Entering the nth dimension with arrays

We very briefly mentioned that an array can even hold other arrays at each position. And of course, if an array holds lots of arrays that hold lots of some other type, how do we access the values in the contained arrays? And why would we ever need this anyway? Take a look at this next example where multidimensional arrays can be useful.

A multidimensional array mini app

Let's make a really simple multidimensional array example. You can get the working project for this example in the download bundle. It is located at Chapter 13/Multidimensional Array Example/MainActivity.java.

Create a project with a blank Activity and call it Multidimensional Array Example.

After the call to setContentView in onCreate, declare and initialize a two-dimensional array like this:

// Random object for generating question numbers
Random randInt = new Random();
// a variable to hold the random value generated
int questionNumber;

// declare and allocate in separate stages for clarity...