An exception is first thrown from the top of the stack and if it is not caught, it drops down the call stack to the previous method, If not caught there, the exception again drops down to the previous method, and so on until they are caught or until they reach the very bottom of the call stack. This is called exception propagation. By default UncheckedExceptions are forwarded in calling chain(propagated).
Let's see a program to understand this concept.
In the above example exception occurs in display() method where it is not handled, so it is propagated to previous show() method where it is not handled, again it is propagated to print() method where exception is handled. Exception can be handled in any method in call stack either in main() method, print() method, show() method or display() method.
By default Checked Exceptions are not forwarded in calling chain(propagated). Let's see a program:
Compile Time Error