1st days: Set Encapsulation

Encapsulate the set and expose the required interfaces to external users, such as AddStudent and RemoveStudent.

And attribute Count

Instead of exposing the entire set for external users to operate

 

Codepublic class MyCollection {public MyCollection () {list = new List <StudentInfo> ();} private List <StudentInfo> list = null; public void AddStudent (StudentInfo studentInfo) {list. add (studentInfo);} public void RemoveStudent (StudentInfo studentInfo) {if (list. contains (studentInfo) {list. remove (studentInfo) ;}} public int Count {get {return list. count ;}} public class StudentInfo {public int Id {get; set ;}public string Name {get; set ;}}