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No enclosing instance of type xx is accessible. Must qualify the allocation with an enclosing instance of type xx (e.g. x.new A() where x is an instance of xx ).
这种情况一般是在调用内部类(未被静态修饰)时出现，两种解决方法：
1、直接Inner in = new Outer().new Inner();
2、加static修饰 ，Inner in = new Inner();
例子：https://stackoverflow.com/questions/7841210/having-a-issue-using-inner-class-java
--> java编程思想： P193