Java で JSON データを文字列に変換する

import org.json.CDL;
import org.json.JSONArray;
import org.json.JSONTokener;

public class JavaArticles {
  public static void main(String[] args) {
    String JsonData = "CANADA, UK, USA"; // Taking the JSON data as string

    JSONArray JsonArray =
        CDL.rowToJSONArray(new JSONTokener(JsonData)); // Converting to the JSON array
    System.out.println(JsonArray); // Printing the JSON array

    System.out.println(CDL.rowToString(JsonArray));

    JsonArray = new JSONArray(); // Creating a JSON array object.
    JsonArray.put("ID"); // Put a field to JSON array name `ID`
    JsonArray.put("Name"); // Put a field to JSON array name `Name`
    JsonArray.put("Age"); // Put a field to JSON array name `Age`
    JsonData = "1, Alex, 25 \n"
        + "2, Robert, 30 \n"
        + "3, Micle, 27"; // Taking the JSON data as string
    System.out.println(CDL.toJSONArray(JsonArray, JsonData)); // Printing the JSON data
  }
}

["CANADA","UK","USA"]
CANADA,UK,USA

[{"Age":"25","ID":"1","Name":"Alex"},{"Age":"30","ID":"2","Name":"Robert"},{"Age":"27","ID":"3","Name":"Micle"}]

{
  "name":"Thomas",
  "age":22,
  "hobbies":["Gardening","Swimming"],
  "languages":{"English":"Advanced"}
}

import java.nio.file.Files;
import java.nio.file.Paths;

public class ReadJsonFileAsString {
  public static void main(String[] args) throws Exception {
    String Myfile = "test/resources/myFile.json";
    String JsonData = readFileAsString(Myfile);
    System.out.println(JsonData);
  }
  public static String readFileAsString(String Myfile) throws Exception {
    return new String(Files.readAllBytes(Paths.get(Myfile)));
  }
}

{
  "name":"Thomas",
  "age":22,
  "hobbies":["Gardening","Swimming"],
  "languages":{"English":"Advanced"}
}