What does it mean when a generics function has two return types?

问题

I am going through a tutorial and I found this particular code.

 private <V> V fromJson(HttpRequest request, Class<V> target) throws IOException {
    Reader reader = request.bufferedReader();
    try {
        return GSON.fromJson(reader, target);
    } catch (JsonParseException e) {
        throw new JsonException(e);
    } finally {
        try {
            reader.close();
        } catch (IOException ignored) {
            // Ignored
        }
    }
}

I notice that the fromJson function has two return types? I have the basic idea of generics and how it works. What I can't understand is how are two types specified and how will this function know which type to assign the value to when its called.

回答1:

No, there is only one return type. The <V> declares the V generic type parameter (it makes the method generic), and the V after that is the actual return type.

Here's more information on generic methods in Java.

来源：https://stackoverflow.com/questions/17604970/what-does-it-mean-when-a-generics-function-has-two-return-types