设计一个集合类，用来处理整型数。并具有以下功能：

1.具有为集合增加元素的功能。

2.具有处理交集，并集功能，并用“+”表示并集，“*”表示交集。

3.有用链表来存储集合的功能。

-To design a collection class to handle integer. And has the following features: 1. Has increased for the collection of functional elements. 2. Have to deal with intersection, and set functions, and "+"　that they set, "*"　that intersection. 3. A useful list of functions to store the collection.