Java program codes: Uncompressing Zip file in java

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);
}
}
}