将他们结合成完整的代码

好的，下面是结合你提供的要求的完整代码示例：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;

class Book {
    private String name; // 书名
    private String author; // 作者
    private double price; // 价格
    private int num; // 库存数量

    // 构造方法
    public Book(String name, String author, double price, int num) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.num = num;
    }

    // 获取书名
    public String getName() {
        return name;
    }

    // 获取作者
    public String getAuthor() {
        return author;
    }

    // 获取价格
    public double getPrice() {
        return price;
    }

    // 获取库存数量
    public int getNum() {
        return num;
    }

    // 设置库存数量
    public void setNum(int num) {
        this.num = num;
    }

    // 判断两本书是否相同
    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Book other = (Book) obj;
        if (name == null) {
            if (other.name != null) {
                return false;
            }
        } else if (!name.equals(other.name)) {
            return false;
        }
        if (author == null) {
            if (other.author != null) {
                return false;
            }
        } else if (!author.equals(other.author)) {
            return false;
        }
        return true;
    }

    // 显示图书信息
    @Override
    public String toString() {
        return "书名：" + name + "，作者：" + author + "，价格：" + price + "，库存数量：" + num;
    }
}

class BookStore {
    private ArrayList<Book> books = new ArrayList<Book>();

    // 显示全部图书信息
    public void displayAllBooks() {
        System.out.println("所有图书信息如下：");
        if (books.size() == 0) {
            System.out.println("暂无图书信息！");
            return;
        }
        Iterator<Book> it = books.iterator();
        while (it.hasNext()) {
            System.out.println(it.next());
        }
    }

    // 根据书名查找图书
    public void searchBookByName(String name) {
        System.out.println("查找结果如下：");
        boolean flag = false;
        Iterator<Book> it = books.iterator();
        while (it.hasNext()) {
            Book b = it.next();
            if (b.getName().equals(name)) {
                System.out.println(b);
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("没有找到相关图书信息！");
        }
    }

    // 卖书
    public void sellBook(String name, int num) {
        boolean flag = false;
        Iterator<Book> it = books.iterator();
        while (it.hasNext()) {
            Book b = it.next();
            if (b.getName().equals(name)) {
                if (b.getNum() >= num) {
                    b.setNum(b.getNum() - num);
                    System.out.println("购买成功！");
                } else {
                    System.out.println("库存不足，购买失败！");
                }
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("没有找到相关图书信息！");
        }
    }

    // 新进书
    public void addNewBook(Book book) {
        if (books.contains(book)) {
            Iterator<Book> it = books.iterator();
            while (it.hasNext()) {
                Book b = it.next();
                if (b.equals(book)) {
                    b.setNum(b.getNum() + book.getNum());
                    System.out.println("图书已存在，库存已更新！");
                    return;
                }
            }
        } else {
            books.add(book);
            System.out.println("图书已添加！");
        }
    }
}

public class BookStoreManagementSystem {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        BookStore bookStore = new BookStore();

        while (true) {
            System.out.println("欢迎使用图书管理系统！");
            System.out.println("1. 显示全部图书信息");
            System.out.println("2. 根据书名查找图书");
            System.out.println("3. 卖书");
            System.out.println("4. 新进书");
            System.out.println("0. 退出系统");
            System.out.print("请选择要进行的操作：");
            int choice = input.nextInt();

            switch (choice) {
                case 1:
                    bookStore.displayAllBooks();
                    break;
                case 2:
                    System.out.print("请输入要查找的书名：");
                    String name = input.next();
                    bookStore.searchBookByName(name);
                    break;
                case 3:
                    System.out.print("请输入要卖出的书名：");
                    String name1 = input.next();
                    System.out.print("请输入要卖出的数量：");
                    int num = input.nextInt();
                    bookStore.sellBook(name1, num);
                    break;
                case 4:
                    System.out.print("请输入新进的书名：");
                    String name2 = input.next();
                    System.out.print("请输入新进的作者：");
                    String author = input.next();
                    System.out.print("请输入新进的价格：");
                    double price = input.nextDouble();
                    System.out.print("请输入新进的数量：");
                    int num1 = input.nextInt();
                    Book book = new Book(name2, author, price, num1);
                    bookStore.addNewBook(book);
                    break;
                case 0:
                    System.out.println("感谢使用图书管理系统！");
                    System.exit(0);
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }
}

请注意，以上代码仅作为示例，可能需要根据实际情况进行修改和完善。