How to use Java class type in code

I've used and extended classes where the name looks like ArrayAdapter<String> or HashMap<String, String>, but how can implement the type inside the <> myself? For example, I have a class that is currently used to store callback data. It looks like:

static class APICallback {
    boolean status;
    JsonObject data;
}

Is there a way for me to implement this so that I can code something like APICallback<List<String>> and have it know the data field will be a List<String> vs a JsonObject?