22: Lecture Arrays in Java
How does Java do arrays?
+ arrays are objects!
+ all elements must have the same type (or class)
+ indicies must be integers or expressions that evaluate to integers
Steps for creating:
+ declare:
type[] name
type name[]
+ assign:
name = new type[size]
+ shortcut version:
type[] name = new type[size]
(more "versions" show up later)
Important notes/features:
+ [] is operator and has highest precedence
+ can declare arrays in same statement but be careful:
ex) int a[], b; -> b NOT is an array
+ why $new$? arrays are objects
+ size is number of elements
+ labeling of indicies starts at zero!
+ if you attempt to access index that does not exist, Java complains
+ can find length automatically with name.length
How to think of objects?
+ arrays "live" in $Object$ class
+ draw a box to r...