CS 206 - Introduction to Data Structures
ArrayList - Zipcode lookup
Due March 4 prior to 11:59:59 PM
Read the program design principles and code formatting
standards carefully. You are expected to adhere to all stated standards.
This project uses ArrayList (use java.util.ArrayList) and object-oriented design with inheritance. The general idea is that the data about zip codes contains some information, but not all information and not every time. So, you will create classes with inheritance that allow you to store all the data available in the minimum possible space. All of the data must be stored in a single ArrayList. You will then query the array list in a manner much like that of the previous assignment.
The lines in this file contain 12
comma-separated fields that look like this:
"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
The fields in each row are:
- zip code
- type -- ignored
- city name
- state abbreviation
- type 2 -- ignored
- long code -- ignored
- true or false -- ignored
- population 1
- population 2
- 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
to store group 2 data and another class
public class PopulatedPlace extends LocatedPlace
to store group 1 data.
- 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
Enter a zip code to lookup (00000 to quit): 88888
Enter a zip code to lookup (00000 to quit): 00000
- 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
- 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.
Your program will be graded based on how it runs on the
department’s Linux server, not how it runs on your computer.
1. README: The usual plain text file README
2. Source files:
3. Data files used: ziplocs.csv
DO NOT INCLUDE: Data files that are read from the class site.
The following steps for submission assume that you created a project directoryß named Assignment3 in the directory /home/YOU/cs206/
For more on using the submit script click here
- Put the README file into the project directory (/home/YOU/cs206/Assignment3)
- Go to the directory /home/YOU/cs206/Assignment3/
- Enter /home/gtowell/bin/submit -c 206 -p 3 -d Assignment3