Java Exceptions are divided into 2 categories:

  1. RuntimeException (also known as unchecked Exception)
  2. Checked Exception

Checked exception

  1. mandatory to try… catch…
  2. otherwise: compile error

eg. ClassNotFoundException, IOException, SQLException and ParseException

Unchecked exception

same as RuntimeException.

eg. NullPointerException, ArrayIndexOutOfBoundException, IllegalArgumentException