compressing a file in to GZIP

import java.io.*;
import java.util.zip.*;

public class CompressingFile {
public static void doCompressFile(String inFileName){
try{
File file = new File(inFileName);
System.out.println(" you are going to gzip the  : " + file + "file");
FileOutputStream fos = new FileOutputStream(file + ".gz");
System.out.println(" Now the name of this gzip file is  : " + file + ".gz" );
GZIPOutputStream gzos = new GZIPOutputStream(fos);
System.out.println(" opening the input stream");
FileInputStream fin = new FileInputStream(file);
BufferedInputStream in = new BufferedInputStream(fin);
System.out.println("Transferring file from" + inFileName + " to " + file + ".gz");
byte[] buffer = new byte[1024];
int i;
while ((i = in.read(buffer)) >= 0){
gzos.write(buffer,0,i);
}
System.out.println(" file is in now gzip format");
in.close();
gzos.close();
}
catch(IOException e){
System.out.println("Exception is" + e);
}
}
public static void main(String args[]){
if(args.length!=1){
System.err.println("Please enter the file name which needs to be compressed ");
}
else{
doCompressFile(args[0]);
}
}
}