multithreading - Exception handling in call method of Java executor framework -

wondering if there customized exception happening in call method, wondering best practice client exception? shall catch exception when call get method? or before call get method, exception thrown call method (from thread pool)? thanks.

i referring sample below,

http://www.vogella.com/tutorials/javaconcurrency/article.html

package de.vogella.concurrency.callables;  import java.util.concurrent.callable;  public class mycallable implements callable<long> {   @override   public long call() throws exception {     long sum = 0;     (long = 0; <= 100; i++) {       sum += i;     }     return sum;   }  }   package de.vogella.concurrency.callables;  import java.util.arraylist; import java.util.list; import java.util.concurrent.callable; import java.util.concurrent.executionexception; import java.util.concurrent.executorservice; import java.util.concurrent.executors; import java.util.concurrent.future;  public class callablefutures {   private static final int nthreds = 10;    public static void main(string[] args) {      executorservice executor = executors.newfixedthreadpool(nthreds);     list<future<long>> list = new arraylist<future<long>>();     (int = 0; < 20000; i++) {       callable<long> worker = new mycallable();       future<long> submit = executor.submit(worker);       list.add(submit);     }     long sum = 0;     system.out.println(list.size());     // retrieve result     (future<long> future : list) {       try {         sum += future.get();       } catch (interruptedexception e) {         e.printstacktrace();       } catch (executionexception e) {         e.printstacktrace();       }     }     system.out.println(sum);     executor.shutdown();   } }