学生成绩和平均成绩保存文件中的练习

 

 

import java.io.*;
import java.lang.*;
import java.util.*;

public class RecordScore {


    private String readline;
    private BufferedReader br;
    private BufferedWriter bw;
    private BufferedWriter bw2;
    private String [] str;
    private int score=0;
    private Stack<String> ta;


    static {

        System.out.println("输入成绩的格式为 姓名 成绩 ,例如:\n 张三 80 \n 李四 90\n 王五 70\n 请输入:\n");



    }


    RecordScore() {

        br=new BufferedReader(new InputStreamReader(System.in));
        bw=new BufferedWriter(new OutputStreamWriter(System.out));


       try {

           ta=new Stack<String>();
           bw2=new BufferedWriter(new FileWriter(new File("D:\\myRead\\score.txt")));


       }catch (Exception e) {

           e.getMessage();
       }

    }

    private void setRecordScore() throws Exception {

        while ((readline=br.readLine())!=null) {


            if (readline.equals("end")) {

                break;

            }


            str=readline.split(" "); //字符串按照空格拆分成数组

             try  {


                 if(Integer.parseInt(str[1])<0||Integer.parseInt(str[1])>100) { // 输入的分数有异常的情况,超出分数范围的情况。

                     System.out.println("输入的分数有异常，请从新输入！");

                 }

             }catch (ArrayIndexOutOfBoundsException e) {

                 e.getMessage();
                 System.out.println("没有空格");
             }


            for(String s:str) {

                ta.push(s);

            }

            score=score+Integer.parseInt(ta.pop());//累加分数,利用Stack后进先出的特性

              bw.write(readline);
              bw.newLine();
              bw.flush();
              bw2.write(readline);
              bw2.newLine();
              bw2.flush();
        }

        System.out.println("总分:"+score);


        bw.close();
        bw2.close();
    }

    public static void main(String[] args) throws Exception {

         RecordScore rs=new RecordScore();

         rs.setRecordScore();

    }
}