How to read json file into java with simple JSON library

To read a JSON file into Java using the Simple JSON library, you can use the JSONObject class and the JSONArray class.

Here's an example of how you can read a JSON file into a Java object using the Simple JSON library:

import org.json.simple.JSONObject;
import org.json.simple.JSONArray;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import java.io.FileReader;
import java.io.IOException;

public class Main {
  public static void main(String[] args) {
    // Create a JSON parser
    JSONParser parser = new JSONParser();

    try {
      // Read the JSON file and parse it
      Object obj = parser.parse(new FileReader("data.json"));

      // Convert the parsed object to a JSONObject
      JSONObject jsonObject = (JSONObject) obj;

      // Get the value of the "name" field
      String name = (String) jsonObject.get("name");
      System.out.println(name); // prints "John Smith"

      // Get the value of the "age" field
      long age = (long) jsonObject.get("age");
      System.out.println(age); // prints 30

      // Get the value of the "skills" field
      JSONArray skills = (JSONArray) jsonObject.get("skills");
      for (Object skill : skills) {
        System.out.println(skill); // prints "Java" and "Python"
      }
    } catch (IOException | ParseException e) {
      e.printStackTrace();
    }
  }
}

In this example, the JSONParser is used to parse the JSON file and create a Java object. The object is then cast to a JSONObject and the values of the various fields are extracted using the get() method.

I hope this helps! Let me know if you have any questions.