Is it necessary to close each nested OutputStream and Writer separately?

Question

I am writing a piece of code:

OutputStream outputStream = new FileOutputStream(createdFile);
GZIPOutputStream gzipOutputStream = new GZIPOutputStream(outputS         


        

Answer 1

If all of the streams have been instantiated then closing only the outermost is just fine.

The documentation on Closeable interface states that close method:

Closes this stream and releases any system resources associated with it.

The releasing system resources includes closing streams.

It also states that:

If the stream is already closed then invoking this method has no effect.

So if you close them explicitly afterwards, nothing wrong will happen.