Handling null values (JSONObject)

NullTest.java

package org.openbravo.test;

import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;

/**
 * @author iperdomo
 */
public class NullTest {

  public static void main(String[] args) throws JSONException {

    // https://fisheye.codehaus.org/browse/jettison/trunk/src/main/java/org/codehaus/jettison/json/JSONObject.java?r=104

    JSONObject test = new JSONObject("{ \"address\": null}");

    /**
     * JSONObject.NULL is equivalent to the value that JavaScript calls null, whilst Java's null is
     * equivalent to the value that JavaScript calls undefined.
     */

    // false
    System.out.println(test.get("address") == null);
    System.out.println(test.getString("address").equals(null));

    /**
     * 
     * It is sometimes more convenient and less ambiguous to have a NULL object than to use Java's
     * null value.
     * 
     * JSONObject.NULL.equals(null) returns true.
     * 
     * JSONObject.NULL.toString() returns "null".
     */

    // true
    System.out.println(test.get("address").equals(null)); // Preferred way
    System.out.println(test.getString("address").equals("null"));

    try {
      System.out.println(test.get("nonexistent") == null);
      System.out.println(test.getString("nonexistent").equals("null"));
    } catch (Exception e) {
      System.err.println(e);
    }

  }
}

The result is:

false
false
true
true
org.codehaus.jettison.json.JSONException: JSONObject["nonexistent"] not found.

Thanks. This helped.

this works !