Exercise: Weather Data Analyzer

Background

Imagine you are developing an application for a weather service. The service provides weather

data in JSON format. Your task is to create a Java application that allows users to input JSONPath

queries to retrieve specific information from the weather data.

Objective

Develop a Java application that reads a JSON file containing weather data and allows the user to

input JSONPath queries to extract specific information.

Requirements

$1.$ JSON File $($weather$.$json$)$:

o Create a JSON file representing weather data. The file should include information

like temperature, humidity, wind speed, and weather conditions for different cities

or times.

o Example JSON structure:

$\{$

"weatherData": $[$

$\{$

"city": "New York",

"temperature": $22,$

"humidity": $80,$

"conditions": "Sunny"

$\},$

$\{$

"city": "London",

"temperature": $16,$

"humidity": $65,$

"conditions": "Cloudy"

$\}$

$//$ More data...

$]$

$\}$

$1.$ Java Application:

o Write a Java program that reads the weather.json file.

o The program should prompt the user to enter a JSONPath query.

o Process the JSONPath query and display the matching elements from the JSON

file.

o Handle exceptions such as invalid JSONPath syntax or file read errors.

$2.$ Sample JSONPath Queries:

o All cities with temperature above $20\backslash$deg C: $$.$weatherData$[?($@$.$temperature $>$

$20)].$city

pg$.2$

o Humidity in London: $$.$weatherData$[?($@$.$city $==$ 'London'$)].$humidity

o All weather conditions listed: $$.$weatherData$[*].$conditions

Steps to Follow

$1.$ Set Up Environment:

o Ensure Java SDK is installed, and an IDE is set up$.$

o Include a JSON processing library like Jackson or json$-$simple in your project.

$2.$ JSON File Creation:

o Create the weather.json file with a proper structure and sample data.

$3.$ Java Program Development:

o Start by setting up the JSON parsing using your chosen library.

o Implement JSONPath processing $($libraries like Jayway's JsonPath can be used$).$

o Develop the user interface for inputting JSONPath queries and displaying results.

$4.$ Testing:

o Test the application with different JSONPath queries to ensure it accurately queries

and displays data from the JSON file.

$5.$ Advanced Challenges $($Optional$)$:

o Extend the application to fetch real$-$time weather data from an API.

o Implement additional features like data filtering or sorting based on user input.