// concurrent/CachedThreadPool.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.concurrent.*;
import java.util.stream.*;

public class CachedThreadPool {
  public static void main(String[] args) {
    ExecutorService exec =
      Executors.newCachedThreadPool();
    IntStream.range(0, 10)
      .mapToObj(NapTask::new)
      .forEach(exec::execute);
    exec.shutdown();
  }
}
/* Output:
NapTask[1] pool-1-thread-2
NapTask[5] pool-1-thread-6
NapTask[4] pool-1-thread-5
NapTask[8] pool-1-thread-9
NapTask[0] pool-1-thread-1
NapTask[9] pool-1-thread-10
NapTask[2] pool-1-thread-3
NapTask[3] pool-1-thread-4
NapTask[6] pool-1-thread-7
NapTask[7] pool-1-thread-8
*/