簡單賦值運算符和複合賦值運算符

java 中的=爲簡單賦值運算符，java += -= 等爲複合賦值運算符面試   看java specification中的一句話express   A compound assignment expression of the form E1 op= E2 is equivalent to E1 = (T)((E1) op (E2)), where T is the type of E1, e

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