用java设计一个用于统计一个班学生成绩的程序，需要完成以下功能： 1）输入学生成绩信息 2）按总平均成绩排序 3）按学号排序 4）输出学生成绩表 5）结束退出 根据以上描述，编写程序输出功能菜单，输入菜单选择，根据选择执行对应功能，每个功能只显示该功能名称，例如选2，则输出：“现在执行按总平均成绩排序功能！”

好的，以下是Java代码实现：

import java.util.*;

public class Main {
    static Scanner scanner = new Scanner(System.in);
    static List<Student> students = new ArrayList<>();

    public static void main(String[] args) {
        while (true) {
            System.out.println("请选择功能：");
            System.out.println("1. 输入学生成绩信息");
            System.out.println("2. 按总平均成绩排序");
            System.out.println("3. 按学号排序");
            System.out.println("4. 输出学生成绩表");
            System.out.println("5. 结束退出");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    inputStudents();
                    break;
                case 2:
                    sortByAverageScore();
                    break;
                case 3:
                    sortById();
                    break;
                case 4:
                    printStudents();
                    break;
                case 5:
                    System.exit(0);
                default:
                    System.out.println("输入不正确，请重新输入！");
                    break;
            }
        }
    }

    private static void inputStudents() {
        System.out.println("请输入学生数：");
        int count = scanner.nextInt();

        for (int i = 0; i < count; i++) {
            System.out.println("请输入第" + (i + 1) + "个学生的信息：");
            System.out.println("学号：");
            int id = scanner.nextInt();
            System.out.println("姓名：");
            String name = scanner.next();
            System.out.println("语文成绩：");
            int chineseScore = scanner.nextInt();
            System.out.println("数学成绩：");
            int mathScore = scanner.nextInt();
            System.out.println("英语成绩：");
            int englishScore = scanner.nextInt();

            Student student = new Student(id, name, chineseScore, mathScore, englishScore);
            students.add(student);
        }
    }

    private static void sortByAverageScore() {
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                return Double.compare(o2.getAverageScore(), o1.getAverageScore());
            }
        });
        System.out.println("现在执行按总平均成绩排序功能！");
    }

    private static void sortById() {
        Collections.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
                return Integer.compare(o1.getId(), o2.getId());
            }
        });
        System.out.println("现在执行按学号排序功能！");
    }

    private static void printStudents() {
        if (students.size() == 0) {
            System.out.println("还没有输入学生信息！");
            return;
        }
        System.out.println("学号\t姓名\t语文\t数学\t英语\t总分\t平均分");
        for (Student student : students) {
            System.out.println(student);
        }
    }
}

class Student {
    private int id;
    private String name;
    private int chineseScore;
    private int mathScore;
    private int englishScore;

    public Student(int id, String name, int chineseScore, int mathScore, int englishScore) {
        this.id = id;
        this.name = name;
        this.chineseScore = chineseScore;
        this.mathScore = mathScore;
        this.englishScore = englishScore;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public int getChineseScore() {
        return chineseScore;
    }

    public int getMathScore() {
        return mathScore;
    }

    public int getEnglishScore() {
        return englishScore;
    }

    public int getTotalScore() {
        return chineseScore + mathScore + englishScore;
    }

    public double getAverageScore() {
        return getTotalScore() / 3.0;
    }

    @Override
    public String toString() {
        return id + "\t" + name + "\t" + chineseScore + "\t" + mathScore + "\t" + englishScore
                + "\t" + getTotalScore() + "\t" + String.format("%.2f", getAverageScore());
    }
}

你可以将以上代码保存为 `Main.java` 文件，并在命令行中编译并运行。