Java题，我不知道怎么写

Question

编写一个书店应用程序。实现书籍入库，查看书籍列表，根据作者或者书名查找书籍，卖出书籍，书籍下架功能。书籍信息包含：编码，名称，库存，简介，出版社，价格，作者。注：同一本书编号相同。基本要求] 使用List和String。 [测试数据] 自定义

Answer 1

package com.sxt.pojo;

import java.util.Objects;

/**
 * 书籍信息
 *
 * @author 刘逸晖
 */
public class Book {

    /**
     * id
     */
    private int id = 0;
    /**
     * 编码
     */
    private String coding = "";

    /**
     * 名称
     */
    private String name = "";

    /**
     * 库存
     */
    private int inventory = 0;

    /**
     * 简介
     */
    private String describe = "";

    /**
     * 出版社
     */
    private String press = "";

    /**
     * 价格
     */
    private int price = 0;

    /**
     * 作者
     */
    private String author = "";

    /**
     * 0为下架，1为上架
     */
    private int status = 0;

    public Book() {
    }

    public Book(int id, String coding, String name, int inventory, String describe, String press, int price, String author, int status) {
        this.id = id;
        this.coding = coding;
        this.name = name;
        this.inventory = inventory;
        this.describe = describe;
        this.press = press;
        this.price = price;
        this.author = author;
        this.status = status;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Book book = (Book) o;
        return this.id == book.getId();
    }

    @Override
    public int hashCode() {
        return Objects.hash(name);
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", coding='" + coding + '\'' +
                ", name='" + name + '\'' +
                ", inventory=" + inventory +
                ", describe='" + describe + '\'' +
                ", press='" + press + '\'' +
                ", price=" + price +
                ", author='" + author + '\'' +
                ", status=" + status +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getCoding() {
        return coding;
    }

    public void setCoding(String coding) {
        this.coding = coding;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getInventory() {
        return inventory;
    }

    public void setInventory(int inventory) {
        this.inventory = inventory;
    }

    public String getDescribe() {
        return describe;
    }

    public void setDescribe(String describe) {
        this.describe = describe;
    }

    public String getPress() {
        return press;
    }

    public void setPress(String press) {
        this.press = press;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }
}

package com.sxt.pojo;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * 书店
 *
 * @author 刘逸晖
 */
public class BookStore {

    /**
     * 书籍列表
     */
    private List<Book> bookList = new ArrayList<>();

    public BookStore() {
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        BookStore bookStore = (BookStore) o;
        return Objects.equals(bookList, bookStore.bookList);
    }

    @Override
    public int hashCode() {
        return Objects.hash(bookList);
    }

    @Override
    public String toString() {
        return "BookStore{" +
                "bookList=" + bookList +
                '}';
    }

    public List<Book> getBookList() {
        return bookList;
    }

    public void setBookList(List<Book> bookList) {
        this.bookList = bookList;
    }
}

package com.sxt.application;

import com.sxt.pojo.Book;
import com.sxt.pojo.BookStore;

import java.util.ArrayList;
import java.util.List;

/**
 * 处理书籍相关业务
 *
 * @author 刘逸晖
 */
public class BookApplication {

    /**
     * 书店
     */
    public static BookStore bookStore = new BookStore();

    public static void main(String[] args) {
        List<Book> bookList = new ArrayList<>();

        Book book1 = new Book(1001, "utf-8", "书籍1", 100, "第1种书", "出版社1", 999, "作者1", 1);
        Book book2 = new Book(1002, "utf-8", "书籍2", 100, "第2种书", "出版社2", 999, "作者2", 1);
        Book book3 = new Book(1003, "utf-8", "书籍3", 100, "第3种书", "出版社3", 999, "作者3", 1);
        Book book4 = new Book(1004, "utf-8", "书籍4", 100, "第4种书", "出版社4", 999, "作者4", 1);
        Book book5 = new Book(1005, "utf-8", "书籍5", 100, "第5种书", "出版社5", 999, "作者5", 1);

        bookList.add(book1);
        bookList.add(book2);
        bookList.add(book3);
        bookList.add(book4);
        bookList.add(book5);

        bookStore.setBookList(bookList);

        Book book6 = new Book(1006, "utf-8", "书籍6", 100, "第种书", "出版社6", 999, "作者6", 1);
        System.out.println("向书店里新增第6种书：");
        System.out.println(insertBook(book6));

        System.out.println("向书店里新增第6种书：");
        System.out.println(insertBook(book6));

        System.out.println("查询所有书籍：");
        System.out.println(selectBookAll());

        System.out.println("根据书名查询店内的书籍：");
        System.out.println(selectBookByName("书籍1"));

        System.out.println("根据作者查询店内的书籍：");
        System.out.println(selectBookByAuthor("作者1"));

        System.out.println("购买第一种书籍：");
        System.out.println(buyBook(1001, 1));

        System.out.println("下架第一种书");
        System.out.println(updateBookStatus(1001, 0));

        System.out.println("购买第一种书籍：");
        System.out.println(buyBook(1001, 1));

        System.out.println("根据id查询店内的书籍：");
        System.out.println(selectBookById(1001));

    }

    /**
     * 像书店内新增一种书籍
     *
     * @param book 预入库的书籍
     */
    public static boolean insertBook(Book book) {

        if (book == null || bookStore.getBookList().contains(book)) {
            return false;
        } else {
            bookStore.getBookList().add(book);
            return true;
        }
    }

    /**
     * 查询书店内的所有书籍
     *
     * @return
     */
    public static List<Book> selectBookAll() {
        return bookStore.getBookList();
    }

    /**
     * 根据书名查询店内的书籍
     *
     * @param bookName 书籍名称
     * @return
     */
    public static List<Book> selectBookByName(String bookName) {

        if (bookName == null || bookName.equals("")) {
            return null;
        }

        List<Book> resultList = new ArrayList<>();

        for (Book book : bookStore.getBookList()) {
            if (bookName.equals(book.getName())) {
                resultList.add(book);
            }
        }

        return resultList;
    }

    /**
     * 根据作者查询书店内的书籍
     *
     * @param bookAuthor 书籍作者
     * @return
     */
    public static List<Book> selectBookByAuthor(String bookAuthor) {

        if (bookAuthor == null || bookAuthor.equals("")) {
            return null;
        }

        List<Book> resultBook = new ArrayList<>();

        for (Book book : bookStore.getBookList()) {
            if (bookAuthor.equals(book.getAuthor())) {
                resultBook.add(book);
            }
        }

        return resultBook;
    }


    /**
     * 根据id查询书店内的书籍
     *
     * @param bookId 书籍id
     * @return
     */
    public static Book selectBookById(int bookId) {

        for (Book book : bookStore.getBookList()) {
            if (bookId == book.getId()) {
                return book;
            }
        }
        return null;
    }

    /**
     * 购买店内的书籍
     *
     * @param bookId 书籍的id
     * @param number 购买数量
     * @return
     */
    public static boolean buyBook(int bookId, int number) {
        for (Book book : bookStore.getBookList()) {
            if (bookId == book.getId()) {
                if (book.getStatus() == 1 && book.getInventory() - number >= 0) {
                    book.setInventory(book.getInventory() - number);
                    return true;
                } else {
                    return false;
                }
            }
        }
        return false;
    }

    /**
     * 修改书籍的状态
     *
     * @param bookId 书籍的id
     * @param status 书籍的状态，0为下架，1为上架
     * @return
     */
    public static boolean updateBookStatus(int bookId, int status) {
        for (Book book : bookStore.getBookList()) {
            if (bookId == book.getId()) {
                book.setStatus(status);
                return true;
            }
        }
        return false;
    }
}