AP® Computer Science A glossary

ArrayList

Also called: ArrayList<E>

Course: AP® Computer Science A Shows up in: Unit 4: Data Collections

A java.util class for a list of object references that can grow and shrink; ArrayList<E> names the element type E.

Appears in the course and exam description (CED): 4.8.A.14.8.A.24.8.A.34.8.A.44.8.A.6

The constructor ArrayList() builds an empty list. Indexes run from 0 to size() - 1. Using ArrayList<E> lets the compiler catch type errors that would otherwise appear at run time.

ArrayList<String> songs = new ArrayList<String>();
songs.add("Intro");
songs.add("Finale");
System.out.println(songs + " " + songs.size());

Output:

[Intro, Finale] 2

Related terms

• ArrayList methods
• Array
• Integer (class)
• IndexOutOfBoundsException
• Traversal