为什么不进行排序啊，能改下吗？

Question

按照总分，学号，姓名的代码未进行排序，怎么改，用冒泡排序。能在代码上改一下吗。

Answer 1

j和j+1交换不是和i交换

import java.util.Scanner;
public class Student {
    private String name;
    private String stuId;
    private int[] scores;
    private double avgScore;

    public Student(String name, String stuId, int[] scores) {
        this.name = name;
        this.stuId = stuId;
        this.scores = scores;
        double totalScore = 0;
        for (int score : scores) {
            totalScore += score;
        }
        this.avgScore = totalScore / scores.length;
    }

    public String getName() {
        return name;
    }

    public String getStuId() {
        return stuId;
    }

    public int[] getScores() {
        return scores;
    }

    public double getAvgScore() {
        return avgScore;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入学生的个数：");
        int n = scanner.nextInt();
        scanner.nextLine();

        Student[] students = new Student[n];
        for (int i = 0; i < n; i++) {
            System.out.print("请输入第" + (i+1) + "个学生的名字：");
            String name = scanner.nextLine();

            System.out.print("请输入第" + (i+1) + "个学生的学号：");
            String stuId = scanner.nextLine();

            System.out.print("请输入第" + (i+1) + "个学生的成绩（以空格分隔）：");
            String[] scoreStrArr = scanner.nextLine().split(" ");
            int[] scores = new int[scoreStrArr.length];
            for (int j = 0; j < scores.length; j++) {
                scores[j] = Integer.parseInt(scoreStrArr[j]);
            }

            students[i] = new Student(name, stuId, scores);
        }

        // 计算每门学科的平均成绩
        double[] subjectAvgScores = new double[students[0].getScores().length];
        for (int i = 0; i < subjectAvgScores.length; i++) {
            double totalScore = 0;
            for (Student student : students) {
                totalScore += student.getScores()[i];
            }
            subjectAvgScores[i] = totalScore / n;
        }
        System.out.println("每门学科的平均成绩为：");
        for (int i = 0; i < subjectAvgScores.length; i++) {
            System.out.print(subjectAvgScores[i] + " ");
        }
        System.out.println();

        // 计算每位同学的平均成绩，并按学号由大到小排序
        System.out.println("按学号由大到小排序的每位同学的平均成绩为：");
        for (int i = 0; i < students.length; i++) {
            for (int j = 0; j < students.length-i-1; j++) {
                if (students[j].getStuId().compareTo(students[j+1].getStuId()) < 0) {
                    Student temp = students[j];
                    students[j] = students[j+1];
                    students[j+1] = temp;
                }
            }
        }
        for (Student student : students) {
            System.out.println(student.getName() + " " + student.getStuId() + " " + student.getAvgScore());
        }

        // 按总成绩由大到小排序
        System.out.println("按总成绩由大到小排序的所有学生信息为：");
        for (int i = 0; i < students.length; i++) {
            for (int j = 0; j < students.length-i-1; j++) {
                double score1 = 0;
                for (int k = 0; k < students[j].getScores().length; k++) {
                    score1 += students[j].getScores()[k];
                }
                double score2 = 0;
                for (int k = 0; k < students[j+1].getScores().length; k++) {
                    score2 += students[j+1].getScores()[k];
                }
                if (score1 < score2) {
                    Student temp = students[j];
                    students[j] = students[j+1];
                    students[j+1] = temp;
                }
            }
        }
        for (Student student : students) {
            System.out.println(student.getName() + " " + student.getStuId() + " " + student.getAvgScore());
        }
    }
}