3用Java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;
    }

    // getter and setter methods

    public void increaseAge() {
        age++;
    }

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

    @Override
    public int compareTo(Student o) {
        return this.name.compareTo(o.name);
    }
}

public class StudentManager {
    private Student[] students;
    private int size;

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

    public void addStudent(Student student) {
        if (size >= students.length) {
            System.out.println("Error: Student array is full.");
            return;
        }
        students[size++] = student;
    }

    public void deleteStudent(String id) {
        for (int i = 0; i < size; i++) {
            if (students[i].getId().equals(id)) {
                for (int j = i + 1; j < size; j++) {
                    students[j - 1] = students[j];
                }
                students[--size] = null;
                return;
            }
        }
        System.out.println("Error: Student not found.");
    }

    public void increaseAge() {
        for (int i = 0; i < size; i++) {
            students[i].increaseAge();
        }
    }

    public void showStudents() {
        for (int i = 0; i < size; i++) {
            System.out.println(students[i]);
        }
    }

    public void sortByName() {
        Arrays.sort(students, 0, size);
    }
}

public class Main {
    public static void main(String[] args) {
        StudentManager manager = new StudentManager(10);
        manager.addStudent(new Student("1001", "张三", "男", 18));
        manager.addStudent(new Student("1002", "李四", "女", 19));
        manager.addStudent(new Student("1003", "王五", "男", 20));

        manager.showStudents();

        System.out.println("--------");

        manager.deleteStudent("1002");

        manager.showStudents();

        System.out.println("--------");

        manager.increaseAge();

        manager.showStudents();

        System.out.println("--------");

        manager.sortByName();

        manager.showStudents();
    }
}