Android™ How to Program, Second Edition

Using Arrays to Analyze Survey Results

Our next example uses arrays to summarize data collected in a survey. Consider the following problem statement:

Twenty students were asked to rate on a scale of 1 to 5 the quality of the food in the student cafeteria, with 1 being “awful” and 5 being “excellent.” Place the 20 responses in an integer array and determine the frequency of each rating.

This is a typical array-processing application (Fig. E.7). We wish to summarize the number of responses of each type (that is, 1–5). Array responses (lines 9–10) is a 20-element integer array containing the students’ survey responses. The last value in the array is intentionally an incorrect response (14). When a Java program executes, array element indices are ...