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Sharing of

Multi-threaded operation of the same data, resulting in thread safety issues

Create a new class Sharedata

Design a member variable of type int count

Design a member Method Addcount (), put the count variable + +

Open multiple thread operations in the main function This member variable, in the main function

Get Sharedata object, new out

Use for loop 10 times, open threads in a loop, simulate 10 threads concurrently, within a loop

Get the Thread object, new out, constructor parameter: Runable Object

Anonymous inner class implements the Runable interface, overriding the Run () method

Call Thread.Sleep (1000) to make the thread sleep for one second, increasing the probability of a problem

Using the For loop 100 times, call the Addcount () method

Call Thread.Sleep (3), the main program sleeps for 3 seconds, to ensure that the above thread is all done

Print Count variable

Call the Start () method of the Thread object

 PackageCom.tsh.mthread; Public classHome { Public intcount;  Public Static voidMain (string[] args) {FinalHome Home =NewHome ();  for(inti = 0; I < 10; i++) {Thread T=NewThread (NewRunnable () {@Override Public voidrun () { for(intj = 0; J < 100; J + +) {home.addcount (); }                    Try{Thread.Sleep (1000); } Catch(Exception e) {e.printstacktrace (); } System.out.println (Thread.CurrentThread ()+":"+home.count);            }            });        T.start (); }        //sleep three seconds, wait up the top.        Try{Thread.Sleep (3000); } Catch(Exception e) {e.printstacktrace (); } System.out.println ("Total:" +home.count); }     Public voidAddcount () {count++; }}

Mutex compatibility

Use the Synchronized keyword to decorate the above Addcount () method, which adds locks while the current thread is operating, allowing only one visitor to access the resource with uniqueness and exclusivity

     Public synchronized void Addcount () {            count+ +;    }

Decorating code blocks with synchronized

     Public void Addcount () {        synchronized (this) {            count+ +;        }    }

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