Benefits to reuse preexisting exceptions
It makes your API easier to learn and use.Programs using your API are easier to read.Fewer exception classes mean a smaller memory footprint and less time spent loading classes.Common Exceptions
Exception
Occasion for Use
IllegalArgumentException
Non-null parameter value is inappropriate
IllegalStateException
Object state is inappropriate for method invocation
NullPointerException
Parameter value is null where prohibited
IndexOutOfBoundsException
Index parameter value is out of range
ConcurrentModificationException
Concurrent modification of an object has been detected where it is prohibited
UnsupportedOperationException
Object does not support method
Principle
Reuse must be based on semantics, not just on name.Also, feel free to subclass an existing exception if you want to add a bit more failure-capture information (Item 63).
转载于:https://www.cnblogs.com/haokaibo/p/favor-the-use-of-standard-exceptions.html
