执行程序没有运行所有的线程。(Executors are not running all the threads.)

 我是Java新手，我正在尝试这个。 我有方法，我希望并行运行该方法。 我希望应该有10个线程调用该方法并获得结果。 
 
 我正在使用Callable和Executors 。 我正在创建线程池： 
 
 ExecutorService executor = Executors.newFixedThreadPool(10);
 
 当我这样做时： 
 
 executor.invokeAll(taskList);
 
 在10个线程中，只有1个线程被从轮询中取出。 我只得到这印： 
 
The current thread is pool-1-thread-1
 
 但我希望应该有10个类似的println声明。 
 
 以下是完整的代码： 
 
import java.util.concurrent.Callable;
import java.util.List;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.Future;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;

public class Parallel
{
    public static void main(String args[])
    {
        Learning l = new Learning();
        l.message = "1st Object";
        l.testThread();
    }
}

//this class deals with threads
class Learning
{

    public String message;

    public void setMessage(String message)
    {
        this.message = message;
    }

    //contains the code where
    public void testThread()
    {

       //create a callable for each method
       Callable<String> callable1 = new Callable<String>()
       {
          @Override
          public String call() throws Exception
          {
             System.out.println("The current thread is " + Thread.currentThread().getName());
             return method1();
             // return null;
          }
       };


       //add to a list
       List<Callable<String>> taskList = new ArrayList<Callable<String>>();
       taskList.add(callable1);

       //create a pool executor with 10 threads
       ExecutorService executor = Executors.newFixedThreadPool(10);


       try
       {
         List<Future<String>> futureList = executor.invokeAll(taskList);

       }
       catch (InterruptedException ie)
       {
       }
    }

    //put your code here!
    private String method1()
    {
        return Thread.currentThread().getName();
    }
}
 
 我在这里错过了什么吗？ 

I'm new to Java, and I'm trying this. I have method, which I wish to run that method in parallel. I wish there should be 10 threads calling the method and get their results. 
 
I'm using Callable and Executors for that. I'm creating the thread pool as:
 
 ExecutorService executor = Executors.newFixedThreadPool(10);
 
and I when I do this:
 
 executor.invokeAll(taskList);
 
out of 10 threads, only 1 thread is been taken from the poll. And I get only this printed:
 
The current thread is pool-1-thread-1
 
But I wish there should be 10 similar println statements. 
 
Here is the full code:
 
import java.util.concurrent.Callable;
import java.util.List;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.Future;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutorCompletionService;

public class Parallel
{
    public static void main(String args[])
    {
        Learning l = new Learning();
        l.message = "1st Object";
        l.testThread();
    }
}

//this class deals with threads
class Learning
{

    public String message;

    public void setMessage(String message)
    {
        this.message = message;
    }

    //contains the code where
    public void testThread()
    {

       //create a callable for each method
       Callable<String> callable1 = new Callable<String>()
       {
          @Override
          public String call() throws Exception
          {
             System.out.println("The current thread is " + Thread.currentThread().getName());
             return method1();
             // return null;
          }
       };


       //add to a list
       List<Callable<String>> taskList = new ArrayList<Callable<String>>();
       taskList.add(callable1);

       //create a pool executor with 10 threads
       ExecutorService executor = Executors.newFixedThreadPool(10);


       try
       {
         List<Future<String>> futureList = executor.invokeAll(taskList);

       }
       catch (InterruptedException ie)
       {
       }
    }

    //put your code here!
    private String method1()
    {
        return Thread.currentThread().getName();
    }
}
 
Am I missing something here? 

原文：https://stackoverflow.com/questions/20416223