用Java设计一个学生成绩管理系统，通过该系统可以实现如下功能; (1)录入功能:可以录入学生信息，学生信息包括学号、姓名、3门课程(数据结构、网 页开发基础、英语)成绩 (10分) (2)按平均成绩排序功能:计算出每个学生的平均成绩，按照学生平均成绩由高到低排序。 (15分) (1)按学号排序功能:按照学生的学号进行排序。 (10分) (1)统计功能:统计出平均分最高的学生、不及格学生信息及人数、平均分在80分以上 的学生信息及人数。 (15分) (2)查找功能:指定学号，从学生信息表中找到该学生

好的，以下是一个基于Java的学生成绩管理系统的设计和实现，可以实现录入、排序、统计和查找功能：

import java.util.*;

public class StudentManagementSystem {
    private List<Student> students;
    
    public StudentManagementSystem() {
        students = new ArrayList<Student>();
    }
    
    public void addStudent(Student student) {
        students.add(student);
    }
    
    public void sortByAverageScore() {
        Collections.sort(students, new Comparator<Student>() {
            public int compare(Student s1, Student s2) {
                return Double.compare(s2.getAverageScore(), s1.getAverageScore());
            }
        });
    }
    
    public void sortByStudentId() {
        Collections.sort(students, new Comparator<Student>() {
            public int compare(Student s1, Student s2) {
                return s1.getStudentId().compareTo(s2.getStudentId());
            }
        });
    }
    
    public void printHighestAverageScore() {
        double highestScore = 0;
        List<Student> highestScorers = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getAverageScore() > highestScore) {
                highestScore = student.getAverageScore();
                highestScorers.clear();
                highestScorers.add(student);
            } else if (student.getAverageScore() == highestScore) {
                highestScorers.add(student);
            }
        }
        System.out.println("Highest average score: " + highestScore);
        System.out.println("Highest scorers: " + highestScorers);
    }
    
    public void printFailingStudents() {
        List<Student> failingStudents = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getAverageScore() < 60) {
                failingStudents.add(student);
            }
        }
        System.out.println("Failing student count: " + failingStudents.size());
        System.out.println("Failing students: " + failingStudents);
    }
    
    public void printHighScoringStudents() {
        List<Student> highScoringStudents = new ArrayList<Student>();
        for (Student student : students) {
            if (student.getAverageScore() >= 80) {
                highScoringStudents.add(student);
            }
        }
        System.out.println("High-scoring student count: " + highScoringStudents.size());
        System.out.println("High-scoring students: " + highScoringStudents);
    }
    
    public Student findStudentById(String id) {
        for (Student student : students) {
            if (student.getStudentId().equals(id)) {
                return student;
            }
        }
        return null;
    }
}

public class Student {
    private String studentId;
    private String name;
    private int dataStructureScore;
    private int webDevelopmentScore;
    private int englishScore;
    
    public Student(String id, String name, int dataStructureScore, int webDevelopmentScore, int englishScore) {
        this.studentId = id;
        this.name = name;
        this.dataStructureScore = dataStructureScore;
        this.webDevelopmentScore = webDevelopmentScore;
        this.englishScore = englishScore;
    }
    
    public String getStudentId() {
        return studentId;
    }
    
    public String getName() {
        return name;
    }
    
    public int getDataStructureScore() {
        return dataStructureScore;
    }
    
    public int getWebDevelopmentScore() {
        return webDevelopmentScore;
    }
    
    public int getEnglishScore() {
        return englishScore;
    }
    
    public double getAverageScore() {
        return (dataStructureScore + webDevelopmentScore + englishScore) / 3.0;
    }
    
    public String toString() {
        return name + " (" + studentId + "): " + getAverageScore();
    }
}

以上代码中，定义了一个学生管理系统的类StudentManagementSystem和一个学生类Student。学生管理系统包括添加学生、按平均成绩排序、按学号排序、打印平均分最高的学生、打印不及格学生和打印平均分在80分以上的学生等功能，而学生类则包括学号、姓名和三门课程成绩等字段。可以通过调用这些方法来实现对学生信息的管理和查询。

以上代码仅作为示例，实际开发中还需要根据具体情况进行修改和完善。