为什么需要在 switch 语句的最后一个标签之后放置 break?

Why do you need to put break after the last label of a switch statement?(为什么需要在 switch 语句的最后一个标签之后放置 break?)

问题描述

编译器肯定知道它是 switch 语句的最后一个标签吗?

Surely the compiler knows that it's the last label of the switch statement?

推荐答案

在 switch 的最后一个 case 语句之后休息一下是好的 <​​a href="http://en.wikipedia.org/wiki/Defensive_programming" rel="noreferrer">防御性编程.如果将来可能在下面添加另一个 case 语句，它会消除上述案例中程序流程失败的风险.

Having a break after your switch's final case statement is good defensive programming. If, perhaps in the future, another case statement is added below, it removes the risk of the program's flow falling through from the case above.

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