java有钳位功能吗？ [英] Does java have a clamp function?

问题描述

假设我有一个值，我通常会将其钳制到一个范围，这里的范围是 [0..1] 。也就是说，如果它低于范围开始，将其增加到范围开始，它高于范围结束，将其减少到范围结束。

Suppose I have a value, I usually do this to "clamp" it to a range, here the range [0..1]. That is if it is below the range start, increase it to the range start, it above the range end, reduce it to the range end.

clampedValue = Math.max(0, Math.min(1, value));

是否有内置函数用于钳位到范围？

Is there any built in function for clamping to a range?

推荐答案

看了另一个答案中提供的通用钳位方法，值得注意的是，它有boxing/unboxing 考虑为原始类型。

Having looked at the generic clamp method offered up in another answer, it is worth noting that this has boxing/unboxing considerations for primitive types.

public static <T extends Comparable<T>> T clamp(T val, T min, T max) {...}

float clampedValue = clamp(value, 0f, 1f);

这将使用 Float 包装类，导致3个盒子操作，每个参数一个，以及返回类型的1个unbox操作。

This will use the Float wrapper class, resulting in 3 box operations, one for each parameter, and 1 unbox operation for the returned type.

为了避免这种情况，我会坚持长手写或使用你想要的类型的非泛型函数：

To avoid this, I would just stick to writing it long hand or use a non-generic function for the type you want:

public static float clamp(float val, float min, float max) {
    return Math.max(min, Math.min(max, val));
}

然后只需为所需的每种基本类型重载相同的方法。

Then just overload with identical methods for every primitive type you require.

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