Description: Exceptoin has a special subclass of RuntimeException exception runtime exceptions. If the contents of this exception is thrown in the function, the function can not declare, as compiled through. If the function is declared on the exception. The caller can not be processed. As compiled through why do not the function declaration, because the caller does not need to deal with. When this exception occurs, you want the program to stop. Because at run time, there has been unable to continue operations, in the hope to stop the program after the code be amended. Custom Exception: If the exception occurs, you can not continue operations, let custom exception inheritance RuntimeException. For the exception of two kinds: one, to be detected at compile time exception. 2, the compiler is not detected abnormality (runtime exception. RuntimeException and its subclasses)
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ExceptionDemo4.java
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