3. Traditional thread Mutex technology

thread safety issues can be explained by bank transfer

1 /**2 * Traditional thread Mutex technology3  * @authorlitaiqing4  */5  Public classtraditionalthreadsynchronized {6     7      Public Static voidMain (string[] args) {8         Newtraditionalthreadsynchronized (). Init ();9     }Ten      One     Private voidinit () { A         /** - * Internal classes access local variables, local variables must be final - * If this code is in main error, because static code block can not access the inner class the          */ -         FinalOutputer Outputer =NewOutputer (); -         NewThread (NewRunnable () { - @Override +              Public voidrun () { -                  while(true){ +                     Try { AThread.Sleep (1000); at}Catch(interruptedexception e) { - e.printstacktrace (); -                     } -Outputer.output ("Zhangxiaoxiang"); -                 } -             } in }). Start (); -         NewThread (NewRunnable () { to @Override +              Public voidrun () { -                  while(true){ the                     Try { *Thread.Sleep (1000); $}Catch(interruptedexception e) {Panax Notoginseng e.printstacktrace (); -                     } theOutputer.output ("Lihuoming"); +                 } A             } the }). Start (); +     } -      $     Static classoutputer{ $          Public voidoutput (String name) { -             intLen =name.length (); -             /* the * Locks are done with either object, but only the same object is mutually exclusive - * 1. Each class has only one copy of the bytecode file, which can be used for mutual exclusion lockWuyi * 2. Use this also line the * This can also be synchroized on the method shelves, - * But from the perspective of multithreading efficiency, reasonable refinement of the synchronization block granularity can improve the execution efficiency, Wu * So it's better to add synchroized in the internal code -              */ About             synchronized(Outputer.class){ $                  for(inti = 0; i < Len; i++){ - System.out.print (Name.charat (i)); -                 } - System.out.println (); A             } +         } the         /** - * The Output2 method is not synchronized because the method is added synchronized equals the This lock $ * But the static method, so this will fail, there will be problems.  the          * @paramname the          */ the          Public Static synchronized voidoutput2 (String name) { the             intLen =name.length (); -             synchronized(Outputer.class){ in                  for(inti = 0; i < Len; i++){ the System.out.print (Name.charat (i)); the                 } About System.out.println (); the             } the         } the     } +}

3. Traditional thread Mutex technology