利用java语言实现 3-5编写 一个学生类student,包含的属性有学号、姓名、性别、年龄等,将所有学生存储在一一个数组中,编写学生管理程序实现如下操作: (1)增加一个学生; (2)根据学号删除某个学生; (3)将所有学生年龄增加一岁; (4)按数组中顺序显示所有学生信息; (5)将所有学生按姓名排序输出。

public class Student implements Comparable<Student> {
    private String id; // 学号
    private String name; // 姓名
    private String gender; // 性别
    private int age; // 年龄

    public Student(String id, String name, String gender, int age) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    //年龄增加一岁
    public void increaseAge() {
        this.age++;
    }

    //按照姓名排序
    @Override
    public int compareTo(Student o) {
        return this.name.compareTo(o.getName());
    }

    @Override
    public String toString() {
        return "Student{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                '}';
    }
}

import java.util.Arrays;
import java.util.Scanner;

public class StudentManager {
    private Student[] students; // 存储学生的数组
    private int size; // 学生数量

    public StudentManager(int capacity) {
        students = new Student[capacity];
        size = 0;
    }

    // 增加一个学生
    public void addStudent(Student student) {
        if (size < students.length) {
            students[size++] = student;
            System.out.println("增加成功！");
        } else {
            System.out.println("数组已满，增加失败！");
        }
    }

    // 根据学号删除某个学生
    public void deleteStudentById(String id) {
        for (int i = 0; i < size; i++) {
            if (students[i].getId().equals(id)) {
                for (int j = i; j < size - 1; j++) {
                    students[j] = students[j + 1];
                }
                students[--size] = null;
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("没有找到该学号的学生，删除失败！");
    }

    // 将所有学生年龄增加一岁
    public void increaseAge() {
        for (int i = 0; i < size; i++) {
            students[i].increaseAge();
        }
        System.out.println("年龄增加成功！");
    }

    // 按数组中顺序显示所有学生信息
    public void showAllStudents() {
        System.out.println("学生信息如下：");
        for (int i = 0; i < size; i++) {
            System.out.println(students[i]);
        }
    }

    // 将所有学生按姓名排序输出
    public void sortByName() {
        Arrays.sort(students, 0, size);
        System.out.println("按姓名排序后的学生信息如下：");
        for (int i = 0; i < size; i++) {
            System.out.println(students[i]);
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StudentManager studentManager = new StudentManager(5);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1.增加一个学生");
            System.out.println("2.根据学号删除某个学生");
            System.out.println("3.将所有学生年龄增加一岁");
            System.out.println("4.按数组中顺序显示所有学生信息");
            System.out.println("5.将所有学生按姓名排序输出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    System.out.println("请输入学生信息（学号 姓名 性别 年龄）：");
                    String id = scanner.next();
                    String name = scanner.next();
                    String gender = scanner.next();
                    int age = scanner.nextInt();
                    Student student = new Student(id, name, gender, age);
                    studentManager.addStudent(student);
                    break;
                case 2:
                    System.out.println("请输入学号：");
                    String deleteId = scanner.next();
                    studentManager.deleteStudentById(deleteId);
                    break;
                case 3:
                    studentManager.increaseAge();
                    break;
                case 4:
                    studentManager.showAllStudents();
                    break;
                case 5:
                    studentManager.sortByName();
                    break;
                default:
                    System.out.println("输入错误，请重新选择！");
                    break;
            }
        }
    }
}