readme.txt

简易的学生课程成绩系统

/*3062211067 李晶晶*/

The database is stored in the database.csv,you can read the data from it or do modification.

five basic classes
Course.java record one course that contain student who have learned and the score which he gets
 
Student.java  record one student that learn course and the score he gets
 
CourseInf.java  record one couse that students have learnd and scores they get

Mark.java  record the course and the score 

CompareString.java to compare two strings which the strings may different number of spaces.

four main functions

The Input.java input the name of the student, the name of the course and the marks. then try to find the student in the database and add or replace the score for the course. If the student can not be found in the database, a new student should be created and be put into the database. If the course can not be found in the records of the student, a new record for the course should be created, otherwise, the score should be replaced by the newly inputed one. 

The Import.java read the records from import.csv,and write data to database.csv(how to write is the same rule as the UpdateDBInput)

The QueryStudent.java input the student's name and list the course and scores this student have learned with the total and average score.

The QueryCourse.java input the course name and list the students and score gets with the number of students and average score.