CS 110 Arrays II – Multi-dimensional Arrays 1
Copyright C. Tanner 2009
• Organize information in a way that solves more complex problems than can be
done with a linear or one dimensional array
• 2-dimensioanl array – matrix
o simplest
o Table
o All elements must be of the same data type
o Fixed size
• Examples
o Classroom seating chart 6 desk in a row with 5 rows
X X X X X X
X X X X X X
X X X X X X
X X X X X X
X X X X X X
String [] [] desk = new String [5][6]
o Employee Time time
Emp Mon Tues Wed Thurs Fri Sat Sun
double [] [] timeCard= new double [30][7]
o Girl Scout Cookie Orders
Customer ThinMints DoSiDoes Treffoils
• int [] [] cookieOrders = new int [#customers][3]
• Reference a element
• Need both row and column index
• matrix[r][c]
• desk [0][5] – the student’s name in the first row door seat
• cookieOrder[3][0] – the number of ThinMints customer 3 ordered
custTotal =0
for (int i = 0; i <3; i++)
custTotal = cookieOrder[3][i];
