Is it possible to use generic like C++ templates?

Question

Java

Is it possible to do something like this:

private LongPollServer initServer (Resp1 r)  .....
private LongPollServer initServer (Resp2 r)  .....
private LongPollServer initServer (Resp3 r)  .....

protected <R> void run (ApiRequest<R> req)
{
    .....
    LongPollServer lps = initServer((R)req.exec());
    .....
}

It is known that run will be called from types that inherit from ApiRequestBuilder[ApiReqest[Resp1],Resp1], which inherits from ApiReqest[Resp1]. And similarly with 2.3. Read square brackets as angle brackets.
exec will return Resp1,2,3 respectively.
Perhaps you need to use generic with questions. familiar...

Answer 1

In the end I wrote this:

private LongPollServer initServer (Object lpServerResponse) {
    if (lpServerResponse instanceof GetLongPollServerResponse)
          return new LongPollServer()
                .setKey(((GetLongPollServerResponse)lpServerResponse).getKey())
                .setTs(((GetLongPollServerResponse)lpServerResponse).getTs())
                .setServer(((GetLongPollServerResponse)lpServerResponse).getServer());
    else if (lpServerResponse instanceof com.vk.api.sdk.objects.messages.responses.GetLongPollServerResponse)
      return new LongPollServer()
                .setKey(((com.vk.api.sdk.objects.messages.responses.GetLongPollServerResponse)lpServerResponse).getKey())
                .setTs(((com.vk.api.sdk.objects.messages.responses.GetLongPollServerResponse)lpServerResponse).getTs().toString())
                .setServer(((com.vk.api.sdk.objects.messages.responses.GetLongPollServerResponse)lpServerResponse).getServer());
    else
      return new LongPollServer()
                .setKey(((com.vk.api.sdk.objects.callback.longpoll.responses.GetLongPollServerResponse)lpServerResponse).getKey())
                .setTs(((com.vk.api.sdk.objects.callback.longpoll.responses.GetLongPollServerResponse)lpServerResponse).getTs())
                .setServer(((com.vk.api.sdk.objects.callback.longpoll.responses.GetLongPollServerResponse)lpServerResponse).getServer());
    }

But it doesn't work for other reasons :(