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copied!<p>The way to make Gson understand it is to write a custom deserializer by creating a <code>TypeAdapter</code> for your <code>Test</code> class. You can find information in <a href="https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer" rel="nofollow"><strong>Gson's User Guide</strong></a>. It is not exactly a <em>manual parsing</em>, but it is not that different, since you have to tell Gson how to deal with each JSON value...</p> <p>It should be something like this:</p> <pre><code>private class TestDeserializer implements JsonDeserializer<Test> { public Test deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { JsonObject obj = json.getAsJsonObject(); int id = obj.get("id").getAsInt(); String name = obj.get("name").getAsString(); double distance = obj.get("param_distance").getAsDouble(); int sampling = obj.get("param_sampling").getAsInt(); //assuming you have suitable constructors... Test test = new Test(id, name, new Parameters(distance, sampling)); return test; } } </code></pre> <p>Then you have to register the <code>TypeAdapter</code> with:</p> <pre><code>GsonBuilder gson = new GsonBuilder(); gson.registerTypeAdapter(Test.class, new TestDeserializer()); </code></pre> <p>And finally you just have to parse your JSON as usual, with:</p> <pre><code>gson.fromJson(yourJsonString, Test.class); </code></pre> <p>Gson will automatically use your custom deserializer to parse your JSON into your <code>Test</code> class.</p>

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