Java Requires Chilkat v11.0.0+

Get the Root of a JSON Document

See more JSON Examples

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonArray;
import com.chilkatsoft.chilkat2.JsonObject;

public class ChilkatExample {

    public static void main(String[] args) {
        JsonObject json = new JsonObject();

        String jsonStr = "{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}";

        try {
            json.load(jsonStr);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the "abc" object.
        JsonObject abcObj = new JsonObject();
        try {
            json.objectOf2("abc", abcObj);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
        abcObj.setEmitCompact(false);
        System.out.println(abcObj.emit());

        // Navigate to the "x" array
        JsonArray xArray = new JsonArray();
        abcObj.arrayOf2("x", xArray);

        // Navigate to the 2nd object contained within the array.  This contains members b1 and b2
        JsonObject bObj = new JsonObject();
        xArray.objectAt2(1, bObj);

        // Show that we're at "b1/b2".
        // The value of "b1" should be "200"
        System.out.println("b2 = " + bObj.intOf("b2"));

        // Now go back to the JSON doc root:
        JsonObject docRoot = new JsonObject();
        bObj.getDocRoot2(docRoot);

        // We'll skip the null check and assume it's non-null...

        // Pretty-print the JSON doc from the root to show that this is indeed the root.
        docRoot.setEmitCompact(false);
        System.out.println(docRoot.emit());
    }
}