scoreanalyse.java

学生成绩管理系统：能输入学科

package 学生考试成绩分析程序;

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

public class ScoreAnalyse extends JFrame implements ActionListener
{
    JLabel jlHigh,jlLow,jlAverage;
    JTextField jtHigh,jtLow,jtAverage;
    JButton jbExit;
    static double scoreH=-1,scoreL=111,sum=0;
    static int m,n,count=0;
    static String[] line;
    static String[] class1;
    static String[] scourse;
    static String[] score;
    
    public ScoreAnalyse(String scoreh,String scorel,String scorea)
    {
        jlHigh=new JLabel("最高分");
        jlLow=new JLabel("最低分");
        jlAverage=new JLabel("平均分");
        jtHigh=new JTextField(scoreh);
        jtLow=new JTextField(scorel);
        jtAverage=new JTextField(scorea);
        jbExit=new JButton("退出");
        
        JPanel jpanel1=new JPanel();
        JPanel jpanel2=new JPanel();
        jpanel1.setLayout(new GridLayout(0,4));
        jpanel1.add(jlHigh);
        jpanel1.add(jtHigh);
        jpanel1.add(jlLow);
        jpanel1.add(jtLow);
        jpanel1.add(jlAverage);
        jpanel1.add(jtAverage);
        jpanel2.add(jbExit);
        jbExit.addActionListener(this);
        
        getContentPane().add(jpanel1,BorderLayout.CENTER);
        getContentPane().add(jpanel2,BorderLayout.SOUTH);
        
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setTitle("分数分析");
        this.setLocation(450,300);
        this.setSize(350,150);
        this.setVisible(true);
        count=0;    
        scoreH=-1;
        scoreL=111;
        sum=0;
        m=0;
        n=0;
    }
    
    public ScoreAnalyse(String Class,String course)
    {
  try{ 
      BufferedReader input =new BufferedReader(new FileReader("score.txt"));
     double sc;
     String L=input.readLine();
     StringTokenizer tokenizer=new StringTokenizer(L,"*");
     m=tokenizer.countTokens();
     line=new String[m];
     class1=new String[m/7];
     scourse=new String[m/7];
     score=new String[m/7];
     for(int i=0;tokenizer.hasMoreTokens();i++)
     {
         line[i]=tokenizer.nextToken();
     }
    for(int j=0,k=1;j<m;j++,k++)
                     {
                         if(k==1){
                             class1[n]=line[j];
                             scourse[n]=line[j+1];
                             score[n]=line[j+4];
                             n++;  
                         }
                         if(k==7){
                             k=0;
                         }
                     }
          String s1,s2;
          StringTokenizer scanner1=new StringTokenizer(Class);
          StringTokenizer scanner2=new StringTokenizer(course);
          s1=scanner1.nextToken();
          s2=scanner2.nextToken(); 
          for(int j=0;j<m/7;j++)
          {
              if(class1[j].equals(s1)&&(scourse[j].equals(s2)))
              { 
                  sc=Double.parseDouble(score[j]);
                  if(sc>scoreH)
                      scoreH=sc;
                  if(sc<scoreL)
                      scoreL=sc;
                      sum=sum+sc;
                  count++;
              }
          }
          input.close();
  }
     
  catch(Exception e)
  {
       JOptionPane.showMessageDialog(null, "分析失败");
  }
      String sH= String.valueOf(scoreH) ;
      String sL= String.valueOf(scoreL) ;
      String sA= String.valueOf((int)(100*sum/count)/100.0) ;
        new ScoreAnalyse(sH,sL,sA);
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==jbExit){
             scoreH=-1;
             scoreL=111;
             sum=0;
             m=0;
             n=0;
            this.setVisible(false);
        }
    }

}