Cannot refer to a non-final variable music inside an inner class defined in a different method
Change modifier of 'music' to final
最近在写程序的时候一直出现这个提示,一直没有时间来查询原因.不解,先把标题留在这儿,有时间了来查看
还有一个是实例化后的对象在赋为 return null时没有为null
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