| . 5 pts. 2 for the header, the rest for the implementation. | |
| Every year, a census of birds is taken on April 1. Bird watchers in each district count how many birds they see of each species of interest. The result are collected into a 2-D array, with one row for each district and one column for each bird species. |
Define a method which, given a species (an index number) and a 2-D
array of data, returns how many different districts actually saw birds
of that species. Implement the method.
These constants exist: final static int NUMD = ... //number of districts final static int NUMS = ... //number of species Otherwise, the method doesn't depend on any instance or class data. |
public int countD(int[][] data, int sIndex) { //"public static" optional
int count = 0;
for (int d = 0; d < NUMD; d++) {
if (data[d][sIndex] > 0) {
count++;
}
}
return count;
}
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| . 5 points (-1 for each missing or incorrect arrow) | |
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Here's what you know about how a set of classes are related:
A is a subclass of C B extends A D is-a E C is the base class of E |
Draw a diagram to show how the classes are related. Make one rectangle per class. Draw an arrow from X to Y if X extends Y. |
Should be 4 arrows: A to C, B to A, D to E, E to C. |
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