A finally clause will execute always wheather the try block
throw any exception or not.

Finally clause is used to handle an exception that is not 
caught by any of the previous catch statements.Finally 
block can be used to handle any exception generated within 
a try block.It may be added immediately after the try block 
or after the last catch block.When a finally block is 
defined,this is guranteed to execute,regardless of whether 
or not an exception is thrown.used in house-keeping 
operations like closing files and releasing system 
resources.

This is a block which provide gurantee about the particular 
code execution, whether there is exception or not.