其實原因很簡單，就是翻譯的結果
匿名內部類和局部內部類只能引用外部的fianl變量
把變量變成fianl就行了 第一次知道啊 記小本本。。。。。。。
Eclipse連接數據庫報錯Local variable passwd defined in an enclosing scope must be final or effectively final
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Local variable flag defined in an enclosing scope must be final or effective
Java8在 lambda 表達式中使用局部變量會提示：Local variable flag defined in an enclosing scope must be final or effectively final解決辦法
【java】關於Cannot refer to the non-final local variable list defined in an enclosing scope解決方法
【轉】The final local variable xxx cannot be assigned, since it is defined in an enclosing type
Cannot refer to the non-final local variable user defined in an enclosing scope 內部類定義在方法內，方法定義的參數（形參）無法被內部類直接訪問，需要用final定義
local variables referenced from a Lambda expression must be final or effectively final------理解
Variable used in lambda expression should be final or effectively final
Variable used in lambda expression should be final or effectively final
Variable used in lambda expression should be final or effectively final
python 使用嵌套函數報local variable xxx referenced before assignment或者 local variable XXX defined in enclosing scope