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Hierarchy of Exception Classes

• Base of hierarchy: Throwable
• Two subclasses: Error, Exception
• Subclasses of Error: fatal
  (out of memory, assertion failure)
• Subclasses of Exception: 
• • Lots of checked exceptions
    (I/O, class not found)
  • RuntimeException--its subclasses are unchecked
    (null pointer, index out of bounds)

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