哪个在2D数组，行或列中首先出现？ [英] Which comes first in a 2D array, rows or columns?

问题描述

创建2D数组时，如何记住是先指定行还是列？

When creating a 2D array, how does one remember whether rows or columns are specified first?

推荐答案

Java被认为是 row major，意思是它先行。这是因为2D数组是数组数组。

Java is considered "row major", meaning that it does rows first. This is because a 2D array is an "array of arrays".

例如：

int[ ][ ] a = new int[2][4];  // Two rows and four columns.

a[0][0] a[0][1] a[0][2] a[0][3]

a[1][0] a[1][1] a[1][2] a[1][3]

It也可以更像这样显示：

It can also be visualized more like this:

a[0] ->  [0] [1] [2] [3]
a[1] ->  [0] [1] [2] [3]

第二个插图显示数组数组方面。第一个数组包含 {a [0]和[1]} ，每个数组都包含四个元素， {[0] [1] [2] [3]} 。

The second illustration shows the "array of arrays" aspect. The first array contains {a[0] and a[1]}, and each of those is an array containing four elements, {[0][1][2][3]}.

TL; DR摘要：

Array[number of arrays][how many elements in each of those arrays]

有关更多说明，另请参阅 数组 - 2 -dimensional 。

For more explanations, see also Arrays - 2-dimensional.

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