@SuppressWarnings有什么用？

问题描述

我不明白Java的这个特性。我知道它使编码更容易，有时看起来更整洁，但实际使用的是什么？相反，我觉得，最好显示警告，因为将来任何人都可以在修改代码之前引用它们。这个@SuppressWarnings是否会提高压缩效率，还是根据任何编码标准？

I didn't understand this feature of Java. I know it makes coding easier and sometimes looks neater, but what is the actual use of this? On contrary i feel, its better to display the warnings, as in future any one can refer them before making modifications to code. Does this @SuppressWarnings increases compliling efficiency OR is this according to any coding standards?

推荐答案

其他答案已经解释了 @SuppressWarnings 的用例，但是我想强调一点，有时你绝对需要使用 @SuppressWarnings 来克服语言本身的限制，并且在这些情况下使用 @SuppressWarnings 绝对合法。

Other answers already explained use cases of @SuppressWarnings a lot, but I want to emphasize the point that sometimes you absolutely need to use @SuppressWarnings to overcome limitations of the language itself, and in these cases use of @SuppressWarnings is absolutely legal.

在其他情况下，使用 @SuppressWarnings 可能会被认为是有问题的，因为在这些情况下你可以随时摆脱通过更改代码发出警告（但显然，它并不总是可以接受）。

In other cases use of @SuppressWarnings can be considered questionable, because in these cases you can always get rid of warnings by changing the code (though, obviously, it's not always acceptable).

以下是一些常见情况，如果没有 @SuppressWarnings ：

Here are some common cases when you absolutely cannot get rid of warnings without @SuppressWarnings:

• 实现支持数组的通用集合（因为您无法创建通用数组）


• 一个 Map 从类到它们的实现（因为你不能将泛型类型参数的不同值分配给不同的地图）

• Implementing an array-backed generic collection (since you cannot create a generic array)
• A Map from classes to their implementations (since you cannot assign different values of generic type parameter to different map entires)

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