package borrow_books;

import java.util.InputMismatchException;
import java.util.Scanner;

public class Test {
    int command;
    Scanner input = new Scanner(System.in);
    String book[] = {"高数", "数据结构"};

    public static void main(String[] args) {
        while (true){Test test=new Test();
        test.inputCommend();
        if(test.command==1){
            test.inputName();
        }else if(test.command==2){
            test.inputNumber();
        }else if (test.command==3){
            System.out.println("退出程序");
            break;
        }
    }}
    public class ErrorFanhuiException extends Exception{
        public ErrorFanhuiException(){
            super("输入错误，请输入数字命令");
        }
    }
    public class BooknotExistException extends Exception{
        public BooknotExistException(){
            super("图书不存在");
        }
    }
    public void inputCommend(){
        try {
            System.out.println("输入命令：1-按名称查找图书 2-按数字查找图书 3-退出");
            command=input.nextInt();
            if((command!=1)&&(command!=2)&&(command!=3)){
                throw new ErrorFanhuiException();
            }
        }catch (InputMismatchException ie){
            ErrorFanhuiException ee=new ErrorFanhuiException();
            System.out.println(ee.getMessage());
        }catch (ErrorFanhuiException ee){
            System.out.println(ee.getMessage());
        }
    }
    public void inputName(){
        try {
            System.out.print("输入图书名称:");
            String a2=input.next();
            for(int i=0;i< book.length;i++){
                if(book[i].equals(a2)){
                    System.out.println("book:"+book[i]);
                    return;
                }
            }
            throw new BooknotExistException();
        }catch (Exception e){
            System.out.println(e.getMessage());
        }


    }
    public void inputNumber(){
        try {
            System.out.print("输入图书序号:");
            int a3=input.nextInt();
            for (int i=0;i< book.length;i++){
                if (a3==i){
                    System.out.println("book:"+book[i]);
                    return;
                }
            }
            throw new BooknotExistException();
        }catch (InputMismatchException ie){
            input.nextLine();
            ErrorFanhuiException ee=new ErrorFanhuiException();
            System.out.println(ee.getMessage());
        }catch (BooknotExistException be){
            System.out.println(be.getMessage());
            return;
        }
        }


}