there is no difference between blank inerface and marker 
interface 
yes we can creae our own marker inerface
interface Xyz
{
}
but is this work for us like a serializable and cloneable 
marker inerface 
i don't know  so please  
you do one thing to do your own interface to check only 
through the insanceof operator in a clsses those implemen 
this interface
thanks                                          amit singh
amitsing2008@gmail.com