爲什麼我的線程不能使用Java ExecutorService並行運行？

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"); 
     } 
    } 
} 

我想這些線程並行運行，但是輸出顯示它不是並行運行，而是按順序：

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 
... 

我在做什麼錯？

編輯：發現問題，有人已經建立線程池的大小爲1。該段代碼工作作爲寫不編譯罰款

Answer 1

您的代碼。我猜你在代碼中還有其他的東西，你沒有在這裏剪切/粘貼。這裏是你編寫的代碼來編譯。我測試了它，它適用於我。你的實際代碼和下面的代碼有什麼區別？ （請原諒「TheadTest」中的錯字）。

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(); 
    } 

}