3, traditional thread synchronization and communication--production and consumption examples

Core points:

1, the lock object must be the same. the 2, Wait (), and notify () methods must be methods that invoke the lock object, not this (thread). 3, in the multi-production and more consumption of attention to use Notifyall instead of notifyall, otherwise it will cause deadlock

Test code:

1 Importjava.util.LinkedList;2 ImportJava.util.Queue;3 ImportJava.util.Random;4 5 /**6 * Multiple production-consumer thread synchronous communication7 * Core points:8 * 1, the lock object must be the same. 9 * 2, wait (), and notify () methods must be methods that call the lock object, not this (thread). Ten * 3, in the multi-production and more consumption when the attention to use Notifyall instead of Notifyall One  * @authorYzl A  * -  */ -  Public classThreadpart_3 { the      Public Static voidMain (string[] args) { - test (); -     } -      Public Static voidTest () { +         FinalFactory Factory =NewFactory (); -Thread Shengchan1 =NewThread (NewRunnable () { + @Override A              Public voidrun () { at                  while(true){ - Factory.add (); -                 } -             } -         }); - Shengchan1.start (); inThread shengchan2 =NewThread (NewRunnable () { - @Override to              Public voidrun () { +                  while(true){ - Factory.add (); the                 } *             } $         });Panax Notoginseng Shengchan2.start (); -          theThread XIAOFEI1 =NewThread (NewRunnable () { + @Override A              Public voidrun () { the                  while(true){ + factory.sub (); -  $                 } $             } -         }); - Xiaofei1.start (); theThread Xiaofei2 =NewThread (NewRunnable () { - @OverrideWuyi              Public voidrun () { the                  while(true){ - factory.sub (); Wu                 } -             } About         }); $ Xiaofei2.start (); -     } - } -  A classfactory{ +     Privatequeue<integer> queue =NewLinkedlist<integer>(); the     //Production -      Public synchronized voidAdd () { $         //use while instead of if to prevent false wakeup the          while(Queue.size () > 0){ the             Try { the                  This. Wait (); the}Catch(interruptedexception e) { - e.printstacktrace (); in             } the         } theInteger val =NewRandom (). Nextint (100); About Queue.add (val); theSystem.out.println ("Producer:" + Thread.CurrentThread (). GetName () + "add:" +val); the          This. Notifyall (); the         Try { +Thread.Sleep (1000); -}Catch(interruptedexception e) { the e.printstacktrace ();Bayi         } the     } the     //Consumer -      Public synchronized voidSub () { -         //use while instead of if to prevent false wakeup the          while(queue.size () = = 0 ){ the             Try { the                  This. Wait (); the}Catch(interruptedexception e) { - e.printstacktrace (); the             } the         } theInteger val =Queue.poll ();94System.out.println ("Consumer:" + thread.currentthread (). GetName () + "Get:" +val); the          This. Notifyall (); the         Try { theThread.Sleep (1000);98}Catch(interruptedexception e) { About e.printstacktrace (); -         }101     }102}

Examples of running results:

1Producer: Thread-0 Add:122Consumer: Thread-3 Get:123Producer: Thread-1 add:844Consumer: Thread-2 get:845Producer: Thread-0 add:286Consumer: Thread-3 get:287Producer: Thread-1 add:608Consumer: Thread-2 get:609Producer: Thread-0 add:71TenConsumer: Thread-3 get:71 OneProducer: Thread-1 add:63 AConsumer: Thread-3 get:63 -Producer: Thread-0 Add:3 -Consumer: Thread-2 Get:3 theProducer: Thread-1 add:62 -Consumer: Thread-3 get:62 -Producer: Thread-0 add:90 -Consumer: Thread-2 get:90 +Producer: Thread-1 Add:9 -Consumer: Thread-3 Get:9

3, traditional thread synchronization and communication--production and consumption examples