是否有布尔值的赋值后运算符？ [英] Is there a post-assignment operator for a boolean?

问题描述

在Java中你可以这样吗？

Hi is something like this possible in Java?

boolean flag = true;
if(flag) return flag = false; // return true and assign false to flag afterwards

澄清。以上作品，但首先是假的。我希望实现的是在 true 后立即返回标志，然后将其重置为 false 。

To clarify. The above works, but is assigns false first. Want I want to achieve is to return the flag as soon as its true and reset it to false afterwards.

结构如下所示：

boolean flag = false;
// some operations which can set the flag true
if(flag){ flag = false ; return true};
// some operations which can set the flag true
if(flag){ flag = false ; return true};
// some operations which can set the flag true
if(flag){ flag = false ; return true};

我一直在考虑通过一次性做到这一点返回flag = false ;

推荐答案

不，没有任何内置可以完成您所描述的内容。你可以使用一个临时变量：

No, there's nothing built-in that does what you describe. You'd do it with a temporary variable:

boolean flag = true;
boolean returnValue = flag;
flag = false;
return returnValue;

或根据进一步编辑问题（结构看起来像这个），你可以使用！：

Or based on your further edit to the question ("The structure looks something like this"), you can use !:

boolean flag = false;
// some operations which can set the flag true
if(flag) return !(flag = false);
// some operations which can set the flag true
if(flag) return !(flag = false);
// some operations which can set the flag true
if(flag) return !(flag = false);

我真的，真的不会那么做。这是不必要的迟钝。

I really, really would not do that. It's unnecessarily obtuse.

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