Correct unzipping with Java

GZipTest.java

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;

public class GZipTest {

    public static void main(String[] args) throws IOException {

        /**
         * GZIPInputStream has internal buffer for reading the underlying
         * InputStream's bytes (512 bytes by default, now 8192), but it
         * doesn't buffer the inflation of the bytes. This is not a problem
         * when you use the read(byte[] bytes) but when you use the read()
         * method frequently you may be in trouble without buffering the
         * GZIPInputStream itself.
         *
         * Don't try running this without the BufferedInputStream.
         */
        InputStream in =
                new BufferedInputStream(
                new GZIPInputStream(
                new FileInputStream("/path/to/bigbinary.tar.gz"), 8192));

        long start = System.currentTimeMillis();
        System.out.print("Started reading... ");

        while (in.read() != -1) {
        }

        long end = System.currentTimeMillis();
        System.out.println("ended. Took: " + (end - start) + " ms");

        in.close();
    }
}