了解三维数组 [英] Understanding Three-Dimensional Arrays

问题描述

我正在尝试把头包裹在三维阵列上.我知道它们是二维数组的数组，但是我正在阅读的书中有些内容让我感到困惑.

I'm trying to wrap my head around three-dimensional arrays. I understand that they are arrays of two-dimensional arrays, but the book I'm reading said something that confuses me.

在我正在阅读的书的练习中，它要求我为全彩色图像制作三维阵列.它给出了一个小例子，说明了这一点:

In an exercise for the book I'm reading, it asks me to make a three-dimensional array for a full-color image. It gives a small example saying this:

如果我们决定选择三维数组，则可以这样声明数组:

If we decide to choose a three-dimensional array, here's how the array might be declared:

int[][][] colorImage = new int[numRows][numColumns][3];

但是，这样会不会更有效?

However, wouldn't it be more effective like this?

int[][][] colorImage = new int[3][numRows][numColumns];

其中3是rgb值，0是红色，1是绿色，2是蓝色.对于后者，每个二维数组将存储行和列的颜色值，对吗?我只想确保我了解如何有效地使用三维数组.

Where 3 is the rgb values, 0 being red, 1 being green, and 2 being blue. With the latter, each two-dimensional array would be storing the color value of the row and column, right? I just want to make sure I understand how to effectively use a three-dimensional array.

非常感谢您的帮助.

推荐答案

顺序无关紧要，实际上前一种形式更易于阅读:

Order doesn't matter, and in fact the former form is more readable:

final const int RED = 0;
final const int GREEN = 1;
final const int BLUE = 2;

int[][][] colorImage = new int[numRows][numColumns][3];
//...

int x = getSomeX();
int y = getSomeY();

int redComponent = colorImage[x][y][RED];
int greenComponent = colorImage[x][y][GREEN];
int blueComponent = colorImage[x][y][BLUE];

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