为什么我在使用图书名称查找方法的时候，在控制台输入不进去名称啊？ 急急急

Question

1. 代码：

   package com.BorrowBooks;

   
   

   //import java.awt.print.Book;
   import java.util.Scanner;

   
   

   public class book {
     @SuppressWarnings("resource")
     public static void main(String[] args){
      for(;;){
      System.out.println("欢迎使用借书系统");
      System.out.println("输入命令：1.按名称查找图书   2.按序号查找图书");
      Scanner in=new Scanner(System.in);
      int choice = 3;
   //   int i= 0;
   //   int j = 0;
   //   String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
      try{
       choice = in.nextInt();
      }catch(Exception e){
       System.out.println("命令输入错误，请根据提示输入整形的数字");
       continue;
      }
      if(choice == 1){
   //    System.out.println("请输入你要借的书的名称");
   //    for(i=0;i<Book.length;i++){
   //    try{
   //        in.nextLine().equals(Book[i]);
   //       System.out.println("Book:"+Book[i]);
   //       break;
   //    }catch(Exception e){
   //     System.out.println("图书不存在");
   //     continue;
   //    }
   //    }
   //   System.out.println("Book:"+Book[i]);
       book Mc = new book();
       Mc.find1();
      }else if(choice == 2){
   //    System.out.println("请输入你要借的书的序号");
   //    for(j=0;j<Book.length;j++){
   //    try{
   //       j=in.nextInt();
   //     System.out.println("Book:"+Book[j]);
   //     break;
   //    }catch(Exception e){
   //     System.out.println("图书不存在");
   //     continue;
   //    }
   //    }
   //    System.out.println("Book:"+Book[j]);
       book Xh = new book();
       Xh.find2();
      }else {
       System.out.println("你的选择错误");
      }
     }
     }
     @SuppressWarnings("resource")
     public void find1(){
      int i = 0;
      String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
      System.out.println("请输入你要借的书的名称");
      Scanner in=new Scanner(System.in);
      for(i=0;i<Book.length;i++){
      try{
          in.nextLine().equals(Book[i]);
         System.out.println("Book:"+Book[i]);
         break;
      }catch(Exception e){
       System.out.println("图书不存在");
       continue;
      }
      }
     }
     @SuppressWarnings("resource")
     public void find2(){
      int j = 0;
      String[] Book = {"高数","线代","概率论与数理统计","大学英语","数据库","操作系统","java面向对象"};
      System.out.println("请输入你要借的书的序号");
      Scanner in=new Scanner(System.in);
      for(j=0;j<Book.length;j++){
      try{
         j=in.nextInt();
       System.out.println("Book:"+Book[j]);
       break;
      }catch(Exception e){
       System.out.println("图书不存在");
       continue;
      }
      }
     }
    }