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  • Multidimensional Arrays

Multidimensional Arrays

A multidimensional array is an array of arrays.

Multidimensional arrays are useful when you want to store data as a tabular form, like a table with rows and columns.

To create a two-dimensional array, add each array within its own set of curly braces:

Example

int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

myNumbers is now an array with two arrays as its elements.

Access Elements

To access the elements of the myNumbers array, specify two indexes: one for the array, and one for the element inside that array. This example accesses the third element (2) in the second array (1) of myNumbers:

Example

int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

System.out.println(myNumbers[1][2]); // Outputs 7

Remember that: Array indexes start with 0: [0] is the first element. [1] is the second element, etc.

Change Element Values

You can also change the value of an element:

Example

int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

myNumbers[1][2] = 9;

System.out.println(myNumbers[1][2]); // Outputs 9 instead of 7

Loop Through a Multi-Dimensional Array

We can also use a for loop inside another for loop to get the elements of a two-dimensional array (we still have to point to the two indexes):

Example

public class Main {

  public static void main(String[] args) {

    int[][] myNumbers = { {1, 2, 3, 4}, {5, 6, 7} };

    for (int i = 0; i < myNumbers.length; ++i) {

      for(int j = 0; j < myNumbers[i].

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