JSON PROJECT

CSCI 321 Program Project 1

Due date May 25

Project 1 contains three parts:

1. Access city data from API. Learn JSON and REST API.

2. Write a java algorithm process data.

3. Run your program with different input size, measure execution time and plot time against input size.

Part 1. In software development, it is common to use third party API access data or service. In project 1,

you access city data at

https://www.back4app.com/database/back4app/list-of-all-continents-countries-cities/get-

started/java/rest-api/httpurlconnection

1. As we don’t connect a real app to this API, select “use a fake app”

2. Select:

City,

Find Many and Count,

Fields: name, population

(no filter)

(no sort)

Paginate (0, 10) for test

3. Use the sample code provided to access data and create as JSON object.

You need to download a JSON library jar file and import this jar file to external library.

JSON is a lightweight language-independent data interchange format. Download JSON jar file at

https://github.com/stleary/JSON-java

JSON Tutorial https://www.json.org/json-en.html

To import jar file in your Eclipse IDE, follow the steps below.

 Right click on your project

 Select Build Path

 Click on Configure Build Path

 Click on Libraries and select Add External JARs

 Select the jar file from the required folder

 Click and Apply and Ok

REST API Tutorial https://restfulapi.net/

https://www.back4app.com/database/back4app/list-of-all-continents-countries-cities/get-started/java/rest-api/httpurlconnection

https://www.back4app.com/database/back4app/list-of-all-continents-countries-cities/get-started/java/rest-api/httpurlconnection

https://github.com/stleary/JSON-java

https://www.json.org/json-en.html

https://restfulapi.net/

Part 2. Access all city population data from this API. Write a Java program to find cities in top 50% –

55% in terms of population.

 Must create city as Class / object, which contains: String name, and int population.

 To implement comparable interface at city Class, so that two cities can use compareTo( )

method based on population.

 It’s recommended to use Java library container, such as ArrayList. in your program. Refer to

Chapter 3. Also read generic type at assigned reading section in Chapter 1.

Part 3. Run the program with different input size, for example the number of cities 30,000, 60,000,

90,000, 120,000, etc. measure the execution time, and plot your result.

You need to submit:

1. A project report in PDF (preferred) or Word file contains

a. Brief description of your algorithm design;

b. Time complexity analysis of your program in Big-O;

c. A table contains a number of input size and execution time;

d. A plot shows execution time against input size.

2. Source code (.java files)

3. JPEG screen shot clearly show the execution your program in Eclipse

Note:

 JSON is used in API example program. It is a common data format in app. Yet, you don’t have to

use JSON in your program.

 You can choose appropriate input size for each test case. Each input size and its execution time

become one dot in the plot. To make the plot meaningful, it is recommended to have 5 to 8

dots. Basically, this plot should roughly match Big-O complexity. Refer to Figure 2.3 on page

34.

 To measure the execution time, you need to use appropriate time unit. Refer to Max

subsequence program from source code link in the syllabus,

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