Uncompressing the file in the GZIP format

Sometimes it happens that when you download a file or any PDF file you get it in compressed mode. This means that the file is compressed, but can't read it in compressed form so, it needs to be uncompressed. There are various uncompress ion utility program which can be found very easily found on internet. If you are uncompressing a PDF with the extension .gz, then its resultant file will have a .PDF extension. Its main advantage is that it will uncompress the PDF file so that you can be able to read it. This utility is a part of java.util.zip package which provides classes and methods to compress and decompress the file.

import java.util.zip.GZIPInputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class JavaUncompress{
 public static void main(String args[]){
  try{
   //To Uncompress GZip File Contents we need to open the gzip file.....
   if(args.length<=0){
    System.out.println("Please enter the valid file name");
   }
   else{
    String inFilename = args[0];
    System.out.println("Opening the gzip file........

      .................. :  opened");


      GZIPInputStream gzipInputStream = null;
    FileInputStream fileInputStream = null;
    gzipInputStream = new GZIPInputStream(new 

      FileInputStream(inFilename));
    System.out.println("Opening the output file... : opened");
    String outFilename = inFilename +".pdf";
    OutputStream out = new FileOutputStream(outFilename);
    System.out.println("Transferring bytes from the compressed file to the output file........: Transfer successful");
    byte[] buf = new byte[1024];  //size can be changed according to programmer's need.
    int len;
    while ((len = gzipInputStream.read(buf)) > 0) {
     out.write(buf, 0, len);
    }
    System.out.println("The file and stream is ..

      ....closing.......... : closed"); 
      gzipInputStream.close();
    out.close();
   }
  }
  catch(IOException e){
   System.out.println("Exception has been thrown" + e);
  }
 }
}