1. Concept
Create an array with array as the data type, which is an array within an array. The elements of multidimensional arrays are arrays, and they can have two-dimensional, three-dimensional, or even more-dimensional arrays.
2. Declaration
数据类型[][] 数组名称; 数据类型[] 数组名称[]; 数据类型数组名称[][];
The functions of the above three syntaxes are equivalent when declaring two-dimensional arrays. In the same way, three pairs of square brackets are required when declaring a three-dimensional array. The brackets can be placed after the data type or after the array name, and so on.
3. Initialize two types Method
(1) Static initialization
int a[][] = new int[][]{{1,2,3},{1,2},{3}};
(2) Dynamic initialization
①String[][] names = new String[2][1]; ②String[][] names = new String[4][];
At the same time You also need to specify how many columns there are in each row.
names[0] = new String[3]; names[1] = new String[3]; names[2] = new String[2]; names[3] = new String[1];
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