Java 和 C# 中的多维数组 [英] Multidimensional arrays in Java and C#

问题描述

在 C# 中有两种方法可以创建多维数组.

In C# there are 2 ways to create mutlidimensional arrays.

int[,] array1 = new int[32,32];

int[][] array2 = new int[32][];
for(int i=0;i<32;i++) array2[i] = new int[32];

我知道第一种方法在内部创建一个一维数组，第二种方法创建一个数组数组(访问速度较慢).

I know that the first method creates a 1-dimensional array internally, and that the second method creates an array of arrays (slower access).

但是在Java中，没有[,]这样的东西，我看到多维数组是这样声明的:

However in Java, there is no such thing as [,], and I see multidimensional arrays declared like this:

int[][] array3 = new int[32][32];

由于这种语法在 C# 中是非法的，而 Java 没有 int[,]，我想知道这是否与 array1 等效?还是还是数组数组?

Since such syntax is illegal in C#, and Java has no int[,], I'm wondering if this is equivilant to array1? Or is it still an array of arrays?

推荐答案

你错了；锯齿状(嵌套)数组更快.(CLR 已针对它们进行了优化)

You are incorrect; jagged (nested) arrays are faster. (the CLR is optimized for them)

Java 不支持真正的多维数组；这是一个锯齿状的数组.
Java 语法自动创建所有内部数组；在 C# 中，这需要一个单独的循环.

Java does not support true multi-dimensional arrays; that's a jagged array.
The Java syntax automatically creates all of the inner arrays; in C#, that would need a separate loop.

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