Exception Handling
					  ---------------------
Q)What are the different kinds of errors that are encountered during the development
and execution of Java applications?
        1)Compilation errors
	2)Runtime errors
	3)Logical errors
 =>Java Compiler reports compilation errors when the syntax of of the source code
 is not correct.
 =>When Java runtime environment rules are voilated JVM reports thos errors
 known as runtime errors.
           For eg. trying to open a non-extising file

=>If the application is giving unexpected/wrong result, we say that there are some
logical errors in it. Neither Java compiler reports them nor JVM reports them. Applicatio
logic is wrong.

Q)What is an exception?
=>An abnormal event occured during the execution of a Java application which disrupts
the normal flow of the application is nothing but an execption.

=>Runtime error is nothing but an exception.

=>In Java, an exception is also an object.

=>When Java runtime environment rules are violated, JVM raised error is an exception.
             
Q)What are the dangers caused by an exception?
 =>When an exception is raised application is terminated abnormally.
 =>Abnormal termination of the application causes the following dangers.
          1)user's data/work may be lost
	  2)user doesn't have information about what went wrong
	  3)resources given to the application can't be gracefuly released.

Q)What is exception handling?
=>Exception handling is a mechanism of dealing with exceptions and there by
 preventing the dangers caused by the exceptions.
 
 =>Exception handling  makes Java applications robust.

 Note:- Ability to  withstand against failure is nothing but robustness.

Q)How does Java support implement exception handling in Java Applications?
         1)Language support
	 2)API support(Library support)
=>As far as Java languge support for exception handling is concerned,
Java has given 5 keywords.
    1)try
    2)catch
    3)throw
    4)throws
    5)finally
=>As far as API support is concerned, a hierachy of pre-defined exception
classes is given.