Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about how to describe thread wait and notify through an example. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Scenario: in a class, one is the method to add elements to the container, the other is to return the container size, and now there are two threads, thread A calls the add method, thread B calls the return container size method, and when the size is 5, the B thread prompts and ends.

The code can be copied directly, running:

Public class UseWaitAndNotify {volatile List list = new ArrayList (); / / Why volatile is used here, please see: https://my.oschina.net/u/4049911/blog/3121294 public void add (Object o) {list.add (o);} public int size () {return list.size () } public void useWaitAndNotify () {new Thread (new Runnable () {@ Override public void run () {synchronized (this) {System.out.println ("size method start") / * it has to be not equal to 5, because it must not be equal to 5 at first, and then it will enter this method, execute the wait method, and the thread will wait at wait. * then cpu executes another method, and when the execution of another method equals 5, use notify to wake up waiting threads (threads waiting for the same lock). * then execute it down from the wait method to the end. * / if (list.size ()! = 5) {try {wait ();} catch (InterruptedException e) {/ / TODO Auto-generated catch block e.printStackTrace () }} System.out.println ("end of size method");}) .start (); synchronized (this) {System.out.println ("start of add method"); for (int iTuno switch I)

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