总感觉哪里不对，谁帮忙看看

package com.book.borrow;
import java.util.Scanner;
public class BookLend {

 public static void main(String[] args) {
  // TODO 自动生成的方法存根
  String book[] = {"物理","地理","化学","音乐","体育"};
  Scanner input = new Scanner(System.in);
  int in1;
  String bookName;
  int bookNum;
  System.out.println("**********欢迎来到图书借阅系统**********");
  do{
   System.out.println("输入命令：1-按照名称查找图书；2-按照序号查找图书");
   in1 = input.nextInt();
   if(in1!=1&&in1!=2){
    System.out.println("命令输入错误！请根据提示输入数字命令！");
    continue;
   }
   
   if(in1==1){
    System.out.println("请输入图书名称：");
    bookName = input.next();
    try{
     for(String x:book) {
      if(bookName.equals(x)){
       System.out.println("book:"+bookName);
       break;
      }else{
       throw new BookException(bookName);
       
      }
     }
    }catch(BookException e){
     System.out.println("您输入的图书不存在！");
     in1=0;
     continue;
    }
   }
   
   if(in1==2){
    System.out.println("请输入图书序号：");
    bookNum = input.nextInt();
    try{
     if(bookNum>0&&bookNum<=book.length){
      System.out.println("book:"+book[bookNum-1]);
      break;
     }else{
      throw new BookException(bookNum);
     }
    }catch(BookException e){
     System.out.println("您输入的图书不存在！");
     in1=0;
     continue;
    }
   }
   
  }while(in1!=1&&in1!=2);
  
 }

}