Java Concurrency Runable,callable,future,futuretask

Reprinted from: http://www.cnblogs.com/dolphin0520/p/3949310.html

 PackageFuture_call;Importjava.util.concurrent.Callable;/*** Created by Luozhitao on 2017/8/10.*/ Public classTaskImplementsCallable<integer> {  //@Override     PublicInteger Call ()throwsException {System.out.println ("Child threads are being evaluated"); Thread.Sleep (10000); System.out.println ("Child Threads Sleep Complete"); intSum=0;  for(inti=0;i<100;i++) {sum+=i; }        returnsum; }}

1. Using Callable+future

 PackageFuture_call;Importjava.util.concurrent.*;/*** Created by Luozhitao on 2017/8/10.*/ Public classTask_test { Public Static voidmain (String [] args) {Executorservice Executorservice=Executors.newcachedthreadpool (); Task Task=NewTask (); Future<Integer> future=NULL; Try{           //Executorservice Future=Executorservice.submit (Task); System.out.println ("Before the thread pool closes");            Executorservice.shutdown (); System.out.println ("After the thread pool is closed"); }Catch(rejectedexecutionexception e) {System.out.println (e);} Try{Thread.Sleep (1000); }Catch(interruptedexception e) {e.printstacktrace ();} System.out.println ("Main thread is in the process of calculation"); Try{System.out.println (Future.get ()); }Catch(Interruptedexception e) {E.printstacktrace ();}Catch(executionexception e) {e.printstacktrace ();} }}

2. Using Callable+futuretask

 PackageFuture_call;Importjava.util.concurrent.*;/*** Created by Luozhitao on 2017/8/10.*/ Public classFuture_task1 { Public Static voidmain (String [] args) {Executorservice Executorservice=Executors.newcachedthreadpool (); Task Task=NewTask (); Futuretask<Integer> futuretask=NewFuturetask<integer>(Task); Try {            /*Executorservice.submit (Futuretask);            Executorservice.shutdown (); */Thread Thread=NewThread (Futuretask);        Thread.Start (); }Catch(rejectedexecutionexception e) {e.printstacktrace ();} Try{Thread.Sleep (1000); System.out.println ("Main thread sleep complete"); }Catch(interruptedexception e) {e.printstacktrace ();} Try{System.out.println (Futuretask.get ()); }Catch(Interruptedexception e) {E.printstacktrace ();}Catch(executionexception e) {e.printstacktrace ();} }}

Java Concurrency Runable,callable,future,futuretask