Return a value from a thread.

   

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Main {
  public static void main(String args[]) throws Exception{
    ExecutorService es = Executors.newFixedThreadPool(3);
    Future<Double> f = es.submit(new Avg());
    Future<Integer> f2 = es.submit(new Factorial());

    System.out.println(f.get());
    System.out.println(f2.get());
    es.shutdown();
  }
}

class Avg implements Callable<Double> {
  Avg() {
  }

  public Double call() {
    return 0.0;
  }
}
class Factorial implements Callable<Integer> {
  Factorial() {
  }

  public Integer call() {
    return 1;
  }
}

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Return a value from a thread. : Collections Threads « Threads « Java

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