JAVA。图书管理系统，报错如下，请问是什么问题呢？该怎么解决呢？
package cn.edu.xxx.blms;
import cn.edu.xxx.blms.service.BookService;
import java.util.Scanner;
/**时间:
* 作者:
* 图书管理系统主类
*/
public class App {
/**
* 输入扫描器
*/
public static Scanner input;
/**
* 程序启动
*/
public void run() {
input = new Scanner(System.in);
String systemMenuChoice;
do {
systemMenu();
systemMenuChoice = input.nextLine();
switch (systemMenuChoice) {
case "0":
System.out.println("成功退出系统，欢迎再次使用！");
break;
case "1":
String readerMenuChoice;
do {
readerMenu();
readerMenuChoice = input.nextLine();
switch (readerMenuChoice) {
case "0":
break;
case "1":
readerService.create();
break;
case "2":
readerService.disable();
break;
case "3":
readerService.update();
break;
case "4":
readerService.query();
break;
default:
System.out.println("输入非法，请输入正确的菜单编号！");
}
}while(!("0").equals(readerMenuChoice));
break;
case "2":
String bookMenuChoice;
do {
bookMenu();
bookMenuChoice = input.nextLine();
switch (bookMenuChoice) {
case "0":
break;
case "1":
bookService.create();
break;
case "2":
bookService.disable();
break;
case "3":
bookService.update();
break;
case "4":
bookService.query();
break;
default:
System.out.println("输入非法，请输入正确的菜单编号！");
}
} while(!("0").equals(bookMenuChoice));
break;
case "3":
//TODO：实现借还图书菜单交互
String borrowingMenuChoice;
do {
borrowingMenu();
borrowingMenuChoice = input.nextLine();
switch (borrowingMenuChoice) {
case "0":
break;
case "1":
//TODO:借阅图书
break;
case "2":
//TODO：归还图书
break;
case "3":
//TODO：查询记录
break;
default:
System.out.println("输入非法，请输入正确的菜单编号！");
}
}while(!("0").equals(borrowingMenuChoice));
break;
default:
System.out.println("输入非法，请输入正确的菜单编号！");
}
}
while (!"0".equals(systemMenuChoice)) ;
input.close();
}
public void systemMenu() {
System.out.println("----------------------------");
System.out.println(" 图书管理系统 ");
System.out.println("-----------------------------");
System.out.println("｜ 0...退出系统 ｜");
System.out.println("｜ 1...读者管理 ｜");
System.out.println("｜ 0...图书管理 ｜");
System.out.println("｜ 0...借还图书 ｜");
System.out.println("-----------------------------");
System.out.print("请输入选项：");
}
/**
* 输出读者管理菜单
*/
public void readerMenu() {
System.out.println("----------------------------");
System.out.println(" 读者管理 ");
System.out.println("-----------------------------");
System.out.println("｜ 0...返回上级 ｜");
System.out.println("｜ 1...添加读者 ｜");
System.out.println("｜ 2...禁用读者 ｜");
System.out.println("｜ 3...编辑读者 ｜");
System.out.println("｜ 4...查询读者 ｜");
System.out.println("-----------------------------");
System.out.print("请输入选项：");
}
/**
* 输出图书管理菜单
*/
public void bookMenu() {
System.out.println("----------------------------");
System.out.println(" 图书管理 ");
System.out.println("-----------------------------");
System.out.println("｜ 0...返回上级 ｜");
System.out.println("｜ 1...添加图书 ｜");
System.out.println("｜ 2...废弃图书 ｜");
System.out.println("｜ 3...编辑图书 ｜");
System.out.println("｜ 4...查询图书 ｜");
System.out.println("-----------------------------");
System.out.print("请输入选项：");
}
/**
* 输出借还图书菜单
*/
public void borrowingMenu() {
System.out.println("----------------------------");
System.out.println(" 借还图书 ");
System.out.println("-----------------------------");
System.out.println("｜ 0...返回上级 ｜");
System.out.println("｜ 1...借阅图书 ｜");
System.out.println("｜ 2...归还图书 ｜");
System.out.println("｜ 3...查询记录 ｜");
System.out.println("-----------------------------");
System.out.print("请输入选项：");
}
public static void main(String[] args) {
App app = new App();
app.run();
}
public ReaderService readerService;
public BookService bookService;
public App(ReaderService readerService, BookService bookService){
this.readerService = readerService;
this.bookService = bookService;
}
public static void main(String[] args){
App app = new App(new ReaderService(),new BookService());
app.run();
}
}
