實現Foreach遍歷的集合類，需要實現IEnumerable接口，泛型集合則需要實現IEnumerable<T>接口

   ListForeach<T> :IEnumerable<T>   T : ,  index =  ListForeach(=    (index >==  T[array.Length * 

                array =++] = IEnumerator<T>  TEnumeratro<T>   TEnumeratro<T> : IEnumerator<T>   position = - TEnumeratro(T [] array, .arr =.count = =    ++ (position <  
                  .position = -

客戶端代碼

   Age {;   Name { ;   Main(<Student> list =  ListForeach<Student>( Student() {Age=,Name= Student() { Age = , Name =  Student() { Age = , Name =  Student() { Age = , Name =  Student() { Age = , Name =  Student() { Age = , Name =  ( s ++<Student> list1 =  ListForeach<Student>( Student(){ Age=,Name= Student(){ Age=,Name= Student(){ Age=,Name= Student(){ Age=,Name= ( s +  +