How to decompress file from GZIP file using java?

Question:

How to decompress file from GZIP file using java?

Code:

import java.io.*;
import java.util.zip.GZIPInputStream;
 
public class GUnZipFile {
  public static void main( String[] args ) {
 
    String input = "/tmp/file.txt.gz";
    String output = "/tmp/file.txt";
 
    byte[] buffer = new byte[1024];
 
    try {
 
      FileInputStream fis = new FileInputStream(input);
      GZIPInputStream gzis = new GZIPInputStream(fis);
 
      FileOutputStream fos = new FileOutputStream(output);
 
      int len;
      while ((len = gzis.read(buffer)) > 0) {
         fos.write(buffer, 0, len);
      }
 
      gzis.close();
      fos.close();
      System.out.println("Done");
 
    } catch(Exception ex) {
      System.out.println(ex);
    }
  }
}

Output:

$ java GUnZipFile
Done

$ ls -l /tmp/file.txt.gz 
-rw-rw-r-- 1 dennis dennis 56 Feb 26 16:44 /tmp/file.txt.gz

$ ls -l /tmp/file.txt
-rw-rw-r-- 1 dennis dennis 4880 Feb 26 16:52 /tmp/file.txt