When I close a BufferedInputStream, is the underlying InputStream also closed?

java inputstream bufferedinputstream
Graham Borland picture Graham Borland · Jun 23, 2014 · Viewed 8.8k times · Source 
InputStream in = SomeClass.getInputStream(...);
BufferedInputStream bis = new BufferedInputStream(in);

try {
    // read data from bis
} finally {
    bis.close();
    in.close();    
}

The javadoc for BufferedInputStream.close() doesn't mention whether or not the underlying stream is closed:

Closes this input stream and releases any system resources associated with the stream. Once the stream has been closed, further read(), available(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

Is the explicit call to in.close() necessary, or should it be closed by the call to bis.close()?

Answer

omu_negru picture omu_negru · Jun 23, 2014

From the source code of BufferedInputStream : 

public void close() throws IOException {
    byte[] buffer;
    while ( (buffer = buf) != null) {
        if (bufUpdater.compareAndSet(this, buffer, null)) {
            InputStream input = in;
            in = null;
            if (input != null)
                input.close();
            return;
        }
        // Else retry in case a new buf was CASed in fill()
    }
}

So the answer would be : YES

Related questions

How to read all of Inputstream in Server Socket JAVA

I am using Java.net at one of my project. and I wrote a App Server that gets inputStream from a client. But some times my (buffered)InputStream can not get all of OutputStream that client sent to my server. …

Read More
How do I peek at the first two bytes in an InputStream?

Should be pretty simple: I have an InputStream where I want to peek at (not read) the first two bytes, i.e. I want the "current position" of the InputStream to stil be at 0 after my peeking. What is the …

Read More
Adding characters to beginning and end of InputStream in Java

I have an InputStream which I need to add characters to the beginning and end of, and should end up with another variable of type InputStream. How could I easily do this?

Read More