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控制类（主类）：Manage

import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;import java.util.Scanner;public class Manage{
   	static List
   
     studentList=new ArrayList<>();	static List
    
      allscores=new ArrayList<>();	 static Scanner in=new Scanner(System.in);	public static void main(String[] args) {
   		int ty = 10;	 while(ty!=0) {
   		 System.out.println("1.添加学生");		 System.out.println("2.删除学生");		 System.out.println("3.修改学生");		 System.out.println("4.查看学生");		 System.out.println("5.增加学生课程学习记录");		 System.out.println("6.查看所有学生信息（排序）");		 System.out.println("7.平均分、最高分、最低分");		 System.out.println("8.成绩单");		 System.out.println("0.退出系统");		 ty=in.nextInt();		 switch(ty) {
   		 case 1: addStudent();		 		 break;		 case 2: remove();		 		 break;		 case 3:fix();		 		 break;		 case 4:find();		 		 break;		 case 5:addscore();		 		 break;		 case 6:sort();		 		 break;		 case 7:printscore();		 		break;		 case 8:findall();		         break;		 case 0:break;		 default:System.out.println("请重新输入");		 }	 }	 System.out.println("系统退出成功！");	}		public static void addStudent() {
   		Student student=new Student();		System.out.println("请输入名字：");		student.getname(in.next());		System.out.println("请输入学号：");		student.getnum(in.nextInt());		studentList.add(student);		studentList.get(studentList.size()-1).studentScores.add(new Score());		System.out.println("添加成功！");	}	public static void addscore() {
   		System.out.println("请输入要增加课程成绩记录学生学号：");		int p=in.nextInt();		int t=0;		for (int i = 0; i < studentList.size(); i++) {
   			if (p==studentList.get(i).tonum()) {
   				studentList.get(i).studentScores.add(new Score());				System.out.println("添加课程成绩成功");				t=1;			}				}		if (t==0) {
   			System.out.println("没有找到学号为："+p+"学生");		}	}			public static void remove() {
   		System.out.println("请输入要删除学生的学号：");		int p=in.nextInt();		int t=0;		for (int i = 0; i < studentList.size(); i++) {
   			if (p==studentList.get(i).tonum()) {
   				studentList.remove(i);				t=1;			}				}		if (t==0) {
   			System.out.println("没有找到学号为："+p+"学生");		}	}	public static void fix() {
   		System.out.println("请输入要修改信息的学生学号：");		int p=in.nextInt();		int t=0;		int t1=0;		String scString;		for (int i = 0; i < studentList.size(); i++) {
   			if (p==studentList.get(i).tonum()) {
   				System.out.println("请输入要修改课程(全称)：");				scString=in.next();				for (int j = 0; j < studentList.get(i).studentScores.size(); j++) {
   					if (scString.equals(studentList.get(i).studentScores.get(j).course)) {
   //scString==(studentList.get(i).studentScores.get(j).course恶意出错						System.out.println("请输入要修改此门课："+scString+"的成绩：");						studentList.get(i).studentScores.get(j).score=in.nextInt();						t1=1;					}				}				if (t1==0) {
   					System.out.println("没有找到课程为："+scString+"的课程");				}				t=1;			}				}		if (t==0) {
   			System.out.println("没有找到学号为："+p+"学生");		}	}	public static void find() {
   		System.out.println("请输入要查找信息的学生学号：");		int p=in.nextInt();		int t=0;		for (int i = 0; i < studentList.size(); i++) {
   			if (p==studentList.get(i).tonum()) {
   				System.out.println("该生信息如下：");				System.out.println("学号："+studentList.get(i).tonum());				System.out.println("姓名："+studentList.get(i).toname());				for (int j = 0; j < studentList.get(i).studentScores.size(); j++) {
   					System.out.println("课程："+studentList.get(i).studentScores.get(j).course);					System.out.println("成绩："+studentList.get(i).studentScores.get(j).score);				}								t=1;			}				}		if (t==0) {
   			System.out.println("没有找到学号为："+p+"学生");		}			}	public static void sort() {
   	for (int i = 0; i < studentList.size(); i++) {
   	Collections.sort(studentList.get(i).studentScores,new Comparator
     
      () {
   		@Override		public int compare(Score o1, Score o2) {
   			// TODO 自动生成的方法存根			return -o1.score+o2.score;		}	});	}			findall();		}	public static void findall() {
   		for (int i = 0; i < studentList.size(); i++) {
   			System.out.println("学号："+studentList.get(i).num+" "+"姓名："+studentList.get(i).name);			for (int j = 0; j < studentList.get(i).studentScores.size(); j++) {
   				System.out.println("课程："+studentList.get(i).studentScores.get(j).course+" "+"成绩："+studentList.get(i).studentScores.get(j).score);			}					}	}	public static void printscore() {
   		System.out.println(allscores.size());		for (int i = 0; i < allscores.size(); i++) {
   			System.out.println("课程："+allscores.get(i).course+" "+"人数："+allscores.get(i).pepnumsum+" "+"总分："+allscores.get(i).scoresum+" "+"平均分："+allscores.get(i).scoresum/allscores.get(i).pepnumsum+" "+"最高分："+allscores.get(i).heightest+" "+"最低分："+allscores.get(i).lowest);		}	}}```> 学生类：Student```javaimport java.util.ArrayList;import java.util.List;public class Student {
   	public String name;	public int num;	public List
      
        studentScores=new ArrayList<>();	public void getname(String name) {
   		this.name=name;	}	public void getnum(int num) {
   		this.num=num;	}	public String toname() {
   		return name;	}	public int tonum() {
   		return num;	}}
      
     
    
   

添加成绩记录类：Score

import java.util.Scanner;public class Score extends Manage{
   	public String course;	public int score;	Score() {
   		Scanner scannerin=new Scanner(System.in);		System.out.println("请输入要添加的课程：");		this.course=scannerin.next();		System.out.println("请输入此门课程的成绩：");		this.score=scannerin.nextInt();		Allscore h=new Allscore(this.course, this.score);		if (h.p==1) {
   			allscores.add(h);		}	}	}

统计平均分，最高分，最低分类：Allscore

public class Allscore extends Manage{
   	public String course;	public int scoresum;	public int pepnumsum;	public int heightest;	public int lowest;	public int p=1;	public Allscore(String course, int score) {
   				for (int i = 0; i < allscores.size(); i++) {
   			if (course.equals(allscores.get(i).course)) {
   				allscores.get(i).scoresum+=score;				allscores.get(i).pepnumsum+=1;				if (allscores.get(i).heightest
   
    score) {
   					allscores.get(i).lowest=score;				}				p=0;			}		}		if (p==1) {
   			this.course=course;			this.scoresum=score;			this.heightest=score;			this.lowest=score;			this.pepnumsum=1;		}	}}
   

之后我会实现一个界面版，敬请期待

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