是否有任何原因Eclipse在while循环中显示赋值变量有效？ [英] Is there any reason for Eclipse showing assignment variables in while loops as valid?

问题描述

 而我在eclipse中工作Java时遇到了许多次， （recsFinished = true）
  

实际上我想要

  while（recsFinished == true）
  

一个很简单的错误，但它发生在我身上，它完全抛弃了程序。它的原因是因为Eclipse在写入赋值而不是等式方程时甚至不会发出警告。这使我相信存在一个存在赋值方程的while循环的原因，但是为什么？我不能想到一个用途！

解决方案

这样的作业在C和C ++中很受欢迎（特别是在 if statments），并发现自己也是Java的一部分。

一些民间人将文字放在左边： while（true == recsFinished）而是我试图建议你采用这种编程风格，只是我个人觉得它混淆。如果意外使用 = ，则会发出编译器错误。

请注意虽然与 true 的比较是多余的。完全删除它，并使用 while（recsFinished）。

I've been punked numerous times while working on Java in eclipse when I write a while loop like so:

while (recsFinished = true)

When in reality I wanted

while (recsFinished == true)

It's a pretty simple mistake, but it happens to me a lot and it totally throws off the program. And the reason it does is because Eclipse doesn't even throw up a warning when I write the assignment as opposed to the equality equation. This leads me to believe there has to be some reason for a while loop with an assignment equation to exist, but why? I can't think of a single use!

解决方案

Such assignments are popular in C and C++ (particularly within if statments) and have found themselves part of Java too.

Some folk put the literal on the left hand side: while (true == recsFinished) instead and I'm tempted to suggest that you adopt this programming style only that I personally find it obfuscating. This will issue a compiler error if = is used by accident.

Note well though that comparison to true is redundant. Drop it entirely and use while (recsFinished) instead.

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