[Technology Sharing]20180109_ Multithreading _ threadlocal Addressing thread safety issues (JDK 1.7)

There is a thread safety issue below:

 Public classTestsimpledateformat { Public Static voidMain (string[] args)throwsinterruptedexception, executionexception {//SimpleDateFormat sdf = new SimpleDateFormat ("YyyyMMdd");DateTimeFormatter DTF= Datetimeformatter.ofpattern ("YyyyMMdd");//Java 8 availablecallable<LocalDate> task =NewCallable<localdate>() {@Override PublicLocaldate Call ()throwsException {returnLocaldate.parse ("20180109", DTF);//Java 8 available//return Dateformatthreadlocal.convert ("20180109");            }                    }; List<Future<LocalDate>> list =NewArraylist<>(); Executorservice Pool= Executors.newfixedthreadpool (10);  for(inti=0;i<10;i++) {List.add (Pool.submit (Task)); }                 for(future<localdate>future:list)        {System.out.println (Future.get ()); } pool.shutdown ();    //Remember to close } }

Here is the Threadlocal class:

public class Dateformatthreadlocal {        private static final threadlocal<dateformat> tl = new threadlocal< Dateformat> () {                protected DateFormat InitialValue () {            return new SimpleDateFormat ("YyyyMMdd");        }            }; Public        static final Date convert (String source) throws parseexception{        return Tl.get (). Parse (source);}    }

[Technology Sharing]20180109_ Multithreading _ threadlocal Addressing thread safety issues (JDK 1.7)