Can't understand this block of code and need explanation?

from the CommonsWare Community archives

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At September 5, 2018, 12:30pm, hackzcorporation asked:

   InputStream in=c.getInputStream();
   byte[] buffer=new byte[8192];
   int len=0;
   while ((len=in.read(buffer)) >= 0) {
        out.write(buffer, 0, len);
    }

From Services and the Command Pattern, Scenario:The Downloader

I don’t know if this is the correct way or not for asking for the code explanation where I’m stuck!

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At September 5, 2018, 1:06pm, mmurphy replied:

That is simple Java I/O, the sort of thing that you would learn from a Java book. It reads bytes from an InputStream and writes them to an OutputStream.

Beyond that, I do not really know how to answer your question.