大佬们，后面学生成绩总结，排名哪里该从哪里入手

package com.test.demo;

import java.util.*;

public class StudentRecord {

    public static void main(String[] args){
        try {
            print("请输入学生人数：");
            Scanner stuNumSc = new Scanner(System.in);
            Integer stuNum = stuNumSc.nextInt();
            print("请输入科目数量：");
            Scanner subNumSc = new Scanner(System.in);
            Integer subNum = subNumSc.nextInt();
            Map<Student, List<Course>> studentRescords = new TreeMap<Student, List<Course>>(
                    new Comparator<Student>() {
                        public int compare(Student obj1, Student obj2) {
                            // 降序排序
                            return obj2.getTotalRecord().compareTo(obj1.getTotalRecord());
                        }
                    });
            List<Course> listCourse = new ArrayList<Course>(subNum);
            for(int i = 0;i<subNum;i++){
                print("请定义第"+(i+1)+"门课程的名字");
                Scanner subNameSc = new Scanner(System.in);
                Course c = new Course();
                c.setName(subNameSc.next());
                listCourse.add(c);
            }
            for(int i=0;i<stuNum;i++){
                print("请输入学生的姓名");
                Scanner stuNameSc = new Scanner(System.in);
                Student stu = new Student();
                stu.setName(stuNameSc.next());
                List<Course> courseLists = new ArrayList<Course>(subNum);
                for(int j=0;j<subNum;j++){
                    print("请输入学生"+stu.getName()+listCourse.get(j).getName()+"的成绩");
                    Scanner recordSc = new Scanner(System.in);
                    Double record = recordSc.nextDouble();
                    Course c = new Course();
                    c.setName(listCourse.get(j).getName());
                    c.setRecord(record);
                    courseLists.add(c);
                }
                Double totalRec = 0.00;
                for(int m = 0 ;m<subNum;m++){
                    totalRec= totalRec + courseLists.get(0).getRecord();
                }
                Double avgRec = totalRec/subNum;
                stu.setAvgRecord(avgRec);
                stu.setTotalRecord(totalRec);
                studentRescords.put(stu,courseLists);
            }
            StringBuffer sb = new StringBuffer();
            for(int i=0;i<listCourse.size();i++){
                sb.append("   ").append(listCourse.get(i).getName());
            }
            System.out.println("学生      "+sb.toString()+"      总分"+"        平均分"+"        排行榜");
            Set<Student> keySet = studentRescords.keySet();
            Iterator<Student> iter = keySet.iterator();
            int re = 1;
            while (iter.hasNext()) {
                Student key = iter.next();
                List<Course> lists = studentRescords.get(key);
                StringBuffer sbStu = new StringBuffer();
                for(int i=0;i<lists.size();i++){
                    sbStu.append("   ").append(lists.get(i).getRecord());
                }
                System.out.println(key.getName()+"        "+sbStu.toString()+"        "+key.getTotalRecord()+"        "+key.getAvgRecord()+"        第"+re+"名");
                re+=1;
            }

        }catch(Exception e){
            print("输入非法，即将退出");
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException e1) {
                e1.printStackTrace();
            }
            System.exit(0);
        }
    }

    static void print(String text){
        System.out.println(text);
    }



    static class Student{
        private String name;
        private Double totalRecord;
        private Double avgRecord;
        public void setName(String name){
            this.name = name;
        }

        public void setTotalRecord(Double totalRecord){
            this.totalRecord = totalRecord;
        }
        public void setAvgRecord(Double avgRecord){
            this.avgRecord = avgRecord;
        }
        public String getName(){
            return this.name;
        }
        public Double getTotalRecord(){
            return this.totalRecord;
        }

        public Double getAvgRecord(){
            return this.avgRecord;
        }

    }

    static  class Course{
        private String name;

        private Double record;

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

        public void setRecord(Double record){
            this.record = record;
        }

        public String getName(){
            return this.name;
        }
        public Double getRecord(){
            return record;
        }
    }
}

你可以将对应的数据进行倒序排序后，添加一个自增序列的字段就可以了。

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