CSE110 Lecture 30

Principles of Programming with Java
Multidimensional Arrays
(201705)

Transcript

1. CSE110 Principles of Programming with Java Lecture 32: Multidimensional Arrays Javier Gonzalez-Sanchez javiergs@asu.edu javiergs.engineering.asu.edu Office Hours: By appointment
2. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 2 One-dimensional Array • A two-dimensional array can be thought of as a table of elements, with rows and columns 0 1 2 3 4 5 int [][]array = new int [6][3] array 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2
3. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 3 Reality (2D Array)
4. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 4 Example 2 0 1 2 3 scores 3 4 5 2 4 3 3 5 4 1 1 1 0 1 2 ... // y, x
5. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 5 Multidimensional Arrays • An array can have many dimensions – if it has more than one dimension, it is called a multidimensional array • Each dimension subdivides the previous one into the specified number of elements • Each dimension has its own length constant • Because each dimension is an array of array references, the arrays within one dimension can be of different lengths
6. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 6 int [][][] FourByThreeByTwo = { { {1,2}, {2,4}, //z, y, x {3,6} }, { {2,4}, {4,8}, {6,12} }, { {3,6}, {6,12}, {9,18} }, { {4,8}, {8,16}, {12,24} } }; 12 24 8 16 4 8 9 18 6 12 3 6 6 12 4 8 2 4 3D Array 3 6 2 4 1 2
7. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 7 Test Yourselves
8. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 8 Test Yourselves
9. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 9 Reference Section 6.7 page 282
10. CSE110 - Principles of Programming Javier Gonzalez-Sanchez javiergs@asu.edu Summer 2017 Disclaimer. These slides can only be used as study material for the class CSE110 at ASU. They cannot be distributed or used for another purpose.