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
   

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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
   

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3. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 3
   Reality (2D Array)
   

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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
   

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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
   

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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
   

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7. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 7
   Test Yourselves
   

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8. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 8
   Test Yourselves
   

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9. Javier Gonzalez-Sanchez | CSE110 | Summer 2017 | 9
   Reference
   Section 6.7 page 282
   

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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.
    

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