在Java和C#多维数组 [英] Multidimensional arrays in Java and C#
问题描述
在C#中有2种方式来创建mutlidimensional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];
我知道第一方法创建一个1维阵列内部,而第二种方法产生数组的数组(较慢访问)。
I know that the first method creates a 1-dimensional array internally, and that the second method creates an array of arrays (slower access).
但在Java中,没有这样的东西[,],我看到声明如下多维数组:
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,Java没有 INT [,]
,我不知道这是否是equivilant到数组1
?或者是它仍然数组的数组?
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
您是不正确的;锯齿(嵌套)阵列的速度更快。 (CLR的是对他们进行了优化)
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;这是一个交错的数组。结果
在Java的语法自动创建所有内部阵列;在C#中,这将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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