What is Exception handling in java

In java exception is an object. Exceptions are created when an abnormal 
situations are arised in our program. Exceptions can be created by JVM or 
by our application code. All Exception classes are defined in java.lang. 
In otherwords we can say Exception as run time error.

An exception is an event, which occurs during the execution of a 
program, that disrupts the normal flow of the program's instructions.

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.

Exception handling is a mechanism what to do when some abnormal situation 
arises in program.  When an exception is raised in program it leads to 
termination of program  when it is not handled properly. The significance of 
exception handling comes here in order not to terminate a program abruptly 
and to continue with the rest of program normally. This can be done with help 
of Exception handling.