Multithreading--Reentrantlock

1.

1 /**2 * Lock.getholdcount () method: can only be used within the current calling thread and cannot be used in other threads3 * Then I can call the M2 method in the M1 method, while the M1 method and M2 method both hold lock locks to increase the number of test results Holdcount4  *5  */6  Public classTestholdcount {7 8     //re-entry lock9     PrivateReentrantlock lock =NewReentrantlock ();Ten      One      Public voidM1 () { A         Try { - Lock.lock (); -System.out.println ("Enter M1 method, Holdcount number is:" +Lock.getholdcount ()); the              -             //calling the M2 method - m2 (); -              +}Catch(Exception e) { - e.printstacktrace (); +}finally { A Lock.unlock (); at         } -     } -      -      Public voidm2 () { -         Try { - Lock.lock (); inSystem.out.println ("Enter M2 method, holdcount number is:" +Lock.getholdcount ()); -}Catch(Exception e) { to e.printstacktrace (); +}finally { - Lock.unlock (); the         } *     } $     Panax Notoginseng      -      Public Static voidMain (string[] args) { theTestholdcount THC =NewTestholdcount (); + thc.m1 (); A         /* the Enter the M1 method, the number of Holdcount is: 1 + Enter the M2 method, the number of Holdcount is: 2*/ -     } $}

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2.

1  Public classUsereentrantlock {2     3     PrivateLock lock =NewReentrantlock ();4     5      Public voidmethod1 () {6         Try {7 Lock.lock ();8System.out.println ("Current thread:" + thread.currentthread (). GetName () + "Enter method1 ...");9Thread.Sleep (1000);TenSystem.out.println ("Current thread:" + thread.currentthread (). GetName () + "Exit method1 ..."); OneThread.Sleep (1000); A}Catch(interruptedexception e) { - e.printstacktrace (); -}finally { the              - Lock.unlock (); -         } -     } +      -      Public voidmethod2 () { +         Try { A Lock.lock (); atSystem.out.println ("Current thread:" + thread.currentthread (). GetName () + "Enter method2 ..."); -Thread.Sleep (2000); -System.out.println ("Current thread:" + thread.currentthread (). GetName () + "Exit Method2 ..."); -Thread.Sleep (1000); -}Catch(interruptedexception e) { - e.printstacktrace (); in}finally { -              to Lock.unlock (); +         } -     } the      *      Public Static voidMain (string[] args) { $ Panax Notoginseng         FinalUsereentrantlock ur =NewUsereentrantlock (); -Thread T1 =NewThread (NewRunnable () { the @Override +              Public voidrun () { AUr.method1 ();//the same lock ur theUR.METHOD2 ();//the same lock ur +             } -}, "T1"); $  $ T1.start (); -         Try { -Thread.Sleep (10); the}Catch(interruptedexception e) { - e.printstacktrace ();Wuyi         } the         //System.out.println (Ur.lock.getQueueLength ()); -     } Wu     /* - Current thread: T1 into method1. About Current thread: T1 exit method1. $ Current thread: T1 into method2. - Current thread: T1 exit method2.*/ -      -}

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Multithreading--Reentrantlock