問題研究-Cannot refer to the non-final local variable a defined in an enclosing scope

問題：在java線程中使用局部變量時候經常編譯器會提示：Cannot refer to the non-final local variable a defined in an enclosing scope（局部變量必須聲明爲final） 由於方法中的形參i沒有聲明爲final，編譯拋出異常：Cannot refer to the non-final local variable a defin

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