Simple array example mini-app

Let's make a simple working array example. You can get the completed code for this example in the downloadable code bundle. It's in Chapter 12/Simple Array Example/MainActivity.java.

Create a project with an empty Activity. Call the project Simple Array Example. Leave the Activity with the default name of MainActivity. It doesn't really matter because we won't be returning to this project.

First, we declare our array, allocate five spaces and initialize values to each of the elements. Then we output each of the values to the logcat window. Add this code to the onCreate method just after the call to super.onCreate().

// Declaring an array
int[] ourArray;

// Allocate memory for a maximum size of 5 elements
ourArray = new int[5];

// Initialize ourArray with values
// The values are arbitrary, but they must be type int
// The indexes are not arbitrary. 0 through 4 or crash!

ourArray[0] = 25;
ourArray[1] = 50;
ourArray[2] = 125;
ourArray[3] = 68;
ourArray[4] = 47...