write another small expulsion management procedures. According to the AbstractStudent, Teacher, Time, AbstractStudentManager, and has created three categories BachlorStudent, GraStudent, ConcreteStudentManager establish an expulsion StudyManager and Management with main function

homework
........\bak
........\...\AbstractStudentManager.java~1~
........\...\AbstractStudentManager.java~2~
........\...\ConcreteStudentManager.java~1~
........\...\ConcreteStudentManager.java~2~
........\...\ConcreteStudentManager.java~3~
........\...\ConcreteStudentManager.java~4~
........\...\Elect.java~1~
........\...\Elect.java~2~
........\...\Event.java~1~
........\...\GraStudent.java~1~
........\...\StudyManager.java~10~
........\...\StudyManager.java~1~
........\...\StudyManager.java~2~
........\...\StudyManager.java~3~
........\...\StudyManager.java~4~
........\...\StudyManager.java~5~
........\...\StudyManager.java~6~
........\...\StudyManager.java~7~
........\...\StudyManager.java~8~
........\...\StudyManager.java~9~
........\classes
........\.......\AbstractStudent.class
........\.......\AbstractStudentManager.class
........\.......\BachlorStudent.class
........\.......\ConcreteStudentManager.class
........\.......\Elect.class
........\.......\GraStudent.class
........\.......\Major.class
........\.......\package cache
........\.......\.............\unnamed package.dep2
........\.......\SameStudentIDException.class
........\.......\StudentInfo.class
........\.......\StudentNotFoundException.class
........\.......\StudyManager$ElectMajor.class
........\.......\StudyManager$ElectTeacher.class
........\.......\StudyManager.class
........\.......\Teacher.class
........\.......\TeacherInfo.class
........\.......\Time.class
........\homework.jpx
........\homework.jpx.local
........\homework.jpx.local~
........\homework.jpx~
........\java作业2.txt
........\src
........\...\AbstractStudent.java
........\...\AbstractStudentManager.java
........\...\BachlorStudent.java
........\...\ConcreteStudentManager.java
........\...\Event.java
........\...\GraStudent.java
........\...\Information.java
........\...\SameStudentIDException.java
........\...\StudentNotFoundException.java
........\...\StudyManager.java
........\...\Teacher.java
........\...\Time.java

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