在Java中如何实现学生信息管理系统_学生信息系统开发指南

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

// Getter 和 Setter 方法
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 int getAge() { return age; }
public void setAge(int age) { this.age = age; }

public double getScore() { return score; }
public void setScore(double score) { this.score = score; }

@Override
public String toString() {
    return "学号：" + id + "，姓名：" + name + "，年龄：" + age + "，成绩：" + score;
}

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--- 学生信息管理系统 ---");
        System.out.println("1. 添加学生");
        System.out.println("2. 查看所有学生");
        System.out.println("3. 查询学生");
        System.out.println("4. 修改学生");
        System.out.println("5. 删除学生");
        System.out.println("6. 退出");
        System.out.print("请选择操作：");

        int choice = scanner.nextInt();
        scanner.nextLine(); // 消费换行符

        switch (choice) {
            case 1 -> addStudent();
            case 2 -> viewAllStudents();
            case 3 -> findStudent();
            case 4 -> updateStudent();
            case 5 -> deleteStudent();
            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("请输入学号：");
    String id = scanner.nextLine();
    if (findStudentById(id) != null) {
        System.out.println("该学号已存在！");
        return;
    }

    System.out.print("请输入姓名：");
    String name = scanner.nextLine();
    System.out.print("请输入年龄：");
    int age = scanner.nextInt();
    System.out.print("请输入成绩：");
    double score = scanner.nextDouble();
    scanner.nextLine();

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

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

private void findStudent() {
    System.out.print("请输入要查询的学号：");
    String id = scanner.nextLine();
    Student s = findStudentById(id);
    if (s != null) {
        System.out.println("找到学生：" + s);
    } else {
        System.out.println("未找到该学生。");
    }
}

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

private void updateStudent() {
    System.out.print("请输入要修改的学号：");
    String id = scanner.nextLine();
    Student s = findStudentById(id);
    if (s == null) {
        System.out.println("未找到该学生。");
        return;
    }

    System.out.print("请输入新姓名：");
    String name = scanner.nextLine();
    System.out.print("请输入新年龄：");
    int age = scanner.nextInt();
    System.out.print("请输入新成绩：");
    double score = scanner.nextDouble();
    scanner.nextLine();

    s.setName(name);
    s.setAge(age);
    s.setScore(score);
    System.out.println("学生信息已更新！");
}

private void deleteStudent() {
    System.out.print("请输入要删除的学号：");
    String id = scanner.nextLine();
    Student s = findStudentById(id);
    if (s == null) {
        System.out.println("未找到该学生。");
        return;
    }
    students.remove(s);
    System.out.println("学生删除成功！");
}

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