27
March Lecture 27, 2008
ArrayList
ArrayList band = new ArrayList() band.add ("Paul"); Band.add("John"); ... int location = band.indexOf("Paul"); Band.remove(location);
An ArrayList is not declared to store a particular type An Arraylist object dynamically grows and shrinks Any type of object can be stored in it
ArrayList() boolean add(Object obj) void add(int index, Object obj) Object remove(int index) Object set(int index, Object obj) void clear() boolean contains(Object obj) int obj) indexOf(Object Object get(int index) boolean isEmpty() int size()
An ArrayList is a generatic type
Allows us to the type of data The compiler will not allow an object to be added unless it's of this specified type
ArrayList<String> myList = new ArrayList<String>(); ArrayList<Point> myList = new ArrayList<Point>();
Declaring the element type of an ArrayList is usually a good idea:
Type-checking Eliminates the need to cast an object into its true type
In class example ...