CS 206 - Introduction to Data Structures

Homework 2

ArrayList - Zipcode lookup

Due March 4 prior to 11:59:59 PM

Overview

Data

ziplocs.csv

      "00705","STANDARD","AIBONITO","PR","PRIMARY",18.14,-66.26,"NA-US-PR-AIBONITO","false",,,
      "09005","MILITARY","APO","AE","PRIMARY",,,"EU-DE-WEISBADEN AAF OMDC","false",,,
      "10029","STANDARD","NEW YORK","NY","PRIMARY",40.71,-73.99,"NA-US-NY-NEW YORK","false",31490,48403,1050141146

0. zip code
1. type -- ignored
2. city name
3. state abbreviation
4. type 2 -- ignored
5. Latitude
6. Longitude
7. long code -- ignored
8. true or false -- ignored
9. population 1
10. population 2
11. another number -- ignored

For this assignment we care about only: zip code, city name, state, latitude, longitude and population 2. Some lines are missing the longitude and latitude (like the second sample line), some are missing population, but all lines have the correct number of commas (11). There are no lines for which the longitude and latitude are not known but the population is known.

Given this final statement, the data falls into 3 groups: 1: those for which location and population are known, 2: those for which only location is known, 3: those for which neither location nor population is known. You first task is to design a set of java classes so that each of these groups can be stored in a instance that is capable of storing the available information, and no more. These java classes MUST be linked to each other using inheritance. For instance, if you define a class Place that stores group 3 data, then you might make a class

      public class LocatedPlace extends Place

      public class PopulatedPlace extends LocatedPlace

Requirements

• You must store data in classes you create. These classes should hold exactly as much information as is contained a row of the data file. You may use the class design suggested above for your classes.
• You MUST use inheritance in your class design.
• The only Data Structure you should use in this assignment is ArrayList. You may use exactly one ArrayList. Do not use arrays or anything else.
• You may read the contents of ziplocs at most once.
• After reading in the data, your program should support user interaction similar to the following:

  Enter a zip code to lookup (00000 to quit): 19380
          West Chester,PA 19380       Pop:43281  Lat:39.95  Lon:-75.60
  Enter a zip code to lookup (00000 to quit): 07040
        Maplewood,NJ 07040       Pop:20973  Lat:40.73  Lon:-74.27
  Enter a zip code to lookup (00000 to quit): 00614
        Arecibo,PR 00614       Lat: 18.45  Lon:-66.73
  Enter a zip code to lookup (00000 to quit): 09848
        Apo,AE 09848
  Enter a zip code to lookup (00000 to quit): 88888
        Not Found
  Enter a zip code to lookup (00000 to quit): 00000
  Goodbye
        

• All printing of information about a place should be done from toString. So, for instance, in the above interaction all of the printout of search results (other than "not found") should be done with a single line which might look like
  System.out.println(place);
• Encapsulation. All classes should expose only that which other classes need. There should be no public instance variables
• Statics. Do not use any static variables or static methods.
• Scanner. Use the java Scanner class for user interaction only. All files should be read using BufferedReader and parsed using the split method of the String class. The split method has an interesting property. Given the string "a,,,b,,,,," and an instruction to split on ",", the returned array will be of length 4, not 9. That is, split will not extend the returned array to include space for trailing splits that have no data.

Electronic Submissions

1. README:

The following steps for submission assume that you created a project directoryß named Assignment3 in the directory /home/YOU/cs206/

1. Put the README file into the project directory (/home/YOU/cs206/Assignment3)
2. Go to the directory /home/YOU/cs206/Assignment3/
3. Enter /home/gtowell/bin/submit -c 206 -p 3 -d Assignment3