如果我理解你要做什么，你应该能够用动态代理。下面是在运行时实现接口而不明确知道接口类型的示例：

If I understand what you're trying to do, you should be able to pull it off with dynamic proxying. Here's an example of implementing an interface at runtime without explicitly knowing the interface's type:

import java.lang.reflect.*;

public class ImplementInterfaceWithReflection {
    public static void main(String[] args) throws Exception {
        String interfaceName = Foo.class.getName();
        Object proxyInstance = implementInterface(interfaceName);
        Foo foo = (Foo) proxyInstance;
        System.out.println(foo.getAnInt());
        System.out.println(foo.getAString());
    }

    static Object implementInterface(String interfaceName)
            throws ClassNotFoundException {
        // Note that here we know nothing about the interface except its name
        Class clazz = Class.forName(interfaceName);
        return Proxy.newProxyInstance(
            clazz.getClassLoader(),
            new Class[]{clazz},
            new TrivialInvocationHandler());
    }

    static class TrivialInvocationHandler implements InvocationHandler {
        @Override
        public Object invoke(Object proxy, Method method, Object[] args) {
            System.out.println("Method called: " + method);
            if (method.getReturnType() == Integer.TYPE) {
                return 42;
            } else {
                return "I'm a string";
            }
        }
    }

    interface Foo {
        int getAnInt();
        String getAString();
    }
}