用Java增删改查的学员管理项目

你好！对于学员管理项目，你可以使用Java编写增删改查的功能。以下是一个简单的示例：

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;
    }

    // Getters and setters

    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 getGrade() {
        return grade;
    }

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

class StudentManagementSystem {
    private List<Student> students;

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

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

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

    public void updateStudent(Student student, String newName, int newAge, String newGrade) {
        student.setName(newName);
        student.setAge(newAge);
        student.setGrade(newGrade);
    }

    public void displayAllStudents() {
        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 class Main {
    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 all students");
            System.out.println("0. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume newline character

            switch (choice) {
                case 1:
                    System.out.print("Enter student name: ");
                    String name = scanner.nextLine();
                    System.out.print("Enter student age: ");
                    int age = scanner.nextInt();
                    scanner.nextLine(); // Consume newline character
                    System.out.print("Enter student grade: ");
                    String grade = scanner.nextLine();
                    Student newStudent = new Student(name, age, grade);
                    system.addStudent(newStudent);
                    System.out.println("Student added successfully!");
                    break;
                case 2:
                    System.out.print("Enter student name to remove: ");
                    String nameToRemove = scanner.nextLine();
                    boolean removed = false;
                    for (Student student : system.getStudents()) {
                        if (student.getName().equals(nameToRemove)) {
                            system.removeStudent(student);
                            removed = true;
                            System.out.println("Student removed successfully!");
                            break;
                        }
                    }
                    if (!removed) {
                        System.out.println("Student not found!");
                    }
                    break;
                case 3:
                    System.out.print("Enter student name to update: ");
                    String nameToUpdate = scanner.nextLine();
                    boolean updated = false;
                    for (Student student : system.getStudents()) {
                        if (student.getName().equals(nameToUpdate)) {
                            System.out.print("Enter new name: ");
                            String newName = scanner.nextLine();
                            System.out.print("Enter new age: ");
                            int newAge = scanner.nextInt();
                            scanner.nextLine(); // Consume newline character
                            System.out.print("Enter new grade: ");
                            String newGrade = scanner.nextLine();
                            system.updateStudent(student, newName, newAge, newGrade);
                            updated = true;
                            System.out.println("Student updated successfully!");
                            break;
                        }
                    }
                    if (!updated) {
                        System.out.println("Student not found!");
                    }
                    break;
                case 4:
                    system.displayAllStudents();
                    break;
                case 0:
                    System.out.println("Exiting program...");
                    System.exit(0);
                default:
                    System.out.println("Invalid choice!");
            }
        }
    }
}

这是一个基本的学员管理系统，使用了Java的面向对象编程。你可以通过菜单选择来添加、删除、更新和显示学员信息。希望这个示例对你有帮助！如果有任何问题，请随时向我提问。