package try_catch;

import java.util.Scanner;

public class TryCatchPractice2 {

//在类开始声明，则其他方法都能调用

Scanner in=new Scanner(System.in);

NoBookException NoB=new NoBookException();

String[] books={"语文","数学","英语"};

static TryCatchPractice2 trycat=new TryCatchPractice2();

//主函数

public static void main(String[]args) throws Exception{trycat.InputClassException();

}

//命令错误

public void InputClassException()throws Exception{

try{

System.out.println("欢迎光临本图书管理系统");

System.out.println("1.书名查询。2.序号查询");

int a=in.nextInt();

switch(a){

case 1://查找图书

trycat.findBooks();

break;

case 2://查找序号

trycat.findBooksNum();

break;

default:

throw new NoBookException("错误命令，请输入整数1