java学生信息管理系统代码

以下是一个简单的Java学生信息管理系统代码：

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

public class StudentManagementSystem {

    private ArrayList<Student> students;

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

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

    public void removeStudent(Student student) {
        students.remove(student);
    }

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

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

        while (true) {
            System.out.println("Select an option:");
            System.out.println("1. Add student");
            System.out.println("2. Remove student");
            System.out.println("3. Display students");
            System.out.println("4. Quit");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.println("Enter student name:");
                    String name = scanner.nextLine();
                    System.out.println("Enter student ID:");
                    String id = scanner.nextLine();
                    System.out.println("Enter student grade:");
                    double grade = scanner.nextDouble();
                    scanner.nextLine();
                    Student student = new Student(name, id, grade);
                    system.addStudent(student);
                    break;
                case 2:
                    System.out.println("Enter student ID:");
                    id = scanner.nextLine();
                    for (Student s : system.students) {
                        if (s.getId().equals(id)) {
                            system.removeStudent(s);
                        }
                    }
                    break;
                case 3:
                    system.displayStudents();
                    break;
                case 4:
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice.");
                    break;
            }
        }
    }
}

class Student {
    private String name;
    private String id;
    private double grade;

    public Student(String name, String id, double grade) {
        this.name = name;
        this.id = id;
        this.grade = grade;
    }

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public double getGrade() {
        return grade;
    }

    public String toString() {
        return "Name: " + name + ", ID: " + id + ", Grade: " + grade;
    }
}

这个学生信息管理系统使用了 ArrayList 存储学生对象，并提供了添加、删除和显示学生信息的功能。在 main 方法中，使用了一个 while 循环来持续监听用户输入，并根据用户选择的不同操作来调用不同的方法。