从键盘上获取名字、语文、数学的成绩,计算总分然后填充到Student对象中,并将对象写入文件

下面是源文件
Students.java文件

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Students implements Serializable {
  String name;
  int[] record = new int[4];
  int total;
  float avg;
  String grade;

  public Students() {
  }

  public String getName() {
    return name;
  }

  public int[] getRecord() {
    return record;
  }

  public int getTotal() {
    int s = 0;
    for (int i = 0; i < record.length; i++)
      s += record[i];
    return s;
  }

  public float getAvg() {
    float f = getTotal() / 4f;
    return f;
  }

  public String getGrade() {
    String str;
    if (avg < 100 && avg > 90)
      str = "A";
    else if (avg > 80)
      str = "B";
    else if (avg > 70)
      str = "C";
    else if (avg > 60)
      str = "D";
    else
      str = "F";
    return str;
  }
}

Students1.java文件

package test1;

import java.io.*;

public class Students1 {
  public static int s = 0;

  /** Creates a new instance of Students1 */
  public Students1() {
  }

  public static void main(String[] args) throws Exception {
    InputStreamReader isr = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(isr);
    System.out.println("请顺序输入名字及国语,英语,数学,科学的成绩.(eof:输入完毕)");
    String data;
    String[] str = new String[5];
    FileOutputStream fos = new FileOutputStream("C:\\Documents and Settings\\tliu\\桌面\\新建文件夹\\xi.txt");
    ObjectOutputStream oos = new ObjectOutputStream(fos);
    while (true) {
      data = br.readLine();
      s++;
      if (data.equals("eof"))
        break;
      str = data.split(" ");
      Students stu = new Students();
      stu.name = str[0];
      System.out.println(stu.name);
      stu.record[0] = Integer.parseInt(str[1]);
      System.out.println(stu.record[0]);
      stu.record[1] = Integer.parseInt(str[2]);
      stu.record[2] = Integer.parseInt(str[3]);
      stu.record[3] = Integer.parseInt(str[4]);
      stu.total = stu.getTotal();
      stu.avg = stu.getAvg();
      stu.grade = stu.getGrade();
      oos.writeObject(stu);
    }
    oos.close();
    System.out.println("文件内容");
    FileInputStream fis = new FileInputStream("D:\\xi.txt");
    ObjectInputStream ois = new ObjectInputStream(fis);
    for (int j = 1; j < s; j++) {
      Students stud;
      stud = (Students) ois.readObject();
      System.out.println("Students对象" + j + " " + "{" + stud.name + " " + stud.record[0] + " " + stud.record[1] + " "
          + stud.record[2] + " " + stud.record[3] + " " + stud.total + " " + stud.avg + " " + stud.grade + "}");
    }
    ois.close();
  }
}

class Students2 {
  public Students2() {
  }

  public static void main(String[] args) throws Exception {
    // TODO code application logic here
    int d = Students1.s;
    int[] a = new int[d];
    FileInputStream fis = new FileInputStream("C:\\Documents and Settings\\tliu\\桌面\\新建文件夹\\xi.txt");
    ObjectInputStream ois = new ObjectInputStream(fis);
    Students[] students = new Students[d];
    for (int i = 1; i < d; i++) {
      students[i] = (Students) ois.readObject();
    }
    ois.close();
    System.out.println("名字   " + "国语  " + "英语  " + "数学  " + "科学  " + "总分  " + "平均分  " + "学分  " + "顺序");
    for (int i = 1; i < d; i++) {
      int max = i;
      for (int j = i; j < d; j++) {
        if (students[j].avg > students[i].avg)
          max = j;
      }
      System.out.println(students[max].name + "   " + students[max].record[0] + "  " + students[max].record[1] + "  "
          + students[max].record[2] + "  " + students[max].record[3] + "  " + students[max].total + "  " + students[max].avg
          + "  " + students[max].grade + "  " + i);
    }
  }
}