Small exercise of library management system

 Do a small exercise of library management to summarize the grammar knowledge learned before .
 This exercise , We only pay attention to how the framework is formed , Do not pay attention to the implementation of business logic .

1. The first step is to abstract the object of book
   What are the attributes of books ：
   Title , The author's name , The price of books , The type of book , Whether to be lent
   How to store these books ？
   Create a bookshelf class ,
   The number of books , What books are there
   Simultaneous use idea Generate set、get Method , Construction method （ There is no need to add the attribute of whether to be lent , Books are not lent by default ）, And rewrite toString Method .

2. The second step is to operate the books on the bookshelf
   When we look for a book , You need to return the attributes of the book by subscript
   When we want to add / When deleting a book , You need to set the properties of a book and add the location
   So we need to deal with books Array and useSize Conduct set and get operation .
   
   
   
   We can write all operations on bookshelves in this class , But for the convenience of later operation, I will create an additional package to set up the operation of the bookshelf

3. The third step is to manage the bookshelf

   • Look for books
   • New books
   • Delete books
   • Show books
   • Exit the system

   Because these operations are all for bookshelves , So use an interface to standardize them
   

4. Step 4: the administrator operates the menu to realize
   

5. Step 5: integrate them all
   

6. Step 6 implementation of business logic （ I only implement a display book ）
   
   The results of the implementation page are as follows ：
   
   I made some display changes , hold User On the menu hello Change to login , Then a separation line is added to the operation .

This is to build a library management system （ Simple version of ） All the steps of , I upload the code to git The above , Self access required , About the implementation of other business logic, the file I uploaded the day before yesterday is . Code link
modify ： I added BF Algorithm and KMP Algorithm, just click in as usual