1. Announcements & review
Last Time
Manipulating 2D arrays of base types
int[][] board = new int[3][3]
Today
More on 2D arrays
Finish TicTacToe
No Announcements!?
Lecture 22: 2 Dimensional Arrays

2. Lecture 22: 2 Dimensional Arrays
Array declarations
int[][] blob;
int[][] blob2 = new int[3][5];
int[][] blob3 = new int[4];
for (i=1;i<=blob3.length; i++) {
blob3[i-1] = new int[i]; }
blob -> null
blob2 ->
after declaration
blob3 ->
after loop blob3 ->
-> null
-> null
-> null
-> null
Lecture 22: 2 Dimensional Arrays

3. Lecture 22: 2 Dimensional Arrays
Java Examples in BlueJ
Let’s continue with our tic-tac-toe program
Lecture 22: 2 Dimensional Arrays