(Java) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkJsonObject json = new CkJsonObject();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    String jsonStr = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}";

    boolean success = json.Load(jsonStr);
    if (success != true) {
        System.out.println(json.lastErrorText());
        return;
        }

    // Get the "image" object.
    CkJsonObject imageObj = json.ObjectOf("image");
    if (json.get_LastMethodSuccess() == false) {
        System.out.println("image object not found.");
        return;
        }

    System.out.println("image: fname=" + imageObj.stringOf("fname") + ", width=" + imageObj.IntOf("w") + ", height="
         + imageObj.IntOf("h"));

    // Get the "thumbnail" object.
    CkJsonObject thumbObj = json.ObjectOf("thumbnail");
    if (json.get_LastMethodSuccess() == false) {
        System.out.println("thumbnail object not found.");
        return;
        }

    System.out.println("thumbnail: fname=" + thumbObj.stringOf("fname") + ", width=" + thumbObj.IntOf("w") + ", height="
         + thumbObj.IntOf("h"));
  }
}