Wait (), notify (), Notifyall () Understanding and use

These three methods, because of the need to control control over the object (monitor), belong to object and not to the thread.

Wait () will hand over the object control that holds the object's thread and wait.

Notify () notifies a thread that is waiting for control of this object to continue running.

Nofifyall () Notifies all threads waiting for control of this object to continue running, which is dispatched by the operating system if there is more than one thread that is waiting for control of the object to wake up.

Attention:

1. Producers, consumers must operate on the same resource.

2. Whether you are executing an object's wait, notify, or Notifyall method, you must ensure that the currently running thread has control over the object (monitor)

Producers:

 Packagecom.currentPro.waitAndnotify;Importjava.util.ArrayList;Importjava.util.List; Public classProducerImplementsrunnable{PrivateList<integer> Taskqueue =NewArraylist<integer>(); //Quantity of production    Private Final intmax_capacity;  PublicProducer (list<integer> Sharedqueue,intsize) {         This. Taskqueue =Sharedqueue;  This. Max_capacity =size; } @Override Public voidrun () {intCounter = 1;  while(true)          {             Try             {               synchronized(taskqueue) { while(taskqueue.size () = =max_capacity) {System.out.println (' Queue is full ' + thread.currentthread (). GetName () + "is waiting, size:" +taskqueue.size ());                        Taskqueue.wait (); } thread.sleep (1000);                        Taskqueue.add (counter); System.out.println ("Produced:" +counter); Counter++; //Wake the waiting consumer, but the consumer is not able to get to the resource, dispatched by the system. Taskqueue.notifyall (); }             }              Catch(Interruptedexception ex) {ex.printstacktrace (); }          }       }    }

Consumers:

 Packagecom.currentPro.waitAndnotify;Importjava.util.List; Public classConsumerImplementsrunnable{Private FinalList<integer>Taskqueue;  PublicConsumer (list<integer>sharedqueue) {         This. Taskqueue =Sharedqueue; } @Override Public voidrun () { while(true)          {             Try             {                 synchronized(taskqueue) { while(Taskqueue.isempty ()) {System.out.println (' Queue is empty ' + thread.currentthread (). GetName () + "is waiting, size:" +taskqueue.size ());                        Taskqueue.wait (); } thread.sleep (1000); inti = (Integer) taskqueue.remove (0); System.out.println ("Consumed:" +i);                     Taskqueue.notifyall (); }             } Catch(Interruptedexception ex) {ex.printstacktrace (); }          }       }}

Test code:

 Packagecom.currentPro.waitAndnotify;Importjava.util.ArrayList;Importjava.util.List; Public classTest { Public Static voidMain (string[] args)throwsinterruptedexception {//shared ResourcesList<integer> Taskqueue =NewArraylist<integer>(); intMax_capacity = 5; //Create a producer threadThread producer =NewThread (NewProducer (taskqueue,max_capacity), "Producer"); //Create a consumer threadThread consumer =NewThread (NewConsumer (Taskqueue), "Consumer");        Consumer.start (); Thread.Sleep (2000);            Producer.start (); }}

Resources

http://longdick.iteye.com/blog/453615

http://howtodoinjava.com/core-java/multi-threading/how-to-work-with-wait-notify-and-notifyall-in-java/

Http://www.cnblogs.com/dolphin0520/p/3920385.html

Wait (), notify (), Notifyall () Understanding and use