Accessing
To access the elements of a two-dimensional array, we first tell Java which array we mean.
int[][] arr2d = new int[5][5];
int[] arrayAtIndex0 = arr2d[0];
After telling Java which array, we can use another [] to say which element.
int x = arrayAtIndex0[3];
We are telling Java which row and column we want.
- We can access elements in one statement.
int[][] arr2d = new int[5][5];
int x2 = arr2d[0][3];
Practice Exercise¶
Think of 2-d arrays in terms of "row" and "column", not x and y coordinates.
Assigning Elements¶
Assigning elements is simple - just tell Java which row and column you want.
int[][] arr2d = new int[5][5];
arr2d[3][2] = 42;
Drill¶
AdvancedArrays/com.example.advancedarrays.drills.MultiDeclare
* Fill the multi-dimensional array as directed.