if v just gve a default exception block,bfre the specific
catch statement it ll create a unreachable code exception
e.g
catch(Exception e)
{System.out.println(unknown exception);}
catch(ArithmeticException e)
{System.out.println("Division by zero");}

Subclass exception handler should come first then the 
superclass has to come next. Then only code wil compile 
otherwise subclass exception will be never reached results 
compilation error.