11.3 How to create array lists of objects?

A. Introduction

Arrays are powerful but their sizes are fixed once declared. To overcome the inconvenience, array lists are introduced in Java. Array lists are resizable. See below:

B. Watch (Slides)

C. Try:

Intro Java: E.7.11-E7.14 of Big Java Early Objects

AP CS A: Refer to Card.java and Deck.java code base, finish up the constructor that initializes the deck as an ArrayList. Add a Tester class to create a deck of 52 cards. Ask users to enter 3 numbers between 1-52, remove those cards; then ask users to enter a number between 1-49, print out the suit and face of that card.

D. What is <E>?

<E> is a type parameter to specify what type of objects will the array list has. See ArrayList of Person objects here.