ArrayLists

An ArrayList is like a regular Java array on steroids. It overcomes some of the shortfalls of arrays, such as having to predetermine its size. It adds a number of useful methods to make its data easy to manage, and it uses an enhanced version of a for loop, which is clearer to use than a regular for loop.

Let's look at some code that uses ArrayList:

// Declare a new ArrayList called myList to hold int variables
ArrayList<int> myList;
 
// Initialize the myList ready for use
myList = new ArrayList<int>();

In the previous code, we declared and initialized a new ArrayList called myList. We can also do this in a single step, as demonstrated by the following code:

ArrayList<int> myList = new ArrayList<int>();

Nothing especially interesting so far, so let's take a look at what we can actually do with ArrayList. Let's use a String ArrayList this time:

// declare and initialize a new ArrayList
ArrayList<String> myList = new ArrayList<String&gt...