使用Java代码实现学生管理系统的增删改查

好的，以下是使用Java代码实现学生管理系统的增删改查的示例：

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

public class StudentManagementSystem {
    private ArrayList<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 name, int age, String gender) {
        student.setName(name);
        student.setAge(age);
        student.setGender(gender);
    }

    public Student findStudentById(int id) {
        for (Student student : students) {
            if (student.getId() == id) {
                return student;
            }
        }
        return null;
    }

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

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

        // 添加学生
        Student student1 = new Student(1, "张三", 18, "男");
        Student student2 = new Student(2, "李四", 19, "女");
        system.addStudent(student1);
        system.addStudent(student2);

        // 显示所有学生
        System.out.println("所有学生信息：");
        system.displayAllStudents();

        // 根据ID查找学生
        System.out.println("请输入要查找的学生ID：");
        int id = scanner.nextInt();
        Student foundStudent = system.findStudentById(id);
        if (foundStudent == null) {
            System.out.println("未找到该学生！");
        } else {
            System.out.println("查找到的学生信息：");
            System.out.println(foundStudent.toString());
        }

        // 更新学生信息
        System.out.println("请输入要更新的学生ID：");
        id = scanner.nextInt();
        foundStudent = system.findStudentById(id);
        if (foundStudent == null) {
            System.out.println("未找到该学生！");
        } else {
            System.out.println("请输入新的学生姓名、年龄、性别：");
            String name = scanner.next();
            int age = scanner.nextInt();
            String gender = scanner.next();
            system.updateStudent(foundStudent, name, age, gender);
            System.out.println("更新成功！");
        }

        // 删除学生
        System.out.println("请输入要删除的学生ID：");
        id = scanner.nextInt();
        foundStudent = system.findStudentById(id);
        if (foundStudent == null) {
            System.out.println("未找到该学生！");
        } else {
            system.removeStudent(foundStudent);
            System.out.println("删除成功！");
        }

        // 显示所有学生
        System.out.println("所有学生信息：");
        system.displayAllStudents();
    }
}

class Student {
    private int id;
    private String name;
    private int age;
    private String gender;

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

    public int getId() {
        return id;
    }

    public void setId(int 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 String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "学生ID：" + id + "，姓名：" + name + "，年龄：" + age + "，性别：" + gender;
    }
}

这个示例实现了一个简单的学生管理系统，包括添加学生、删除学生、更新学生信息、查找学生和显示所有学生等功能。在主函数中，我们添加了两个学生，然后显示所有学生的信息，接着让用户输入要查找的学生ID，根据ID查找学生并显示其信息，然后让用户输入要更新的学生ID以及新的姓名、年龄、性别，更新学生信息并提示更新成功，接着让用户输入要删除的学生ID，删除学生并提示删除成功，最后再次显示所有学生的信息。