[Answered by Dayve and Andrew Grider] Index explained better please arr[2] = 42;

Question

I do not understand what the Index is that number inside the brackets.

EDIT: So would i be right in assuming this is like a Var the only real difference is that we can keep the Var name for multiple values by using index?

EDIT 2: Ahhhh Andrew that made perfect sense to me it is basically like a bookshilf or a Data base containing under 1 variable multiple assigned values.

Answer 1

/* Starting from the scratch.
Let's declare an Array named arr of type int with a maximum number of elements 10 : */

int arr[] = new int[10]; // Array Declaration
/* Now, we need to add some elements into our arr as it has only the default value 0 at the moment. */

arr[2] = 42;

/* Here, we added 42 to the array index 2 (remember that array index starts from 0) and it becomes the third element of our arr. If we try to print it's value, we get 42 as an output */

System.out.print(arr[2]); // outputs 42

This way, we can put any type of number into an array at any of its index :]

Answer 2

2 represents the index number
it means the 3rd array of arr contains the value 42
array index numbers starts from 0,1,2...