The lengths of the rows in a two-dimensional array are not required to be the same.

The elements of a multidimensional array are initialized when the array object is created.

A multidimensional array with the same number of columns in every row can be created with an array-creation expression, such as        int[ ][ ] mwee =  new int [2] [5];

calm[0] =  new int [3]; // a multidimensional array named calm is created with row 0 having 3 //columns

A multidimensional array in which each row has a different number of columns can be created as follows: int[ ][ ] jet =  new int [5] [8];

int[ ][ ] mwee =  new int [2][ ]; // a multidimensional array named mwee is created with 2 //rows in which each row has a different number  of columns

yee[2] =  new int [9]; // a multidimensional array named yee is created with row 2 having 9 //columns

When an array is created, each element of the array will receive a default value.

When an array for the numeric primitive-type element is created, each element will receive a default value of zero.

An array-creation expression and declaration for an array of five integer elements and named mwee can be  int[ ] mwee = new int[5];

When an array for the boolean-type of element is created, each element will receive a default value of true.

When an array for the reference-type of element is created, each element will receive a default value of null.

Array objects are created with the keyword new.