Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

 

import org.json.JSONObject;

 

public class Myclass {

    public static void main(String[] args) throws Exception {

        try {

            URL url = new URL("https://parseapi.back4app.com/classes/City?count=1&limit=10&keys=name,population");

            HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();

            urlConnection.setRequestProperty("X-Parse-Application-Id", "mxsebv4KoWIGkRntXwyzg6c6DhKWQuit8Ry9sHja"); // This is the fake app's application id

            urlConnection.setRequestProperty("X-Parse-Master-Key", "TpO0j3lG2PmEVMXlKYQACoOXKQrL3lwM0HwR9dbH"); // This is the fake app's readonly master key

            try {

                BufferedReader reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));

                StringBuilder stringBuilder = new StringBuilder();

                String line;

                while ((line = reader.readLine()) != null) {

                    stringBuilder.append(line);

                }

                JSONObject data = new JSONObject(stringBuilder.toString()); // Here you have the data that you need

                System.out.println(data.toString(2));

            } finally {

                urlConnection.disconnect();

            }

        } catch (Exception e) {

            System.out.println("Error: " + e.toString());

        }

    }

}

---------------------------------------------

This is the code I have so far for part 2. Am I doing this correctly?

public class city

 

{

 

     private String name;

 

     private int population;

 

     public City (String cityName, int cityPop)

 

     {

 

          name = cityName;

 

          population = cityPop;

 

        

 

     }

}

 

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.
expand button
Transcribed Image Text: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.
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