Student类代码：
//定义一个Studnet类，该类包含“学号”，“姓名”，“数学成绩”，“语文成绩”，“外语成绩” 这几个数据字段。
public class Student {
    private String id;
    private String name;
    private String math;
    private String chinese;
    private String english;

    public Student(){}

    public Student(String id,String name,String math,String chinese,String english){

    }
    public void setId(String id){
        this.id=id;
    }
    public String getId(){
        return this.id;
    }

    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return this.name;
    }

    public void setMath(String math){
        this.math=math;
    }
    public String getMath() { return this.math;}

    public void setChinese(String chinese){
        this.chinese=chinese;
    }
    public String getChinese() { return this.chinese;}

    public void setEnglish(String english){
        this.english=english;
    }
    public String getEnglish() { return this.english;}

    public String toString() {
        return String.format("ID: %s, Name: %s, Math:%s, Chinese:%s, English:%s", this.getId(), this.getName(),this.getMath(),this.getChinese(),this.getEnglish());
    }
}


StudentManager类代码：
import java.io.*;
import java.nio.charset.Charset;
import java.io.FileInputStream;

public class StudentManager {
    public static void main(String[] args) throws IOException {
        StudentManager main = new StudentManager();

        String filePath1 = "C:\\students.txt";
        main.readStudentFromFile(filePath1);//学号和姓名

        String filePath2 = "C:\\math.txt";
        main.readmathFromFile(filePath2);//数学

        String filepath3 = "C:\\chinese.txt";
        main.readchineseFromFile(filepath3);//语文

        String filepath4 = "C:\\english.txt";
        main.readenglishFromFile(filepath4);//英语
    }

    public void readStudentFromFile(String filePath) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(filePath);
        InputStreamReader inputSteamreader = new InputStreamReader(fileInputStream, Charset.forName("UTF-8"));
        BufferedReader reader = new BufferedReader(inputSteamreader);

        String line = null;
        while ((line = reader.readLine()) != null) {
            if (line.trim().isEmpty()) continue;
            Student student = this.createStudent(line);
            System.out.println(student.toString());
        }
        fileInputStream.close();
    }

    private Student createStudent(String line) {
        String[] vals = line.split("\t");//拆分字符串
        Student student = new Student();
        student.setId(vals[0]);
        student.setName(vals[1]);
        return student;
    }
//读入数学成绩
    public void readmathFromFile(String filePath) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(filePath);
        InputStreamReader inputSteamreader = new InputStreamReader(fileInputStream, Charset.forName("UTF-8"));
        BufferedReader reader = new BufferedReader(inputSteamreader);

        String line = null;
        while ((line = reader.readLine()) != null) {
            if (line.trim().isEmpty()) continue;
            Student student = this.createmath(line);
            System.out.println(student.toString());
        }
        fileInputStream.close();
    }
    private Student createmath(String line) {
        String[] vals = line.split("\t");//拆分字符串
  //      Student student = new Student();
        student.setMath(vals[1]);
        return student;
    }
//读入语文成绩
    public void readchineseFromFile(String filePath) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(filePath);
        InputStreamReader inputSteamreader = new InputStreamReader(fileInputStream, Charset.forName("UTF-8"));
        BufferedReader reader = new BufferedReader(inputSteamreader);

        String line = null;
        while ((line = reader.readLine()) != null) {
            if (line.trim().isEmpty()) continue;
            Student student = this.createchinese(line);
            System.out.println(student.toString());
        }
        fileInputStream.close();
    }
    private Student createchinese(String line) {
        String[] vals = line.split("\t");//拆分字符串
        Student student = new Student();
        student.setChinese(vals[1]);
        return student;
    }
//读入英语成绩
    public void readenglishFromFile(String filePath) throws IOException {
        FileInputStream fileInputStream = new FileInputStream(filePath);
        InputStreamReader inputSteamreader = new InputStreamReader(fileInputStream, Charset.forName("UTF-8"));
        BufferedReader reader = new BufferedReader(inputSteamreader);

        String line = null;
        while ((line = reader.readLine()) != null) {
            if (line.trim().isEmpty()) continue;
            Student student = this.createenglish(line);
            System.out.println(student.toString());
        }
        fileInputStream.close();
    }
    private Student createenglish(String line) {
        String[] vals = line.split("\t");//拆分字符串
        Student student = new Student();
        student.setEnglish(vals[1]);
        return student;
    }
}