想动态代理TreeSet集合，代理类能用的方法只能是Set集合里面的方法吗？难道不能用代理类的对象调用TreeSet集合特有的方法吗？(比如pollFirst方法)
求大神解答！！！


package com.lianxi.test02;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;

public class Test1 {

    public static void main(String[] args) {
        
        final TreeSet ts = new TreeSet();
        Set proxy = (Set)Proxy.newProxyInstance(TreeSet.class.getClassLoader(),
                TreeSet.class.getInterfaces(),
                new InvocationHandler() {
                    
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args)
                            throws Throwable {
                        long beginTime = System.currentTimeMillis();
                        Object retVal = method.invoke(ts, args);
                        long endTime = System.currentTimeMillis();
                        System.out.println(method.getName()+" running time is "+(endTime-beginTime));
                        return retVal;
                    }
                });
        
        proxy.add("Tom");
        proxy.add("Tommy");
        proxy.add("Ben");
        
        System.out.println(proxy.toString());
    }
   
}