java - 如何将通用 JAXBElement 作为输入

Question

我有一个方法

public Response xyz ( JAXBElement<T> request ) {
......
}

两个不同的地方使用不同的 JAXBElement 调用它。一与 xyz(JAXBElement<a>)和其他 xyz(JAXBElement<B>)

如何使我的方法摄入通用，以便它适用于这两种方法？

Answer 1

请尝试:

xyz(JAXBElement<?> myElement);

请参阅此tutorial关于泛型:

So what is the supertype of all kinds of collections? It's written Collection<?> (pronounced "collection of unknown"), that is, a collection whose element type matches anything. It's called a wildcard type for obvious reasons. We can write:

void printCollection(Collection<?> c) {
    for (Object e : c) {
        System.out.println(e);
    }
}

and now, we can call it with any type of collection.