第三周 七月九日

开始尝试写最基础的学生管理系统

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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;     } }   class StudentManagementSystem {     private List<Student> students;       public StudentManagementSystem() {         students = new ArrayList<>();     }       public void addStudent(Student student) {         students.add(student);     }       public void removeStudent(String name) {         students.removeIf(s -> s.getName().equals(name));     }       public List<Student> getStudents() {         return students;     } }   public class Main {     public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);         StudentManagementSystem sms = new StudentManagementSystem();           while (true) {             System.out.println("学生管理系统");             System.out.println("1. 添加学生");             System.out.println("2. 删除学生");             System.out.println("3. 显示所有学生");             System.out.println("4. 退出系统");             System.out.print("请输入选项: ");             int option = scanner.nextInt();             scanner.nextLine();               if (option == 1) {                 System.out.print("请输入学生姓名: ");                 String name = scanner.nextLine();                 System.out.print("请输入学生年龄: ");                 int age = scanner.nextInt();                 scanner.nextLine();                 System.out.print("请输入学生年级: ");                 String grade = scanner.nextLine();                   Student student = new Student(name, age, grade);                 sms.addStudent(student);                 System.out.println("添加学生成功！");             } else if (option == 2) {                 System.out.print("请输入要删除的学生姓名: ");                 String name = scanner.nextLine();                 sms.removeStudent(name);                 System.out.println("删除学生成功！");             } else if (option == 3) {                 List<Student> students = sms.getStudents();                 if (students.isEmpty()) {                     System.out.println("暂无学生信息！");                 } else {                     System.out.println("学生信息如下：");                     for (Student student : students) {                         System.out.println("姓名: " + student.getName());                         System.out.println("年龄: " + student.getAge());                         System.out.println("年级: " + student.getGrade());                         System.out.println("------------------------");                     }                 }             } else if (option == 4) {                 System.out.println("退出学生管理系统。");                 break;             } else {                 System.out.println("无效的选项，请重新输入！");             }               System.out.println();         }           scanner.close();     } }