java - Long.reverse(long) 方法有什么用？

Question

我在Long类中找到了一个方法

public static long reverse(long i) {..}

这个方法有什么用？

Answer 1

来自 DDJ article :

Why would you reverse the order of bits in a 32-bit or 64-bit value? Bit reversal can be useful in a variety of contexts. It's useful in image processing for flipping a black-and-white image to create a mirror image. To flip an image horizontally, the pixels in a row of the image must be placed in reverse order. Fast 64-bit bit reversal can be used in the process of reversing a row of black-and-white pixels. Similarly, 64-bit bit reversal is useful for rotating a black and white image 180 degrees.