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Unzip a file with GZIPInputStream

import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.GZIPInputStream; public class Main {   public static void main(String[] args) throws Exception {     int sChunk = 8192;     String zipname = "a.txt.gz";     String source = "a.txt";     FileInputStream in = new FileInputStream(zipname);     GZIPInputStream zipin = new GZIPInputStream(in);     byte[] buffer = new byte[sChunk];     FileOutputStream out = new FileOutputStream(source);     int length;     while ((length = zipin.read(buffer, 0, sChunk)) != -1)       out.write(buffer, 0, length);     out.close();     zipin.close();   } }