java写的一个图书管理系统

import java.util.Scanner; public class Main { public int menu(){ System.out.println("——————————————"); System.out.println("欢迎使用学生管理系统V1.0"); System.out.println("1.添加学生信息"); System.out.println("2.删除学生信息"); System.out.println("3.修改学生信息"); System.out.println("4.查询学生信息"); System.out.println("5.查看所有学生信息"); System.out.println("6.男女学生比例统计"); System.out.println("~~~~~~~~~~~~~~~~~~"); System.out.println("请输入您的选择："); Scanner scanner=new Scanner(System.in); int choice=scanner.nextInt(); return choice; } public static void main(String[] args) { Main me=new Main(); Add add=new Add(); Search search=new Search(); Del del=new Del(); Change change=new Change(); Borrow borrow=new Borrow(); Return re=new Return(); showALL show=new showALL(); bookList bklist = new bookList(); while (true) { int choice = me.menu(); switch (choice){ case 1: search.work(bklist); break; case 2: add.work(bklist); break; case 3: del.work(bklist); break; case 4: change.work(bklist); break; case 5: borrow.work(bklist); break; case 6: re.work(bklist); break; case 7: show.work(bklist); default: break; } }//在进行退出系统的功能时，会一直进行循环，menu（）函数最终会返回一个整型数，对应选择操作中的一项 } }