how to check for error or an exception in java code example

Example 1: what is exception 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.

Example 2: what is exception in java

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

Example 3: how to handle exceptions

I use try & catch & finally block
to handle exception if I will use the method
in different class.

Or If I will use it only once and if it is checked
exception then I use THROWS keyword on method signature