How to get a value from gson object by key

Question

I have been trying to follow along with this solution How to find specified name and its value in JSON-string from Java?

However it does not seem to make sense.

I define a new gson object from a string:

Example of string here: http://api.soundrop.fm/spaces/XJTt3mXTOZpvgmOc

public void convertToJson()
{
    Gson gson = new Gson();
    Object gsonContent = gson.fromJson( stringContent, RadioContent.class );
}

And then try and return a value:

public Object getValue( String find )
{
    return gsonContent.find;
}

Finally its called with:

public static void print( String find = "title" )
{
    Object value = radioContent.getValue( find );

    System.out.println( value );
}

However I am getting an error:

java: cannot find symbol
  symbol:   variable find
  location: variable gsonContent of type java.lang.Object

Full classes: Main class: http://pastebin.com/v4LrZm6k Radio class: http://pastebin.com/2BWwb6eD

Answer 1

This is Java. Fields are resolved based on the declared type of the object reference.

Based on your compiler error, gsonContent is a variable of type Object. Object does not have a find field.

You're already telling Gson what type to deserialize to, so just make the gsonContent variable be of that type

RadioContent gsonContent = gson.fromJson( stringContent, RadioContent.class );

Also, it seems like you are shadowing the instance gsonContent field with a local variable.

---

You can do the following as well

JsonObject jsonObject = gson.fromJson( stringContent, JsonObject.class);
jsonObject.get(fieldName); // returns a JsonElement for that name