constant expression

基本解释

We cannot use an constant expression "that designes the adress… ", but could we use a converted constant expression?
我們不能用一個常量表達式，設計了地址……”，但我們可以使用轉換常數表達式？
If the expression can be verified as a constant, then a constant expression (which is available for optimization) is used.
如果發現表達式是常量，那麽就使用可以優化的常量表達式。
Extract Constant is similar to Extract Local Variable, but you must select a static, constant expression, which the refactoring will convert to a static final constant.
Extract Constant 與 Extract Local Variable 相似，但是您必須選擇靜態常量表達式，重搆工具將會把它轉換成靜態的 final 常量。

And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.
也會遇到它,在這裡，你可以就把它,理解爲一個轉換系數,我們需要做的。
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