为什么我的线程不能使用Java ExecutorService并行运行？

Question

public class Test { 
    private ExecutorService executor = Executors.newFixedThreadPool(50); 

    public void startTenThreads() { 
     for (int i = 0; i < 10; i++) { 
      executor.execute(new FooWorker(i)); 
     } 
    } 

    private final class FooWorker implements Runnable { 
     private int threadNum; 

     public FooWorker(int threadNum) { 
      this.threadNum = threadNum; 
     } 

     public void run() { 
      System.out.println("Thread " + threadNum + " starting"); 
      Thread.sleep(60000); 
      System.out.println("Thread " + threadNum + " finished"); 
     } 
    } 
} 

我想这些线程并行运行，但是输出显示它不是并行运行，而是按顺序：

Thread 1 starting 
Thread 1 finished 
Thread 2 starting 
Thread 2 finished 
Thread 3 starting 
Thread 3 finished 
Thread 4 starting 
Thread 4 finished 
Thread 5 starting 
Thread 5 finished 
... 

我在做什么错？

编辑：发现问题，有人已经建立线程池的大小为1。该段代码工作作为写不编译罚款

Answer 1

您的代码。我猜你在代码中还有其他的东西，你没有在这里剪切/粘贴。这里是你编写的代码来编译。我测试了它，它适用于我。你的实际代码和下面的代码有什么区别？ （请原谅“TheadTest”中的错字）。

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

public class TheadTest { 

    private ExecutorService executor = Executors.newFixedThreadPool(50); 

    public void startTenThreads() { 
     for (int i = 0; i < 10; i++) { 
      executor.execute(new FooWorker(i)); 
     } 
    } 

    private final class FooWorker implements Runnable { 
     private int threadNum; 

     public FooWorker(int threadNum) { 
      this.threadNum = threadNum; 
     } 

     public void run() { 
      try { 
       System.out.println("Thread " + threadNum + " starting"); 
       Thread.sleep(60000); 
       System.out.println("Thread " + threadNum + " finished"); 
      } 
      catch (InterruptedException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    public static void main(String[] args) { 
     TheadTest tt = new TheadTest(); 
     tt.startTenThreads(); 
    } 

}