Exceptions

Checked Exceptions

Unchecked Exceptions

Handling

Catching

• ``

  • Used to specify a block of code which can throw an exception.
  • Must be followed by a ``.
  • Can't be used alone

• ``

  • Block used to handle the error.
  • Must be preceded by ``
  • Can't be used alone

Always execute

• ``

Contains the code which must be executed irrespective of whether an exception is handled or not

Throwing

• ``

Used to throw an exception

Declaring

• ``
  • Used to declare exceptions
  • Doesn't throw error
  • Specifies that an exception may occur in a method
  • Used with method signature

Creating Custom Exceptions

• How to create?

• How to return your custom message while throwing exception?

• Are custom exceptions checked or unchecked?

Propagation

Exceptions in main() method

• What happens when main() throws an error?

• Can throws keyword be used with main()?

Exceptions raised in common scenarios