When an exception occurs, the system searches for the 
nearest catch clause that can handle the exception, as 
determined by the run-time type of the exception. First, 
the current method is searched for a lexically enclosing 
try statement, and the associated catch clauses of the try 
statement are considered in order. If that fails, the 
method that called the current method is searched for a 
lexically enclosing try statement that encloses the point 
of the call to the current method. This search continues 
until a catch clause is found that can handle the current 
exception, by naming an exception class that is of the same 
class, or a base class, of the run-time type of the 
exception being thrown. A catch clause that doesn?t name an 
exception class can handle any exception. Once a matching 
catch clause is found, the system prepares to transfer 
control to the first statement of the catch clause. Before 
execution of the catch clause begins, the system first 
executes, in order, any finally clauses that were 
associated withtry statements more nested that than the one 
that caught the exception. Exceptions that occur during 
destructor execution are worthspecial mention. If an 
exception occurs during destructor execution, and that 
exception is not caught, then the execution of that 
destructor is terminated and the destructor of the base 
class (if any) is called. If there is no base class (as in 
the case of the object type) or if there is no base class 
destructor, then the exception is discarded.