Build a Java CSV Processor in Minutes with GitHub Copilot

Start Using Copilot

Install the GitHub Copilot extension for VS Code, register, and activate the 60‑day free trial. Copilot then acts as a pair‑programming assistant.

Assemble a Java Application to Process CSV Data

Create a file DataProcessor.java in a javapilot directory and add a comment describing the class:

// class for loading a csv file and storing data in a list of maps

Press Ctrl+Enter to let Copilot suggest the implementation, then accept the first suggestion, which adds getData, getColumnNames, and a main method.

Create an Example CSV File with Country Data

Create data.csv and add a comment describing the records:

// records for countries with comma separated values for country name, language, capital and population

Press Ctrl+Enter and accept Copilot’s suggestion. Remove the leading comment markers and any extra newline characters.

Print Column Names

Before the for loop in main, add a comment // print names of columns, press Ctrl+Enter, and accept the suggestion to generate code that prints the CSV header.

Run the program again; the output now includes column names.

Conclusion

After creating an empty Java file, three Ctrl+Enter invocations generated the full CSV‑processing code. Although the author is not a seasoned Java developer, Copilot accelerated development significantly.

// class for loading a csv file and storing data in a list of maps
// print names of columns

Additional comment for the CSV file:

// records for countries with comma separated values for country name, language, capital and population

Download CSV Data from a URL

Create DataProcessor2.java with a comment:

// class for downloading a csv file from GitHub and storing data in a list of maps

Press Ctrl+Enter and select the third suggestion. The resulting class differs from the first in three ways:

The constructor takes a url parameter.

An InputStreamReader is created from a URL object.

The constructor expects a URL, not a local file path.

Source: Lucas Jellema, technology.amis.nl