報錯-only final is permitted
出現這樣的錯，一般都是在方法中宣告變數時提示，原因是用了public，private，static等修飾詞去修飾方法內部變數，
然而在java類的方法裡宣告變數時，他是隻能用final修飾(only final is permitted)（或者不加修飾）。
除此之外不能用其他的修飾符修飾，包括static也會報同樣的錯誤。
public，private等是宣告作用域的。方法內部定義的變數（只能在方法內部使用），
在裡面宣告作用域無意義，也禁止宣告。但是在方法外面，是可以的。
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