Perforce更改默认编辑器(Perforce changing the default editor)

 在谈论并发时，总是要区分线程和任务 非常重要 。 
 
 
 
 任务只是一件应该完成的工作 - 通常表示为Runnable （或者在任务产生结果的情况下为Callable ）。 
 
 
 线程是一种使任务能够并行执行的机制。 
 
 
 Executor或ExecutorService是能够执行任务的工具 。 根据实现的不同，这个执行器可能能够并行执行多个任务 - 通常通过在内部使用线程 。 
 
 因此，如果您使用的是Executor或ExecutorService ，那么您将交付任务 ，因此可以执行Runnable ，并让执行程序为您管理其线程 。 
 
 注意：由于java.lang.Thread实现了Runnable ，因此可以实例化一个Thread并将其传递给execute(...) 。 这是一件非常糟糕的事情，因为执行程序只会像调用任务一样调用线程的run()方法，而不会启动线程。 它不被认为是以这种方式使用 - 如果你看到这个地方：这是错的！ 

When talking about concurrency, it is very important to always distinguish between threads and tasks.
 
 
 
A task is just a piece of work that should be done - often represented as Runnable (or Callable in case a task produces a result).
 
 
A thread is a mechanism that enables tasks to be executed in parallel.
 
 
An Executor or ExecutorService is a facility that is able to execute tasks. Depending on the implementation, this executor may be able to execute multiple tasks in parallel - usually by using threads internally.
 
So if you are using an Executor or ExecutorService, you hand over tasks, hence Runnables for execution and let the executor manage its threads for you.
 
Note: As java.lang.Thread implements Runnable, it is possible to instantiate a Thread and pass it to execute(...). That's a very bad thing as the executor will just invoke the run() method of the thread as if it were a task, and does not start the thread. It is not thought to be used this way - if you see this somewhere: It's wrong!