紧急求救！1000分大奉送!!!!

Question

就是一个文本文件！问题非常简单，就是我不会java

Answer 1

这个txt用来放分数而已？还是连班级、姓名以及分数放在一起？

Answer 2

帮你改了一些东西，前面部分的功能保留，实现了统计部分的功能，你看看，代码如下：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class applet3 extends WindowAdapter  implements ActionListener
{
   int i=0;
   String str="";   Frame f;
   Button b1,b2,b3;
   TextArea ta,tb;
   FileDialog fd1;
   Font fo=new Font("",1,18);
   TextField t[]=new TextField[15];
   Panel p[]=new Panel[15];   public static void main(String args[])
   {
      applet3 that=new applet3();
      that.go();
   }
   public void go()
   {
      f=new Frame("金融班(200072)");
      b1=new Button("打开");
      b2=new Button("分数统计");
      b3=new Button("退出");
      ta=new TextArea("",0,0,3);
      tb=new TextArea("",0,0,3);
      fd1=new FileDialog(f,"打开",0);
       Font fo=new Font("Dialog",Font.BOLD,18);
       ta.setFont(fo);
      Panel p1=new Panel();
      Panel p2=new Panel();
      Panel p3=new Panel();
      Panel p4=new Panel();
      Panel p5=new Panel();
      f.setLayout(new GridLayout(1,3));
      f.add(p1);
      f.add(p2);
      f.add(p3);
      p1.setLayout(new BorderLayout());
      p1.add(b1,"North");
      p1.add(ta,"Center");
      p2.setLayout(new GridLayout(16,1));
      p2.add(new Label("分数"));
      for(i=0;i<15;i++)
      {
         p[i]=new Panel();
         t[i]=new TextField(3);
         p2.add(t[i]);
      }
      p3.setLayout(new BorderLayout());
      p3.add(b2,"North");
      p3.add(tb,"Center");      f.setBounds(100,100,370,300);
      f.setBackground(Color.green);
      f.addWindowListener(this);
      f.setVisible(true);       b1.addActionListener(this);
       b2.addActionListener(this);
       b3.addActionListener(this);
   }
   public void windowClosing(WindowEvent e)
   {
      System.exit(0);
   }
   public void actionPerformed(ActionEvent e)
   {
      int a1=0,a2=0,a4=0,a5=0,a3=0,a6=0;
          if(e.getSource()==b1)
                {
                        fd1.setVisible(true);
                        int b;
                        File f1=new File(fd1.getDirectory(),fd1.getFile());                        int a=(int)f1.length();
                        byte buffer[]=new byte[a];
                        try
                          {
                               FileInputStream rf=new FileInputStream(f1);
                               b=rf.read(buffer,0,a);
                               str=new String(buffer,0,b,"GB2312");
                          }
                        catch(IOException f)
                          {
                               str="文件读取错误";
                          }
                        ta.setText(str);
               }
          String s1="",s2="",s3="",s4="",s5="",s6="",s7="",s8="",s9="",s10="",
                 s11="",s12="",s13="",s14="",s15="";
          double    t1=0,t2=0,t3=0,t4=0,t5=0,t6=0,t7=0,t8=0,t9=0,t10=0,
                 t11=0,t12=0,t13=0,t14=0,t15=0,temp=0;
          int i=0,j=0;
          s1=t[0].getText();     s2=t[1].getText();
          s3=t[2].getText();     s4=t[3].getText();
          s5=t[4].getText();     s6=t[5].getText();
          s7=t[6].getText();     s8=t[7].getText();
          s9=t[8].getText();     s10=t[9].getText();
          s11=t[10].getText();     s12=t[11].getText();
          s13=t[12].getText();     s14=t[13].getText();
          s15=t[14].getText();
          try {
            t1 = Double.parseDouble(s1);
            t2 = Double.parseDouble(s2);
            t3 = Double.parseDouble(s3);
            t4 = Double.parseDouble(s4);
            t5 = Double.parseDouble(s5);
            t6 = Double.parseDouble(s6);
            t7 = Double.parseDouble(s7);
            t8 = Double.parseDouble(s8);
            t9 = Double.parseDouble(s9);
            t10 = Double.parseDouble(s10);
            t11 = Double.parseDouble(s11);
            t12 = Double.parseDouble(s12);
            t13 = Double.parseDouble(s13);
            t14 = Double.parseDouble(s14);
            t15 = Double.parseDouble(s15);
          } catch(Exception ex){JOptionPane.showMessageDialog(f,"十五个文本框必须填满，并且都必须输入数字！");return;}
          double f[]={t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11,t12,t13,t14,t15};
          for(i=0;i<15;i++)//冒泡排序，从高到低排列
          {
             for(j=i;j<15;j++)
             {
                if(f[i]<f[j])
                {
                     temp=f[i];
                     f[i]=f[j];
                     f[j]=temp;
                }
             }
          }
          for(i=0;i<15;i++)
          {
             if(f[i]<49)
             a1++;
             if(f[i]>=50&&f[i]<59)
             a2++;
             if(f[i]>=60&&f[i]<69)
             a3++;
             if(f[i]>=70&&f[i]<79)
             a4++;
             if(f[i]>=80&&f[i]<89)
             a5++;
             if(f[i]>=90)
             a6++;
          }          if(e.getSource()==b2)
          {
            java.text.DecimalFormat df=new java.text.DecimalFormat("#.##");
            String s="名次-----分数 \n";
            double scoreCount=0;
             for(int ii=0;ii<f.length;ii++) {
               scoreCount+=f[ii];
               s+=" "+(ii+1)+" ----- "+f[ii]+"\n";
             }
             s+="-------------\n分数统计：\n";
             s+="总分："+scoreCount;
             s+="\n平均分："+df.format(scoreCount/15);
             s+="\n-------------\n分数段统计：\n";
             s+="49分以下： "+a1+" 人\n";
             s+="50~~59分： "+a2+" 人\n";
             s+="60~~69分： "+a3+" 人\n";
             s+="70~~79分： "+a4+" 人\n";
             s+="80~~89分： "+a5+" 人\n";
             s+="90分以上： "+a6+" 人\n";
             this.tb.setText(s);
          }
   }
}