Entering the nth dimension with arrays

We very briefly mentioned that an array can even hold other arrays at each position. But 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? Look at this next example of where multidimensional arrays can be useful.

Multidimensional array mini-app

Let's make a simple multidimensional array example. You can get the working project for this example in the download bundle. It is in Chapter 15/Multidimensional Array Example/MainActivity.java.

Create a project using the Empty Activity template and call it Multidimensional Array Example.

After the call to setContentView in onCreate, add the following code, including declaring and initializing a two-dimensional array (highlighted):

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