object is a class-static synchronous method that uses a lock that is the bytecode file object of the class in which the method resides. class name. */classTicketImplementsrunnable{Private Static  intTick = 100; //Object obj = new Object ();    BooleanFlag =true;  Public  voidrun () {if(flag) { while(true)            {                synchronized (ticket.class) {if(tick>0)                    {                        Try{Thread.Sleep (10);}Catch(Exception e) {} System.out.println (Thread.CurrentThread (). GetName ()+ ".... Code:" + tick--); }                }            }        }        Else             while(true) show (); }     Public Static synchronized voidShow () {if(tick>0)        {            Try{Thread.Sleep (10);}Catch(Exception e) {} System.out.println (Thread.CurrentThread (). GetName ()+ ".... Show ....:" + tick--); }    }}classstaticmethoddemo{ Public Static voidMain (string[] args) {Ticket T=NewTicket (); Thread T1=NewThread (t); Thread T2=NewThread (t);        T1.start (); Try{Thread.Sleep (10);}Catch(Exception e) {} T.flag=false;    T2.start (); }}

Modification of the Java multithreading security problem static function