Exception Handling

• Exception Handling is used to handle run time errors.
• There are three block in exception handling mechanism.

                            1.try

                            2.catch

                            3.finally

try block:

• The code which may raise exceptions should be written inside the try block.

catch block:

• If the error is raised in try block, the catch block will catch that error and handle that error.
• If the try block will not raise any exceptions, catch block will not be executed.

finally block:

• The try block is used to clean up the resources, what we have opened for operations in the try block. (The resources may be files or database connections, etc..)
• The try block will always executed if the try block exist, except the System.exit(0) call.
• The finally block will executed, even if the error is not raised in try block.

Important Methods of Throwable class are:

• getMessage(); //gives the error description
• printStackTrace(); // gives the error path
• getCause(); // cause is nested error object ==> Throwable t=e.getCause(); t1.printStackTrace();

Note: Throwable class is the base class for Exception class.