Application of 10.Callable and future

1 ImportJava.util.Random;2 Importjava.util.concurrent.Callable;3 ImportJava.util.concurrent.CompletionService;4 Importjava.util.concurrent.ExecutionException;5 ImportJava.util.concurrent.ExecutorCompletionService;6 ImportJava.util.concurrent.ExecutorService;7 Importjava.util.concurrent.Executors;8 Importjava.util.concurrent.Future;9 Ten /** One * Application of callable and future A * The result type obtained by the future must be the same as the result type returned by callable, which is implemented by generics.  - * Callable to be submitted using the Executorservice Submit method, the returned future object can cancel the task.  - * Completionservice is used to submit a set of callable tasks whose take method returns the corresponding future object for a completed callable task.  the  * @authorlitaiqing -  * -  */ -  Public classCallableandfuture { +      -      Public Static voidMain (string[] args) { +          AExecutorservice ThreadPool =executors.newsinglethreadexecutor (); atfuture<string> future = -         //With submit when returning results -Threadpool.submit (NewCallable<string>(){ - @Override -              PublicString Call ()throwsException { -                 return"Hello"; in             } -              to         }); +          -System.out.println ("Wait for results"); the         Try { *System.out.println ("Get Results" +future.get ()); $}Catch(interruptedexception e) {Panax Notoginseng e.printstacktrace (); -}Catch(executionexception e) { the e.printstacktrace (); +         } A          theExecutorservice threadPool2 = Executors.newfixedthreadpool (10); +Completionservice<integer> Completionservice =NewExecutorcompletionservice<integer>(threadPool2); -          for(inti = 1; I < 10; i++){ $             Final intSeq =i; $Completionservice.submit (NewCallable<integer>(){ - @Override -                  PublicInteger Call ()throwsException { theThread.Sleep (NewRandom (). Nextint (5000)); -                     returnseq;Wuyi                 } the                  -             }); Wu         } -          About          for(inti = 0; I < 10; i++){ $             Try { - System.out.println (Completionservice.take (). get ()); -}Catch(interruptedexception e) { - e.printstacktrace (); A}Catch(executionexception e) { + e.printstacktrace (); the             }; -         } $          the     } the      the}

Application of 10.Callable and future