Java 泛型 : Require generic to be subclass of a certain type

Question

我有一个抽象泛型类:

public abstract class AbstractMessageHandler<T extends AbstractMessageHandler>
{
    public abstract List<String> getTypesOfMessages();
    public abstract void handleMessage(String message, CometClient client);

    public T setResponseValues(AbstractMessage request, T response )
    {
        response.setCompanyId(request.getCompanyId());
        response.setMessageGroup(request.getMessageGroup());
        response.setUserId(request.getUserId());
        response.setTimeStamp(AbstractMessage.getCurrentTimeStamp());

        return response;
    }
}

我需要通用子类成为此类的子类。换句话说，泛型必须是 AbstractMessageHandler 的子类。然而，这给了我编译问题。谁能告诉我我做错了什么？

谢谢

Answer 1

你需要按照枚举类的例子:

public abstract class AbstractMessageHandler<T extends AbstractMessageHandler<T>>