Excption与Error包结构.非检查异常你遇到过哪些情况,检查异常你遇到过哪些情况.

Exception:RunTimeException(`NullPointerException`,`ArrayIndexOutOfBoundsException`)
          checkedException(`FileNotFoundException`,`SQLException`)
Error:StackOverflowError,OutOfMeMoryError
Previoustry catch finally,try里有return,finally还执行么?NextJava面向对象的三个特征与含义.以及面向对象的五个原则

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