有两个关于线程池的问题：
1，用Executors.newSingleThreadExecutor()创建的线程池的execute()方法 和 用Thread的start()方法有什么不同么?
2,  交通系统的教程里,有这样的代码,
  ExecutorService pool = Executors.newSingleThreadExecutor();
  pool.execute(new Runnable() {
   @Override
   public void run() {
    System.out.println(Thread.currentThread().getName());//我加上这句查看线程名字
    for (int i = 1; i < 1000; i++) {
     try {
      Thread.sleep((new Random().nextInt(10) + 1) * 1000);
      transportation.add(Road.this.name + "--" + i);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
    }
   }
  });
结果是:
pool-1-thread-1
pool-3-thread-1
pool-5-thread-1
pool-7-thread-1
pool-9-thread-1
pool-11-thread-1
pool-13-thread-1
pool-15-thread-1
pool-17-thread-1
pool-19-thread-1
pool-21-thread-1
pool-23-thread-1

换成Thread,
new Thread(new Runnable() {
   @Override
   public void run() {
    System.out.println(Thread.currentThread().getName());
    for (int i = 1; i < 1000; i++) {
     try {
      // Thread.sleep((long) (Math.random()*10));
      Thread.sleep((new Random().nextInt(10) + 1) * 1000);
      transportation.add(Road.this.name + "--" + i);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
    }
   }
  }).start();
结果是:
Thread-0
Thread-1
Thread-2
Thread-3
Thread-4
Thread-5
Thread-6
Thread-8
Thread-9
Thread-10
Thread-11

问题:为什么线程池的名字是1,3,5这样的跳呢?而且没看到Thread-0,是为什么

有两个关于线程池的问题：
1，用Executors.newSingleThreadExecutor()创建的线程池的execute()方法 和 用Thread的start()方法有什么不同么?
2,  交通系统的教程里,有这样的代码,
  ExecutorService pool = Executors.newSingleThreadExecutor();
  pool.execute(new Runnable() {
   @Override
   public void run() {
    System.out.println(Thread.currentThread().getName());//我加上这句查看线程名字
    for (int i = 1; i < 1000; i++) {
     try {
      Thread.sleep((new Random().nextInt(10) + 1) * 1000);
      transportation.add(Road.this.name + "--" + i);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
    }
   }
  });
结果是:
pool-1-thread-1
pool-3-thread-1
pool-5-thread-1
pool-7-thread-1
pool-9-thread-1
pool-11-thread-1
pool-13-thread-1
pool-15-thread-1
pool-17-thread-1
pool-19-thread-1
pool-21-thread-1
pool-23-thread-1

换成Thread,
new Thread(new Runnable() {
   @Override
   public void run() {
    System.out.println(Thread.currentThread().getName());
    for (int i = 1; i < 1000; i++) {
     try {
      // Thread.sleep((long) (Math.random()*10));
      Thread.sleep((new Random().nextInt(10) + 1) * 1000);
      transportation.add(Road.this.name + "--" + i);
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
    }
   }
  }).start();
结果是:
Thread-0
Thread-1
Thread-2
Thread-3
Thread-4
Thread-5
Thread-6
Thread-8
Thread-9
Thread-10
Thread-11

问题:为什么线程池的名字是1,3,5这样的跳呢?而且没看到Thread-0,是为什么