如何向动态数组中添加元素：
http://www.cnblogs.com/melao2006/p/4241688.html
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collecti
设置
A a = new A();
Field field = a.getClass().getDeclaredField("x");
field.setAccessible(true);
field.set(a, 1);
读取
Field f = a.getClass().getDeclaredField("x");
f.setAccessible(true)
