java exception

classDiagram
    Object <|-- Throwable
	Throwable <|-- Error
    Throwable <|-- Exception
	Exception <|-- SQLException
	Exception <|-- IOException
	Exception <|-- RuntimeException
	RuntimeException <|-- ArithmeticException
	RuntimeException <|-- IndexOutOfBoundsException
	RuntimeException <|-- IllegalArgumentException
	RuntimeException <|-- NullPointerException
	IndexOutOfBoundsException <|-- ArrayIndexOutOfBoundsException
	IllegalArgumentException <|-- NumberFormatException
	<<JavaClass>> Object
	<<JavaClass>> Throwable
	<<JavaClass>> Error
	<<JavaClass>> Exception
	<<JavaClass>> SQLException
	<<JavaClass>> IOException
	<<JavaClass>> RuntimeException
	<<JavaClass>> ArithmeticException
	<<JavaClass>> IndexOutOfBoundsException
	<<JavaClass>> IllegalArgumentException
	<<JavaClass>> NullPointerException
	<<JavaClass>> ArrayIndexOutOfBoundsException
	<<JavaClass>> NumberFormatException

checked Exception	Unchecked Exception
반드시 예외를 처리해야함	명시적인 처리를 강제하지 않음
컴파일 단계	실행단계
예외발생시 트랜잭션 roll-back	roll-back 하지 않음
IoException, SQLException	NullPointerException, llegalArgumentException