public class DynamicSubject implements InvocationHandler{
private Object sub;
public DynamicSubject(Object sub) {
this.sub = sub;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
method.invoke(sub,args);
return null;
}
}
public class Client{
public static void main(String[] args) {
RealSubject realSubject = new RealSubject();
InvocationHandler handler = new DynamicSubject(realSubject);
Class<?> classType = handler.getClass();
Subject pro = (Subject)Proxy.newProxyInstance(
classType.getClassLoader(),
realSubject.getClass().getInterfaces(),handler);
pro.request();
}
}
我的问题是：Subject pro = (Subject)Proxy.newProxyInstance(classType.getClassLoader(),realSubject.getClass().getInterfaces(),handler);这行代码返回的到底是个什么？就是Subject类型？还是强制转换了？为什么执行pro.request();之后会调用DynamicSubject类里面的那个method.invoke方法 Invocation这个接口和Proxy.newProxyInstance这个方法到底怎么理解