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

问题：在java线程中使用局部变量时候经常编译器会提示：Cannot refer to the non-final local variable a defined in an enclosing scope（局部变量必须声明为final） 由于方法中的形参i没有声明为final，编译抛出异常：Cannot refer to the non-final local variable a defin

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