System.getProperties().put("sun.misc.ProxyGenerator.saveGeneratedFiles",?"true");
Subject?subject?=?(Subject)?Proxy.newProxyInstance(Client.class.getClassLoader(),new?Class[]{Subject.class},new?JdkProxySubject(new?RealSubject()));
subject.hello();
MathSubject?mathSubject?=?new?MathSubject();
InvocationHandler?mathHandler=?new?ProxySubject(mathSubject);
Class<?>?cls?=?mathSubject.getClass();
Subject?mathSubjectResult?=?(Subject)?Proxy.newProxyInstance(Client.class.getClassLoader(),?cls.getInterfaces(),?mathHandler);

InvocationHandler?logmathHandler=?new?LogProxySubject(mathSubjectResult);

Subject??mathResult?=?(Subject)?Proxy.newProxyInstance(Client.class.getClassLoader(),?cls.getInterfaces(),?logmathHandler);

mathResult.hello("wahahaha");
mathResult.request();

// 根據資料，添加了LogProxySubject, ProxySubjec , 替換了JdkProxySubject中的Class換為Interface 接口類Subject,這樣就好了。

代理類實現的都是moveable接口，所以Class<?> cls = Car.getClass()這一行代碼不用更改，刪掉

Class?cls2=m.getClass();類加載器和接口換回cls就好。

JDK 動態代理作業可以參考這個

https://github.com/imooc-java/proxy/blob/master/src/test/java/com/imooc/jdkproxy/HandlerTest.java

有什么錯誤，你貼出來塞

第二行應該改成 Class<?> clsw = m.getClass();