###This brach is used to finish and maintain some basic class.
***All files were written in java.***  

####User:
*This class is used to describe the basic attributes and methods of the users of SuperAlarm.*
####UserManager:
*This class is a comprehensive class, which is used to finish registers and the management of users.*
####Item:
*This class is used to describe the basic attributes and methods of the items that is belonged to different users.*
####ItemManager:
*This class is a class, which is used to finish the management of many items to one person.*
