Java Programming

Hi,

I am working on an GIS project using Oracle database which stores the spatial data. When I read the polygon points data which is saved as BLOB type in database table and convert the BLOB to byte[], there is no problem. However when the data is converted to Character, those characters are not recognized something like this:
�����������?�����?���w�����������������!����?o����s��8��n�����H��?
������������������ �?&�?�����|��?��������?���������������L�?


This is the method I used to convert BLOB to String below:
-----mapb is the BLOB instance.

byte[] images = mapb.getBytes(1,(int)mapb.length());
String newstring = new String(images);

Is that decoding problem?
Can somebody help me for this problem?

Thanks in advance!

XR