用Java编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 int id;
    private String name;
    private char gender;
    private int age;

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

    //getter and setter methods

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

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


import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class StudentManager {
    private ArrayList<Student> students;

    public StudentManager() {
        students = new ArrayList<>();
    }

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(int id) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId() == id) {
                students.remove(i);
                break;
            }
        }
    }

    public void increaseAge() {
        for (Student student : students) {
            student.setAge(student.getAge() + 1);
        }
    }

    public void displayStudents() {
        for (Student student : students) {
            System.out.println(student);
        }
    }

    public void sortByName() {
        Collections.sort(students);
    }

    public static void main(String[] args) {
        StudentManager manager = new StudentManager();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("1. Add student");
            System.out.println("2. Remove student by id");
            System.out.println("3. Increase age of all students");
            System.out.println("4. Display all students");
            System.out.println("5. Sort students by name");
            System.out.println("0. Exit");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.println("Enter student id:");
                    int id = scanner.nextInt();
                    System.out.println("Enter student name:");
                    String name = scanner.next();
                    System.out.println("Enter student gender:");
                    char gender = scanner.next().charAt(0);
                    System.out.println("Enter student age:");
                    int age = scanner.nextInt();
                    Student student = new Student(id, name, gender, age);
                    manager.addStudent(student);
                    break;
                case 2:
                    System.out.println("Enter student id:");
                    int removeId = scanner.nextInt();
                    manager.removeStudent(removeId);
                    break;
                case 3:
                    manager.increaseAge();
                    break;
                case 4:
                    manager.displayStudents();
                    break;
                case 5:
                    manager.sortByName();
                    break;
                case 0:
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }
}