用Java实现学生管理系统

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

class Student {
    private String name;
    private int age;
    private String grade;

    public Student(String name, int age, String grade) {
        this.name = name;
        this.age = age;
        this.grade = grade;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public String getGrade() {
        return grade;
    }

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

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

    public void setGrade(String grade) {
        this.grade = grade;
    }
}

public class StudentManagementSystem {
    private List<Student> students;

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

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

    public void removeStudent(String name) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getName().equals(name)) {
                students.remove(i);
                System.out.println("Student removed successfully!");
                return;
            }
        }
        System.out.println("Student not found!");
    }

    public void updateStudent(String name) {
        for (Student student : students) {
            if (student.getName().equals(name)) {
                Scanner scanner = new Scanner(System.in);
                System.out.print("Enter updated name: ");
                String updatedName = scanner.nextLine();
                System.out.print("Enter updated age: ");
                int updatedAge = scanner.nextInt();
                System.out.print("Enter updated grade: ");
                String updatedGrade = scanner.next();
                student.setName(updatedName);
                student.setAge(updatedAge);
                student.setGrade(updatedGrade);
                System.out.println("Student updated successfully!");
                return;
            }
        }
        System.out.println("Student not found!");
    }

    public void displayStudents() {
        System.out.println("Student List:");
        for (Student student : students) {
            System.out.println("Name: " + student.getName());
            System.out.println("Age: " + student.getAge());
            System.out.println("Grade: " + student.getGrade());
            System.out.println("--------------------");
        }
    }

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

        while (true) {
            System.out.println("1. Add Student");
            System.out.println("2. Remove Student");
            System.out.println("3. Update Student");
            System.out.println("4. Display Students");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.print("Enter student name: ");
                    String name = scanner.next();
                    System.out.print("Enter student age: ");
                    int age = scanner.nextInt();
                    System.out.print("Enter student grade: ");
                    String grade = scanner.next();
                    Student student = new Student(name, age, grade);
                    system.addStudent(student);
                    System.out.println("Student added successfully!");
                    break;
                case 2:
                    System.out.print("Enter student name to remove: ");
                    String removeName = scanner.next();
                    system.removeStudent(removeName);
                    break;
                case 3:
                    System.out.print("Enter student name to update: ");
                    String updateName = scanner.next();
                    system.updateStudent(updateName);
                    break;
                case 4:
                    system.displayStudents();
                    break;
                case 5:
                    System.out.println("Exiting...");
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice! Please try again.");
            }
        }
    }
}