Examples of 2-D Declarations

2-D ARRAYS

String[][] a = new String[3][4];

a[0][0]

a[0][1]

a[0][2]

a[0][3]

a[1][0]

a[1][1]

a[1][2]

a[1][3]

a[2][0]

a[2][1]

a[2][2]

a[2][3]

Each block represents a String variable

Each row represents an array of 4 elements

int[][] nums = {{1, 2, 3, 4}, {2, 11, 16, 3}, {18, 45, 31, 2}, {3, 51, 43, 1}};

This array has 4 rows and 4 columns, and it is made up of integer variables

1

2

3

4

2

11

16

3

18

45

31

2

3

51

43

1

int temp = nums[2][0];

The above declaration will assign the value 18 to the variable temp. 18 is located in the 3rd row (index 2) and first column (index 0) of the matrix