OnJava8-Examples/concurrent/Futures.java

// concurrent/Futures.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.concurrent.*;
import java.util.stream.*;

public class Futures {
  public static void main(String[] args)
    throws InterruptedException, ExecutionException {
    ExecutorService exec =
      Executors.newSingleThreadExecutor();
    Future<Integer> f =
      exec.submit(new CountingTask(99));
    System.out.println(f.get());               // [1]
    exec.shutdown();
  }
}
/* Output:
99 pool-1-thread-1 100
100
*/