Test for method generic type parameter info with proxy

Test.java

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class Test {


    public interface TestService{
        List<Map<String,Object>>  list(List<Map<String,Object>> list);
    }

    public static class TestServiceImpl implements TestService{

        public List<Map<String, Object>> list(List<Map<String, Object>> list) {
            return list;
        }

    }

    public static TestService proxy(TestService bean){
        return (TestService) Proxy.newProxyInstance(Test.class.getClassLoader(), new Class[]{TestService.class}, new InvocationHandler() {

            public Object invoke(Object proxy, Method method, Object[] args)
                    throws Throwable {
                return null;
            }
        });
    }

    static Type[] getGenericTypeParams(TestService bean) throws Exception{
        //这里使用getClass而不是直接TestService.class
        Class<?> clazz=bean.getClass();
        return clazz.getDeclaredMethod("list", List.class).getGenericParameterTypes();
    }

    public static void main(String[] args) throws Exception{
        TestService rawBean=new TestServiceImpl();
        TestService proxyBean=proxy(rawBean);
        System.out.println(Arrays.toString(getGenericTypeParams(rawBean)));
        System.out.println(Arrays.toString(getGenericTypeParams(proxyBean)));
    }
}