Closing wrapped resources in Java

Question

Consider the typical code:

try {
    FileReader fr = new FileReader("42.txt");
    BufferedReader br = new BufferedReader(fr);
} finally {
        //??
}

Should close in the finally clause be called for both or them or is it sufficient to close only one reader (if so, then which one?).

I would think that it should be sufficient to close only the most external wrapper, because with the following code that utilises try with resources only br will be closed:

try (BufferedReader br = new BufferedReader(new FileReader("42.txt"))) {
}

score 1 · Accepted Answer · answered Mar 02 '17 at 21:01

1

The outermost one. It will then call close() on the wrapped stream etc. if it's implemented correctly (which is certainly true for JDK classes).

answered Mar 02 '17 at 21:01

Kayaman

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Closing wrapped resources in Java

1 Answers1