histogram.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 Histogram extends JFrame implements ActionListener{
   static int[] count={0,0,0,0,0};
   static int m;
   static int sum=0;
    JButton jbExit;
    static String[] class1;
    static String[] name;
    static String[] score;
    static int icount=0;
    String[] line;
    public Histogram(String Class,String course){
       
      try{
           BufferedReader input =new BufferedReader(new FileReader("score.txt"));
           String L=input.readLine();
           double sc=0;
           String s3,s4;
         
          StringTokenizer scanner1=new StringTokenizer(L,"*"); 
          m=scanner1.countTokens();
          line=new String[m];
          class1=new String[m/7];
          name=new String[m/7];
          score=new String[m/7];
          for(int j=0;scanner1.hasMoreTokens();j++)
          {
              line[j]=scanner1.nextToken();
          }
           for(int j=0,n=1;j<m;j++,n++)
                     {
                         if(n==1){
                            
                             class1[icount]=line[j];
                             name[icount]=line[j+1];
                             score[icount]=line[j+4];
                             icount++; 
                         }
                         if(n==7){
                             n=0;
                         }
                     }
          StringTokenizer scanner3=new StringTokenizer(Class);
          StringTokenizer scanner4=new StringTokenizer(course);
          s3=scanner3.nextToken();
          s4=scanner4.nextToken();  
          for(int k=0;k<m/7;k++)
          {
              if((class1[k].equals(s3))&&(name[k].equals(s4)))
              {
               sc=Double.parseDouble(score[k]);
               if(sc<59&&sc>=0)
                   count[0]++;
               if(sc<69&&sc>=60)
                   count[1]++;
               if(sc<79&&sc>=70)
                   count[2]++;
               if(sc<89&&sc>=80)
                   count[3]++;
               if(sc<=100&&sc>=90)
                   count[4]++;
               sum++;
         }
      }           
           input.close();

      }
      catch(Exception es){
           sum=0;
            icount=0;
            m=0;
            for(int d=0;d<5;d++)
            count[d]=0;
          JOptionPane.showMessageDialog(null, "分析失败");
      }
      jbExit=new JButton("EXIT");
       JPanel jpExit=new JPanel();
       jpExit.add(jbExit);
       jbExit.addActionListener(this);
       getContentPane().add(new RectPanel(),BorderLayout.CENTER);
       getContentPane().add(jpExit,BorderLayout.SOUTH);
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setTitle("柱状图");
        this.setLocation(400,300);
        this.setSize(500,380);
        this.setVisible(true);
       
   }
class RectPanel extends JPanel{
    protected void paintComponent(Graphics g){
        int i=(getHeight()/9*8-getHeight()/8)/5;
        int j=(getWidth()/7*6)/10;
        super.paintComponent(g);
        g.setColor(Color.LIGHT_GRAY);
        g.fillRect(getWidth()/10,getHeight()/8,getWidth()/7*6,getHeight()/4*3); 
        g.setColor(Color.BLACK);
        g.drawString("人数", getWidth()/27,getHeight()/15);
        g.setColor(Color.BLACK);
        g.drawString("25", getWidth()/27,getHeight()/8);  
        g.setColor(Color.BLACK);
        g.drawString("20", getWidth()/27,getHeight()/8+i);
        g.setColor(Color.BLACK);
        g.drawString("15", getWidth()/27,getHeight()/8+2*i);
        g.setColor(Color.BLACK);
        g.drawString("10", getWidth()/27,getHeight()/8+3*i);
        g.setColor(Color.BLACK);
        g.drawString("5", getWidth()/25,getHeight()/8+4*i);
        g.setColor(Color.BLACK);
        g.drawString("0", getWidth()/25,getHeight()/9*8);
        g.setColor(Color.BLACK);
        g.drawString("<60分", getWidth()/50*7,getHeight()/16*15);
        g.setColor(Color.BLACK);
        g.drawString("60-69分", getWidth()/50*7+2*j,getHeight()/16*15);
        g.setColor(Color.BLACK);
        g.drawString("70-79分", getWidth()/50*7+4*j,getHeight()/16*15);
        g.setColor(Color.BLACK);
        g.drawString("80-89分",getWidth()/50*7+6*j,getHeight()/16*15);
        g.setColor(Color.BLACK);
        g.drawString(">=90分", getWidth()/50*7+8*j,getHeight()/16*15);
        g.setColor(Color.BLACK);
        g.fillRect(getWidth()/50*7,getHeight()/8+getHeight()/4*3*(250-count[0]*10)/250,j,getHeight()/4*3*count[0]*10/250);
        g.setColor(Color.BLACK);
        g.fillRect(getWidth()/50*7+2*j,getHeight()/8+getHeight()/4*3*(250-count[1]*10)/250,j,getHeight()/4*3*count[1]*10/250);
        g.setColor(Color.BLACK);
        g.fillRect(getWidth()/50*7+4*j,getHeight()/8+getHeight()/4*3*(250-count[2]*10)/250,j,getHeight()/4*3*count[2]*10/250);
        g.setColor(Color.BLACK);
        g.fillRect(getWidth()/50*7+6*j,getHeight()/8+getHeight()/4*3*(250-count[3]*10)/250,j,getHeight()/4*3*count[3]*10/250);
        g.setColor(Color.BLACK);
        g.fillRect(getWidth()/50*7+8*j,getHeight()/8+getHeight()/4*3*(250-count[4]*10)/250,j,getHeight()/4*3*count[4]*10/250);
        g.setColor(Color.BLACK);
       
    }
}
public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==jbExit){
            sum=0;
            icount=0;
            m=0;
       for(int d=0;d<5;d++)
            count[d]=0;
            this.setVisible(false);
        }
    }

}