1) Separating normal code from exception handling code to avoid abnormal termination of program.
2) Categorizing in to different types of Exceptions so that rather than handling all exceptions with
Exception root class we can handle with specific exceptions. It is recommended to handle exceptions with
specific Exception instead of handling with Exception root class.
3) Call stack mechanism : If a method throws an exception and it is not handled immediately, then that
exception is propagated or thrown to the caller of that method. This propogation continues till it finds an
appropriate exception handler ,if it finds handler it would be handled otherwise program terminates
abruptly