用Java实现一个学生信息管理系统

下面是一个用 Java 实现的学生信息管理系统的简单示例：

1. 定义学生类：

public class Student {
   private String name;
   private int age;
   private int id;
   
   public Student(String name, int age, int id) {
      this.name = name;
      this.age = age;
      this.id = id;
   }
   
   public String getName() {
      return name;
   }
   
   public int getAge() {
      return age;
   }
   
   public int getId() {
      return id;
   }
}

2. 定义学生信息管理类：

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

public class StudentManager {
   private List<Student> students = new ArrayList<>();
   
   public void addStudent(Student student) {
      students.add(student);
   }
   
   public void removeStudent(int id) {
      for (int i = 0; i < students.size(); i++) {
         Student student = students.get(i);
         if (student.getId() == id) {
            students.remove(i);
            break;
         }
      }
   }
   
   public List<Student> getAllStudents() {
      return students;
   }
}

3. 定义主程序类：

public class Main {
   public static void main(String[] args) {
      StudentManager manager = new StudentManager();
      manager.addStudent(new Student("张三", 20, 1));
      manager.addStudent(new Student("李四", 21, 2));
      manager.addStudent(new Student("王五", 22, 3));
      List<Student> students = manager.getAllStudents();
      for (Student student : students) {
         System.out.println(student.getName() + " " + student.getAge() + " " + student.getId());
      }
   }
}

这是一个非常简单的示例，可以用来作为学习的基础。实际的学生信息管理系统可能会更加复杂，你可以添加更多的功能，例如：查询、修改、排序等。