异常处理
No enclosing instance of type a12_1 is accessible. Must qualify the allocation with an enclosing instance of type a12_1 (e.g. x.new A() where x is an instance of a12_1).No enclosing instance of type a12_1 is a
阅读背景：
JAVA异常处理 No enclosing instance of type a12_1 is accessible. Must qualify the allocation with
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