Java / Scala中的非短路逻辑（布尔）运算符有很好的用途吗？

问题描述

我最近发现Java（和Scala）包含非短路逻辑运算符& ， | ，和 ^ 。我以前认为这些只能作为按位运算符。虽然可能存在 ^ 的争论，但我想不出使用非短路逻辑运算符的非常好的理由 - 虽然可以肯定，我可以设想一个例子。

I recently discovered that Java (and Scala) include non-short-circuiting logical operators &, |, and ^. I previously thought these only worked as bitwise operators. While maybe there is an argument for ^, I can't think of very good reasons for using non-short-circuiting logical operators--although sure, I can contrive an example.

这些运营商有用吗？它们似乎更容易导致难以捕获的错误。

Are these operators useful? They seem more likely to cause hard-to-catch bugs.

scala> def foo = {
     |   println("foo")
     |   true
     | }
foo: Boolean

scala> def bar = {
     |   println("bar")
     |   true
     | }
bar: Boolean

scala> foo || bar
foo
res5: Boolean = true

scala> foo | bar
foo
bar
res6: Boolean = true

推荐答案

如果右侧是您想要执行的副作用的函数（例如日志记录），它们将非常有用。但是，我会建议这有点代码味道，对下一个人来说肯定是不直观的。

They're useful if the right-hand side is a function with side-effects that you want to execute regardless (e.g. logging). However, I would suggest that that's a bit of a code smell and will certainly be unintuitive to the next guy.

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