Java学生信息管理系教程详解

public class Student {
    private String id;
    private String name;
    private int age;
    private double score;
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.List;
public class StudentManager {
private List students = new ArrayList<>();
// 添加学生
public void addStudent(Student student) {
    students.add(student);
    System.out.println("学生添加成功！");
}

// 根据学号删除学生
public boolean removeStudent(String id) {
    return students.removeIf(student -> student.getId().equals(id));
}

// 根据学号查找学生
public Student findStudentById(String id) {
    for (Student s : students) {
        if (s.getId().equals(id)) {
            return s;
        }
    }
    return null;
}

// 修改学生信息
public boolean updateStudent(String id, String name, int age, double score) {
    Student student = findStudentById(id);
    if (student != null) {
        student.setName(name);
        student.setAge(age);
        student.setScore(score);
        return true;
    }
    return false;
}

// 显示所有学生
public void showAllStudents() {
    if (students.isEmpty()) {
        System.out.println("暂无学生信息。");
    } else {
        for (Student s : students) {
            System.out.println(s);
        }
    }
}
}

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
StudentManager manager = new StudentManager();
    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. 删除学生");
        System.out.println("3. 查询学生");
        System.out.println("4. 修改学生");
        System.out.println("5. 显示所有学生");
        System.out.println("6. 退出");
        System.out.print("请选择操作：");

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

        switch (choice) {
            case 1:
                System.out.print("请输入学号：");
                String id = input.nextLine();
                System.out.print("请输入姓名：");
                String name = input.nextLine();
                System.out.print("请输入年龄：");
                int age = input.nextInt();
                System.out.print("请输入成绩：");
                double score = input.nextDouble();
                manager.addStudent(new Student(id, name, age, score));
                break;

            case 2:
                System.out.print("请输入要删除的学生学号：");
                String delId = input.nextLine();
                if (manager.removeStudent(delId)) {
                    System.out.println("删除成功！");
                } else {
                    System.out.println("未找到该学生！");
                }
                break;

            case 3:
                System.out.print("请输入要查询的学生学号：");
                String findId = input.nextLine();
                Student student = manager.findStudentById(findId);
                if (student != null) {
                    System.out.println("找到学生：" + student);
                } else {
                    System.out.println("未找到该学生！");
                }
                break;

            case 4:
                System.out.print("请输入要修改的学生学号：");
                String updateId = input.nextLine();
                System.out.print("请输入新姓名：");
                String newName = input.nextLine();
                System.out.print("请输入新年龄：");
                int newAge = input.nextInt();
                System.out.print("请输入新成绩：");
                double newScore = input.nextDouble();
                if (manager.updateStudent(updateId, newName, newAge, newScore)) {
                    System.out.println("修改成功！");
                } else {
                    System.out.println("修改失败，未找到该学生！");
                }
                break;

            case 5:
                manager.showAllStudents();
                break;

            case 6:
                System.out.println("退出系统，再见！");
                input.close();
                return;

            default:
                System.out.println("无效选择，请重新输入！");
        }
    }
}
}