ArrayList is a resizable-array implementation of the List interface.

Traversing arrays

Traversing an array is the process of visiting each element of an array.

Two common ways to traverse an array are:

• simple for loop / while loop

• for-each loop

Example array

int[] myArray = {1,2,3,4,5}

Arrays are data structures that hold a group of elements and each element has a position denoted by an integer called the index of that element.  

Important properties of arrays

Important properties of arrays are:

1. Array indexes (element positions) have to be integers and start at 0. 

Multidimensional arrays are arrays of arrays. For instance, a 2D array is an array of 1D arrays and a 3 D array is an array of 2 D arrays, where each of those 2D arrays is again an array of 1D arrays.

Multidimensional array declaration and initializations

Declaration without initialization

int mArray[][];  or

int mArray1[][][]; or

int [] mArray2[][];