0Pricing
Java Academy · Lesson

Simple CSV/JSON Handling

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

Simple CSV/JSON Handling is a free Java Academy lesson on CoddyKit — 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, one of 3 lessons in the course, and your progress syncs across the web and the CoddyKit app.

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?

Recap

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

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, and the Java Academy course includes 3 lessons in total. 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.

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; this is — lesson 2 of 3, so you can start here or from the beginning and move at your own pace.

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.

All lessons in this course

  1. Serialization Basics
  2. Simple CSV/JSON Handling
  3. File Walking & Utilities
← Back to Java Academy