My java--Array (2)--multidimensional array

There are several ways to allocate memory space for a high-dimensional array

(1) Allocate space directly for each dimension array

int a[][]=new int [2][3];

(2) Allocate space for each dimension starting from the highest dimension

int a[][]=new int[2][];

a[0]=new int [3];

a[1]=new int [3];

Array of non-regular matrices

Multidimensional arrays in Java are actually both array elements and arrays so the number of elements in each array can be different so that an array of irregular matrices is called a jagged array.

Int[][]a=new int[4][];

a[0]=new int [2];

A[1]=new Int[3];

a[2]=new int [1];

a[3]=new int [9];

Note: It is illegal to write this: int t1[][]=new int [][4];

My java--Array (2)--multidimensional array