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- The class at the top of the exception class hierarchy is the Throwable class, which is a direct subclass of the Object class
- Throwable has two direct subclasses:
+ Exception
+ Error

- The Exception class is used for exception conditions that the application may need to handle. Examples of exceptions include IllegalArgumentException, ClassNotFoundException and NullPointerException.
- The Error class is used to indicate a more serious problem in the architecture and should not be handled in the application code. Examples of errors include InternalError, OutOfMemoryError and AssertionError.
- Exceptions are further subdivided into checked (compile-time) and unchecked (run-time) exceptions. All subclasses of RuntimeException are unchecked exceptions, whereas all subclasses of Exception besides RuntimeException are checked exceptions.