Java

Loading and Parsing a JSON Array

See more JSON Examples

A JSON array is JSON that begins with "[" and ends with "]". For example, this is a JSON array that contains 3 JSON objects.

[{"name":"jack"},{"name":"john"},{"name":"joe"}]

A JSON object, however, is JSON that begins with "{" and ends with "}". For example, this JSON is an object that contains an array.

{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}

This example shows how loading a JSON array is different than loading a JSON object. Chilkat2 Java

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

public class ChilkatExample {

    public static void main(String[] args) {
        String strJsonArray = "[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]";

        String strJsonObject = "{\"pets\":[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]}";

        // A JSON array must be loaded using JsonArray:
        JsonArray jsonArray = new JsonArray();
        jsonArray.load(strJsonArray);

        // Examine the values:
        int i = 0;
        while (i < jsonArray.getSize()) {
            JsonObject jsonObj = jsonArray.objectAt(i);
            System.out.println(i + ": " + jsonObj.stringOf("name"));
            jsonObj.close();
            i = i + 1;
        }

        // Output is:

        //     0: jack
        //     1: john
        //     2: joe

        // A JSON object must be loaded using JsonObject
        JsonObject jsonObject = new JsonObject();
        jsonObject.load(strJsonObject);

        // Examine the values:
        i = 0;
        int numPets = jsonObject.sizeOfArray("pets");
        while (i < numPets) {
            jsonObject.setI(i);
            System.out.println(i + ": " + jsonObject.stringOf("pets[i].name"));
            i = i + 1;
        }

        // Output is:

        //     0: jack
        //     1: john
        //     2: joe
    }
}