Java中班级学生管理系统小项目

public class Student {
    private int id;
    private String name;
    private int age;
    private String gender;
<pre class='brush:java;toolbar:false;'>public Student(int id, String name, int age, String gender) {
    this.id = id;
    this.name = name;
    this.age = age;
    this.gender = gender;
}

// Getter 和 Setter 方法
public int getId() { return id; }
public void setId(int id) { this.id = id; }

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

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

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

@Override
public String toString() {
    return "ID: " + id + ", 姓名: " + name + ", 年龄: " + age + ", 性别: " + gender;
}

import java.util.ArrayList;
import java.util.Scanner;
<p>public class StudentManager {
private ArrayList<Student> students = new ArrayList<>();
private Scanner scanner = new Scanner(System.in);</p><pre class='brush:java;toolbar:false;'>public void start() {
    while (true) {
        System.out.println("\n--- 班级学生管理系统 ---");
        System.out.println("1. 添加学生");
        System.out.println("2. 删除学生");
        System.out.println("3. 修改学生");
        System.out.println("4. 查询所有学生");
        System.out.println("5. 根据ID查询学生");
        System.out.println("6. 退出");
        System.out.print("请选择操作：");

        int choice = scanner.nextInt();
        switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                deleteStudent();
                break;
            case 3:
                updateStudent();
                break;
            case 4:
                listAllStudents();
                break;
            case 5:
                findStudentById();
                break;
            case 6:
                System.out.println("退出系统。");
                return;
            default:
                System.out.println("无效选择，请重试。");
        }
    }
}

private void addStudent() {
    System.out.print("输入ID: ");
    int id = scanner.nextInt();
    if (findStudentById(id) != null) {
        System.out.println("该ID已存在！");
        return;
    }
    System.out.print("输入姓名: ");
    String name = scanner.next();
    System.out.print("输入年龄: ");
    int age = scanner.nextInt();
    System.out.print("输入性别: ");
    String gender = scanner.next();

    students.add(new Student(id, name, age, gender));
    System.out.println("学生添加成功！");
}

private void deleteStudent() {
    System.out.print("输入要删除的学生ID: ");
    int id = scanner.nextInt();
    Student stu = findStudentById(id);
    if (stu != null) {
        students.remove(stu);
        System.out.println("删除成功！");
    } else {
        System.out.println("未找到该学生。");
    }
}

private void updateStudent() {
    System.out.print("输入要修改的学生ID: ");
    int id = scanner.nextInt();
    Student stu = findStudentById(id);
    if (stu == null) {
        System.out.println("未找到该学生。");
        return;
    }

    System.out.print("新姓名: ");
    String name = scanner.next();
    System.out.print("新年龄: ");
    int age = scanner.nextInt();
    System.out.print("新性别: ");
    String gender = scanner.next();

    stu.setName(name);
    stu.setAge(age);
    stu.setGender(gender);
    System.out.println("修改成功！");
}

private void listAllStudents() {
    if (students.isEmpty()) {
        System.out.println("暂无学生信息。");
    } else {
        for (Student s : students) {
            System.out.println(s);
        }
    }
}

private Student findStudentById(int id) {
    for (Student s : students) {
        if (s.getId() == id) {
            return s;
        }
    }
    return null;
}

public class Main {
    public static void main(String[] args) {
        StudentManager manager = new StudentManager();
        manager.start();
    }
}