CSIS 110 – Lecture 28
Reminders
Program due Friday. Any questions about the current programming assignment?
Quiz: Wednesday, March 29
More Nested For Loops
Let's do one more triangle that is a bit more complicated - Try to write method that prints
triangles like this:
*
***
*****
*******
Multi-dimensional arrays
We have looked at one-dimensional arrays. Java also has multidimensional arrays.
int[] quizScores = new int[20];
ChessPiece[][] chessboard = new ChessPiece[8][8];
double [][][] temperature = new double[500][500][100];
We're going to look at 2-dimensional arrays. They are the most commonly used type of
multi-dimensional array.
A typical way of thinking about 2D arrays is as a set of rows and columns. The
chessboard example has 8 rows and 8 columns. Other examples
String[][] words = new String[10][4];
double[][] measurements = new double[3][5];
First dimension is the number of rows, second dimension is number of columns.
Can anyone think of other 2-dimensional items that we could model using a 2D array?
- gameboards
- spreadsheet
- map coordinates
- matrices
- computer displays
- photographs/images
Accessing the elements
