Zip the File in Java Program

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("Trsansferring 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);
        }
    }
}