gradeanalyse.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.StringTokenizer;

public class GradeAnalyse extends JFrame implements ActionListener{        
        JLabel jlClass,jlCourse;
        JButton jbExit,jbScoreAnalyse,jbScoreSect,jbGraphics;
        static  String Class,course;
        JComboBox jc;
        String[] s;
        String[] c;
        static  int ccount=0,count2=0;
        JComboBox jc2;
        String[] s2;
        String[] c2;
        int m,m2;
        Object[] O2;
    public GradeAnalyse(){

        
        jlClass=new JLabel("      班级        ");
        jlCourse=new JLabel("     课程      ");
        jbScoreAnalyse=new JButton("分数分析");
        jbScoreSect=new JButton("分数段分析");
        jbGraphics=new JButton("图形分析");
        jbExit=new JButton("退出");
        
        JPanel jpanel1=new JPanel();
        JPanel jpanel2=new JPanel();
        JPanel jpanel3=new JPanel();
        
         try{
               BufferedReader output=new   BufferedReader(new FileReader("course.txt")); 
               String line=output.readLine();
               StringTokenizer ss=new StringTokenizer(line,"*");
                m=ss.countTokens();
               
               s=new String[m];
               c=new String[m/4];
              
               for(int i=0;ss.hasMoreTokens();i++){
                   s[i]=ss.nextToken();
               }
               for(int j=0,k=1;j<m;j++,k++){
                   if(k==2){
                      
                       c[ccount]=s[j];   
                       ccount++;
                       
                   }
                   if(k==4)
                       k=0;
                }
                 
               Object[] O=new Object[m/4];
               for(int i=0;i<m/4;i++)
                   O[i]=c[i];
               jc=new JComboBox(O);
               output.close();
          }
         catch(Exception e)
         {
             ccount=0;
             count2=0;
             JOptionPane.showMessageDialog(null, "分析失败");
         }
        
        try{
               BufferedReader output2=new   BufferedReader(new FileReader("student.txt")); 
               String line2=output2.readLine();
               StringTokenizer ss2=new StringTokenizer(line2,"*");
                m2=ss2.countTokens();
               
               s2=new String[m2];
               c2=new String[m2];
              
               for(int i=0;ss2.hasMoreTokens();i++){
                   s2[i]=ss2.nextToken();
               }
               c2[0]=s2[0]+s2[1]+s2[2];
               for(int j=0,k=1;j<m2;j++,k++){
                   if(k==3){
                      if(!c2[count2].equals(s2[j-2]+s2[j-1]+s2[j])){
                       c2[++count2]=s2[j-2]+s2[j-1]+s2[j];   
                      }
                   }
                   if(k==6)
                       k=0;
                }
               O2=new Object[++count2];
               for(int i=0;i<count2;i++){
                   O2[i]=c2[i];
               }
               jc2=new JComboBox(O2);
               count2=0;
               output2.close();
          }
         catch(Exception eg)
         {
             ccount=0;
             count2=0;
             JOptionPane.showMessageDialog(null, "分析失败");
         }
        
        
        jpanel1.add(jlClass);
        jpanel1.add(jc2);
        jpanel1.add(jlCourse);
        jpanel1.add(jc);
        jpanel2.add(jbScoreAnalyse);
        jpanel2.add(jbScoreSect);
        jpanel2.add(jbGraphics);
        jpanel3.add(jbExit);

        
        jbExit.addActionListener(this);
        jbScoreAnalyse.addActionListener(this);
        jbScoreSect.addActionListener(this);
        jbGraphics.addActionListener(this);
        getContentPane().add(jpanel1,BorderLayout.NORTH); 
        getContentPane().add(jpanel2,BorderLayout.CENTER); 
        getContentPane().add(jpanel3,BorderLayout.SOUTH);  
        
        
        

                
    }

    public void actionPerformed(ActionEvent e)
    {
         if(e.getSource()==jbScoreAnalyse){
           Class=jc2.getSelectedItem().toString();
           course=jc.getSelectedItem().toString();
           ccount=0;
           count2=0;
            new ScoreAnalyse(Class,course);
        }
         else if(e.getSource()==jbScoreSect){
              Class=jc2.getSelectedItem().toString();
              course=jc.getSelectedItem().toString();
               ccount=0;
               count2=0;
              new ScoreSect(Class,course);
        }
         else if(e.getSource()==jbGraphics){
             Class=jc2.getSelectedItem().toString();
             course=jc.getSelectedItem().toString();
              ccount=0;
              count2=0;
            new GraphicsAnalyse(Class,course);
           
        }
         else if(e.getSource()==jbExit){
              ccount=0;
              count2=0;
            this.setVisible(false);
        }
    }
 
}