Classes of Exceptions

• There are two subclasses of Throwable

  • Error such as OutOfMemoryError which do NOT have to be caught as they are serious but unpredictable and could typically occur anywhere!
  • Exception which we have discussed

• Exception has a subclass RuntimeException that need NOT be caught

  • Typical RuntimeException subclasses are
    • ArithmeticException, ClassCastException, IndexOutofBoundException

• Note that exceptions which are thrown but not caught appear as error message on stderr. For applets this is in the “Java console” of the browser.

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