Question

import java.util.HashMap;

public class JSON {

    public String name;

    public HashMap<String, String> Credentials = new HashMap<String, String>();

    public JSON(String name){
        Credentials.put(name, name);
    }

}

JSON json = new JSON("Key1");
new Gson().toJson(json);

I get the following value as output.

{“Credentials”:{“Key1″:”Key1”}}

Now how would i create an JSONObject something like this below using Gson.

Answer 1

Building on what @Brian is doing, you just need the auto serialization piece.

What you do is the following, and I have to state, this is with regard to a single object at the moment. You’ll have to look through the GSON documentation for more detail on this if you’re dealing with a collection of objects at the top level.

Gson gson= new Gson();
Writer output= ... /// wherever you're putting information out to
JsonWriter jsonWriter= new JsonWriter(output);
// jsonWriter.setIndent("\t"); // uncomment this if you want pretty output
// jsonWriter.setSerializeNulls(false); // uncomment this if you want null properties to be emitted
gson.toJson(myObjectInstance, MyObject.class, jsonWriter);
jsonWriter.flush();
jsonWriter.close();

Hopefully that will give you enough context to work with. Gson should be smart enough to figure out your properties and give them sensible names in the output.