1. JSON in Java JSON-P API (JSON Processing)
javax.json.*
Unfortunately: not part of Java SE, but Java EE (7,8)
JSON syntax definition:

2. Three models JSON-P Object model (similar to DOM for XML)
javax.json.JsonObject, javax.json.JsonArray,
JSON-P Straming model (similar to StAX for XML)
javax.json.stream.JsonParser, javax.json.JsonWriter
JSON Binding (JSON-B similar to JAXB)
(official only in EE8)
javax.json.bind.Jsonb, javax.json.bind.JsonBuilder

3. Examples
private String json = "{\"id\": , " + "\"title\": \"Fun with JSON-Processing\", " + "\"published\": true}"; JsonReader jsonReader = Json.createReader( new StringReader(json)); JsonObject jsonObject = jsonReader.readObject(); jsonReader.close(); jsonObject.getInt("id") jsonObject.getString("title") jsonObject.getBoolean("published")

4. Examples
JsonObject jsonObject = Json.createObjectBuilder() .add("id", ) .add("title", "Fun with JSON-Processing") .add("published", true) .build(); jsonObject.getInt("id") jsonObject.getString("title") jsonObject.getBoolean("published")

5. Further hints:
JSON Binding API in a nutshell
Jsonb intro