java - 当相应的 Stream 关​​闭时，Java FileChannel 锁是否关闭，或者我是否必须显式关闭它们？

Question

例如，我的代码目前看起来像下面这样。我需要显式调用 lock.release 还是在 FileOutputStream 关闭时自动释放？

var os:FileOutputStream = null
var writer:PrintWriter = null
try {
  os = new FileOutputStream(name, false)
  val lock = os.getChannel().tryLock
  if(lock != null) {
    writer = new PrintWriter(new BufferedWriter(new
      OutputStreamWriter(os)))
    (write stuff to file)
  } else {
    (error stuff)
  }
} finally {
  if(writer != null) writer.close
  os.close
}

Answer 1

根据 FileLock 的 javadoc :

"A file-lock object is initially valid. It remains valid until the lock is released by invoking the release method, by closing the channel that was used to acquire it, or by the termination of the Java virtual machine, whichever comes first."

...我假设关闭流会关闭底层 channel 。