Java concurrency programming (10) exception handling of task result of thread pool

1.1. exception handling for task results

If an exception occurs during the execution of a task, the get () method produces executionexception.

Executorservice Executorservice = Executors.newfixedthreadpool (2); future<Integer> future = Executorservice.submit (Newcallable () {@Override publicInteger Call ()throwsException {Throw NewRuntimeException ("some exception.");//return 1;}  }); Try {intRET =Future.get (); System.out.println ("return:" +ret);} Catch(interruptedexception e) {e.printstacktrace ();}Catch(executionexception e) {e.printstacktrace ();}

java.util.concurrent.ExecutionException: java.lang.RuntimeException: some Exception.

At Java.util.concurrent.FutureTask.report (Unknown Source)

At Java.util.concurrent.FutureTask.get (Unknown Source)

At Com.test.concurrence.ThreadPoolTest.testFutureThreadPool (threadpooltest.java:34)

At Com.test.concurrence.ThreadPoolTest.main (threadpooltest.java:16)

caused by: java.lang.RuntimeException: some Exception.

At Com.test.concurrence.threadpooltest$1.call (threadpooltest.java:26)

At Com.test.concurrence.threadpooltest$1.call (threadpooltest.java:1)

At Java.util.concurrent.FutureTask.run (Unknown Source)

At Java.util.concurrent.ThreadPoolExecutor.runWorker (Unknown Source)

At Java.util.concurrent.threadpoolexecutor$worker.run (Unknown Source)

At Java.lang.Thread.run (Unknown Source)

if the thread is interrupted during the execution of the task, the Get () method produces Interruptedexception.

when sleep ()/wait () is known during the execution of a task , if the shutdownnow () method executes,get snaps to Sleep () produced by interruptexception , but is through executionexception the way to produce rather than interruptedexception the Way.

Executorservice Executorservice = Executors.newfixedthreadpool (2); future<Integer> future = Executorservice.submit (Newcallable () {@Override publicInteger Call ()throwsException {thread.sleep (1000*10); System.out.println ("------after sleep----------");return1;} });  Executorservice.shutdownnow (); Try {intRET =Future.get (); System.out.println ("return:" +ret);} Catch(interruptedexception e) {System.out.println ("---------interrupted exception--------"); E.printstacktrace ();} Catch(executionexception e) {System.out.println ("---------execution exception--------"); E.printstacktrace ();} Catch(cancellationexception e) {System.out.println ("---------cancellation exception--------"); E.printstacktrace (); }

---------execution exception--------

java.util.concurrent.ExecutionException: java.lang.InterruptedException: Sleep Interrupted

At Java.util.concurrent.FutureTask.report (Unknown Source)

At Java.util.concurrent.FutureTask.get (Unknown Source)

At Com.test.concurrence.ThreadPoolTest.testFutureThreadPool (threadpooltest.java:39)

At Com.test.concurrence.ThreadPoolTest.main (threadpooltest.java:17)

caused by: java.lang.InterruptedException: Sleep Interrupted

At Java.lang.Thread.sleep (Native Method)

At Com.test.concurrence.threadpooltest$1.call (threadpooltest.java:27)

At Com.test.concurrence.threadpooltest$1.call (threadpooltest.java:1)

At Java.util.concurrent.FutureTask.run (Unknown Source)

At Java.util.concurrent.ThreadPoolExecutor.runWorker (Unknown Source)

At Java.util.concurrent.threadpoolexecutor$worker.run (Unknown Source)

At Java.lang.Thread.run (Unknown Source)

if the thread that calls the Get () method is interrupted, it causes the Get () method to produce interruptedexception.

Executorservice Executorservice = Executors.newfixedthreadpool (2);FinalThread Mainthread =Thread.CurrentThread (); future<Integer> future = Executorservice.submit (Newcallable () {@Override publicInteger Call ()throwsException {thread.sleep (1000*3); mainthread.interrupt ();return1;}  }); Try {intRET =Future.get (); System.out.println ("return:" +ret);} Catch(interruptedexception e) {System.out.println ("---------interrupted exception--------"); E.printstacktrace ();} Catch(executionexception e) {System.out.println ("---------execution exception--------"); E.printstacktrace ();} Catch(cancellationexception e) {System.out.println ("---------cancellation exception--------"); E.printstacktrace (); } 

---------interrupted exception--------

Java.lang.InterruptedException

At Java.util.concurrent.FutureTask.awaitDone (Unknown Source)

At Java.util.concurrent.FutureTask.get (Unknown Source)

At Com.test.concurrence.ThreadPoolTest.testFutureThreadPool (threadpooltest.java:38)

At Com.test.concurrence.ThreadPoolTest.main (threadpooltest.java:17)

Java concurrency programming (10) exception handling of task result of thread pool