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Could any one clarify the difference between RuntimeException and Exception? In my opinion, every exception must happen at run time, and therefore, I think we only need RuntimeException. There is no need for Exception.

So, in your opinion，the difference between Exception and RuntimeException is that Exception is meant to happen not at runtime.

This is just my understanding.
RuntimeException is there to specify normal exceptions.
Exception is there to handle bigger scope, with all types of exception.