CODEWITHSUNDEEP
javastreamtry-catch
Bon
Bon

Reputation: 250

Does DigestInputStream in a try-with-resources close the original InputStream?

Do I need to explicitly close the original InputStream if I declared a DigestInputStream in a try-with-resources block?

Example:

InputStream is = ...;
MessageDigest md = ...;

try (final DigestInputStream digestInputStream = new DigestInputStream(is, md)) {
    // Read the stream...
}

Do I need to close is manually or not?

Upvotes: 2

Views: 541

Answers (2)

CodeMatrix
CodeMatrix

Reputation: 2154

Because the DigestInputStream is an AutoCloseable you don't need to close it manually when you declared it in a try-with-resources block.

Docu from AutoCloseable:

The {@link #close()} method of an {@code AutoCloseable} object is called automatically when exiting a {@code try}-with-resources block for which the object has been declared in the resource specification header.

In addition, the FilterInputStream overrides theclose method which closes the used InputStream.

Upvotes: 3

talex
talex

Reputation: 20544

No. It will be closed automatically.

Here is source code from java.io.FilterInputStream:

public void close() throws IOException {
    in.close();
}

Upvotes: 1

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