java - 如何在 Java 中关闭隐式流？

Question

Files.walk 是我应该关闭的流之一，但是，如何在如下代码中关闭流？下面的代码是否有效，或者我是否需要重写它以便我可以访问流以关闭它？

List<Path> filesList = Files.walk(Paths.get(path)).filter(Files::isRegularFile ).collect(Collectors.toList());

Answer 1

您应该将它与 try-with-resource 一起使用:

try(Stream<Path> path = Files.walk(Paths.get(""))) {
    List<Path> fileList = path.filter(Files::isRegularFile)
                               .collect(Collectors.toList());
}

Files.walk 的apiNote 明确地读到:

This method must be used within a try-with-resources statement or similar
control structure to ensure that the stream's open directories are closed
promptly after the stream's operations have completed.