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

public class ArrayListTest implements InvocationHandler {

    private Object target;

    public ArrayListTest() {

    }

    public ArrayListTest(Object target) {
        this.target = target;
    }

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

    public static Object factory(Object target) {
        ArrayListTest alt = new ArrayListTest(target);
        return Proxy.newProxyInstance(target.getClass().getClassLoader(),
                target.getClass().getInterfaces(), alt);
    }

    public static void main(String[] args) {

        @SuppressWarnings("unchecked")
        List<String> arraylist = (List<String>) factory(new ArrayList<String>());

        arraylist.add("hello");

        System.out.println(arraylist);
    }
}