How to convert file formats?

From: unni (unni.upasana_at_gmail.com)
Date: 03/30/05 

Date: 30 Mar 2005 05:27:15 -0800

Hello,

        I want to convert a GCF file format to SEGY and SAC formats
and viceversa.How can compare these formats in java?

               Thanking you
                                                       Faithfully
                                                          Unnikrishnan