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<Student> studentList=new ArrayList<>();
static List<Allscore> 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<Score>() {
@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
```java
import java.util.ArrayList;
import java.util.List;
public class Student {
public String name;
public int num;
public List<Score> 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).heightest=score;
}
if (allscores.get(i).lowest>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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