querystudent.java

简易的学生课程成绩系统

import java.util.*;
import java.io.*;
import java.lang.*;
public class QueryStudent
{   
     public static void main(String args[])
    {
     try{
          System.out.println("Please input student name to query or input 'stop' to end query");
          BufferedReader readfile = new BufferedReader(new FileReader("database.csv"));
          BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
          String inputName = (input.readLine()).trim();
          String line;
          int total;
          int average;
          while(!(inputName.equals("stop")))
          {
              Student student1 = new Student(inputName);
              while((line = readfile.readLine())!=null)
            {
               String [] record = line.trim().split(",");
               Integer i;
               i = new Integer(record[2]) ;
               CompareString s=new CompareString();
               boolean flag=s.compare(inputName,record[0]);
               if(flag==true)
               {
                    Mark newmark;
                    newmark = new Mark(record[1],i);
                    student1.addMark(newmark);
                }
            }        
            if(student1.getSize()==0)
             System.out.println("There is no record for this student!!!");
            else
            {
              student1.showMarks();
              total = student1.getTotalScore();
              average = total / student1.getSize();
              System.out.print("The total score is: ");
              System.out.println(total);
              System.out.print("The average score is: ");
              System.out.println(average);
            }
           input = new BufferedReader(new InputStreamReader(System.in));
           inputName = (input.readLine()).trim();
      }
      readfile.close();
    }
    catch(FileNotFoundException e)
    {
       System.out.println("File not found");
    }
    catch(IOException e)
    {
       System.out.println("IO Exception");
       }
    }
}