LECTURE NOTES
NOVEMBER 18 2004

ASSIGNMENTS
Read 10.5
11:58 PM CodeLab #11
Mon 11/22 Assignment 4

TWO-DIMENSIONAL ARRAYS

Why?
- common, effect means for communicating information
What?
- table organized in columns
How?
- in Java, 2D array
- array elements can contain anything, including another array

What?
- subarray: an array inside of another array

What?
- 2D arrays in Java
How?
- no explicity 2D array structure
- instead, use the array structure to make an array of arrays

What?
- declare a 2D array
How?
- each element contains an array: <base type>[]
- to declare an array we did: <complex type>[]
- now the type is another array: <base type>[][]

  <type>[][] <identifier>;
  <type> <identifier>[][];

What?
- create a 2D array
How?
- create the 1D array
- use a loop to allocate a new array in every position

What?
- create a 2D array shorthand
How?
  <identifier> = new <type>[<size1>][<size2>];

What?
- accessing the elements of a 2D array
How?
- need two indexes, one for the rows, one for the columns
- conventionally, treat the first set of brackets as the rows

What?
- initializing a 2D array
How?
- nested for loops

What?
- initializing a 2D array shorthand
How?
- nest the curly brace syntax

What?
- no limit on the number of dimensions an array can have
How?
- extend 2D to ND just like we extended 1D to 2D
Why?
- actually, uncommon in object oriented programming, 
  because we can use classes to better model such complex structures

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