Java Academy · Lesson

Simple CSV/JSON Handling

Learn to handle simple CSV and JSON data using built-in string operations and libraries.

Lesson 2 of 38 steps

Simple CSV/JSON Handling is a free Java Academy lesson on CoddyKit. This is lesson 2 of 3. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Java Academy learning path, and your progress syncs across the web and the CoddyKit app. The Java Academy course includes 3 lessons in total.

Intro

CSV and JSON are common formats. Java can handle them with simple tools: String.split for CSV and libraries like org.json for JSON.

CSV basics

CSV (Comma-Separated Values) stores rows of data separated by commas. Each line is one record.

Code: parse CSV

This splits a CSV line into fields. Output: Alice, 30, Engineer.

public class Main {
  public static void main(String[] args) {
    String line = "Alice,30,Engineer";
    String[] parts = line.split(",");
    for (String p : parts) {
      System.out.println(p);
    }
  }
}

JSON basics

JSON (JavaScript Object Notation) uses key-value pairs. Java has many libraries like org.json or Gson.

Code: parse JSON

This parses a JSON string and extracts fields using org.json.

import org.json.JSONObject;
public class Main {
  public static void main(String[] args) {
    String json = "{\"name\":\"Bob\",\"age\":25}";
    JSONObject obj = new JSONObject(json);
    System.out.println("Name: " + obj.getString("name"));
    System.out.println("Age: " + obj.getInt("age"));
  }
}

Code: generate JSON

This builds a simple JSON object with two fields and prints it.

import org.json.JSONObject;
public class Main {
  public static void main(String[] args) {
    JSONObject obj = new JSONObject();
    obj.put("city", "Paris");
    obj.put("population", 2148000);
    System.out.println(obj.toString());
  }
}

CSV check

Quick check: What is a common way to split CSV values?

Answer it in the interactive lesson

Recap

Recap: CSV uses commas, parsed with split(). JSON uses key-value pairs, parsed with libraries like org.json or Gson.

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Frequently Asked Questions

Is the “Simple CSV/JSON Handling” lesson free?

Yes — the full text of “Simple CSV/JSON Handling” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Java Academy course, upgrade to CoddyKit PRO. The Java Academy course includes 3 lessons in total.

What will I learn in “Simple CSV/JSON Handling”?

Learn to handle simple CSV and JSON data using built-in string operations and libraries. You practise Java Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Java Academy?

No prior experience is required. Java Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 2 of 3.

How long does the “Simple CSV/JSON Handling” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Java Academy lesson?

Yes. Every Java Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

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