谁能解释为什么作者不关闭流LineNumberReader lnr?没必要吗?

protected static ArrayList<Mount> getMounts() throws Exception{
    LineNumberReader lnr = null;
    lnr = new LineNumberReader(new FileReader("/proc/mounts"));
    String line;
    ArrayList<Mount> mounts = new ArrayList<Mount>();
    while ((line = lnr.readLine()) != null)
    {
        RootTools.log(line);

        String[] fields = line.split(" ");
        mounts.add(new Mount(new File(fields[0]), // device
            new File(fields[1]), // mountPoint
            fields[2], // fstype
            fields[3] // flags
        ));
    }
    InternalVariables.mounts = mounts;

    if (InternalVariables.mounts != null) {
        return InternalVariables.mounts;
    } else {
        throw new Exception();
    }
}


此外,在以前的版本中是:

finally {
    //no need to do anything here.
}


source code

这是错误还是细节?

最佳答案

从技术上讲,这是没有必要的,因为当对象超出范围时,它将被GC删除,并且拆卸过程可能会将其关闭。为了确保安全,关闭所有打开的I / O流被认为是一种好习惯。

10-04 19:29