Re: Parallel processing using Executor?
On Aug 14, 12:15 pm, howa <howac...@gmail.com> wrote:
Hello,
I have a method, e.g. foo(int i), which take an integer i and do some
heavy processing
now, i want to find the summation of foo() of i = 1..10000, I want to
take the advantage of speedup by multithreads, then I use executors to
create the threads...,e.g.
public class Foobar implements Runnable {
public Foobar() {}
public void run() {
System.out.println("thread is running...");
}
public int foo(int i) {
//...
}
}
Executor tp = Executors.newFixedThreadPool(10);
for (int i =1; i <=10000; i++) {
tp.execute(new Foobar() );
}
but how can i get back the information return from the execute method,
i.e. from the foo(int i)?
Thanks...
Try this approach:
public class Foobar extends Callable<Integer> {
final int param;
public Foobar(int param) {
this.param = param;
}
public Integer call() {
return foo(param);
}
public int foo(int i) {
return i * 2;
}
}
public class Main {
public static void main(String..args) throws Exception {
Executor tp = Executors.newFixedThreadPool(10);
List<Future<Integer>> futureObjects = new
ArrayList<Future<Integer>>();
for (int i =1; i <=10000; i++) {
futureObjects.add(tp.execute(new Foobar(i)));
}
for (Future<Integer> result: futureObjects) {
System.out.println(result.get());
}
}
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