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, which in turn 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 multi-dimensional arrays can be useful.

Multidimensional Array mini app

Let's make a simple multi-dimensional array example. You can get the working project for this example in the download bundle. It can be found in the Chapter 15/Multidimensional Array Example/MainActivity.java folder.

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

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

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

// declare and allocate in...