用Java实现1、图书管理 图书类：图书编号、图书名称、作者、单价、类别 使用集合存储多本图书信息，要求实现以下几个功能： 1）、查询图书 1.1）、查询所有 1.2）、根据编号查询 1.3）、根据书名模糊查询 1.4）、根据作者查询 1.5）、根据类型查询 2）、新增图书 要求用户输入图书信息，图书编号必须要判断是否已经存在 3）、修改图书 要求用户输入图书编号，展示该图书所有信息，询问用户是否修改？ 要求用户输入修改信息（不能修改编号），实现修改操作 4）、删除图书 要求用户输入图书编号，展示该图书所有信息，询问用户是否删除？

以下是用Java实现图书管理的代码：

图书类Book.java：

public class Book {
    private String id;
    private String name;
    private String author;
    private double price;
    private String category;

    public Book(String id, String name, String author, double price, String category) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.price = price;
        this.category = category;
    }

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getAuthor() {
        return author;
    }

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

    public double getPrice() {
        return price;
    }

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

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    @Override
    public String toString() {
        return "图书编号：" + id + "\n图书名称：" + name + "\n作者：" + author + "\n单价：" + price + "\n类别：" + category;
    }
}

图书管理类BookManager.java：

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

public class BookManager {
    private List<Book> bookList;

    public BookManager() {
        bookList = new ArrayList<>();
    }

    // 查询所有图书
    public void queryAll() {
        System.out.println("所有图书信息如下：");
        for (Book book : bookList) {
            System.out.println(book);
            System.out.println("--------------------");
        }
    }

    // 根据编号查询图书
    public void queryById() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询的图书编号：");
        String id = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("未找到该编号对应的图书！");
        }
    }

    // 根据书名模糊查询图书
    public void queryByName() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询的图书名称关键字：");
        String keyword = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getName().contains(keyword)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                System.out.println("--------------------");
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("未找到包含该关键字的图书！");
        }
    }

    // 根据作者查询图书
    public void queryByAuthor() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询的作者名称：");
        String author = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getAuthor().equals(author)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                System.out.println("--------------------");
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("未找到该作者的图书！");
        }
    }

    // 根据类型查询图书
    public void queryByCategory() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询的图书类型：");
        String category = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getCategory().equals(category)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                System.out.println("--------------------");
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("未找到该类型的图书！");
        }
    }

    // 新增图书
    public void addBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要新增的图书信息：");
        System.out.print("编号：");
        String id = scanner.next();
        // 判断编号是否已存在
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                System.out.println("该编号已存在，请重新输入！");
                addBook();
                return;
            }
        }
        System.out.print("名称：");
        String name = scanner.next();
        System.out.print("作者：");
        String author = scanner.next();
        System.out.print("单价：");
        double price = scanner.nextDouble();
        System.out.print("类别：");
        String category = scanner.next();
        Book book = new Book(id, name, author, price, category);
        bookList.add(book);
        System.out.println("新增成功！");
    }

    // 修改图书
    public void modifyBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要修改的图书编号：");
        String id = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                System.out.println("--------------------");
                System.out.println("是否要修改该图书信息？（y/n）");
                String choice = scanner.next();
                if (choice.equals("y")) {
                    System.out.println("请输入要修改的信息（除了编号以外的其他信息）：");
                    System.out.print("名称：");
                    String name = scanner.next();
                    System.out.print("作者：");
                    String author = scanner.next();
                    System.out.print("单价：");
                    double price = scanner.nextDouble();
                    System.out.print("类别：");
                    String category = scanner.next();
                    book.setName(name);
                    book.setAuthor(author);
                    book.setPrice(price);
                    book.setCategory(category);
                    System.out.println("修改成功！");
                }
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("未找到该编号对应的图书！");
        }
    }

    // 删除图书
    public void deleteBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除的图书编号：");
        String id = scanner.next();
        boolean flag = false;
        for (Book book : bookList) {
            if (book.getId().equals(id)) {
                System.out.println("查询结果如下：");
                System.out.println(book);
                System.out.println("--------------------");
                System.out.println("是否要删除该图书？（y/n）");
                String choice = scanner.next();
                if (choice.equals("y")) {
                    bookList.remove(book);
                    System.out.println("删除成功！");
                }
                flag = true;
                break;
            }
        }
        if (!flag) {
            System.out.println("未找到该编号对应的图书！");
        }
    }
}

主程序Main.java：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        BookManager bookManager = new BookManager();
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1、查询图书");
            System.out.println("2、新增图书");
            System.out.println("3、修改图书");
            System.out.println("4、删除图书");
            System.out.println("0、退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    System.out.println("请选择查询方式：");
                    System.out.println("1、查询所有");
                    System.out.println("2、根据编号查询");
                    System.out.println("3、根据书名模糊查询");
                    System.out.println("4、根据作者查询");
                    System.out.println("5、根据类型查询");
                    int queryChoice = scanner.nextInt();
                    switch (queryChoice) {
                        case 1:
                            bookManager.queryAll();
                            break;
                        case 2:
                            bookManager.queryById();
                            break;
                        case 3:
                            bookManager.queryByName();
                            break;
                        case 4:
                            bookManager.queryByAuthor();
                            break;
                        case 5:
                            bookManager.queryByCategory();
                            break;
                        default:
                            System.out.println("输入有误！");
                            break;
                    }
                    break;
                case 2:
                    bookManager.addBook();
                    break;
                case 3:
                    bookManager.modifyBook();
                    break;
                case 4:
                    bookManager.deleteBook();
                    break;
                case 0:
                    System.out.println("谢谢使用！");
                    System.exit(0);
                default:
                    System.out.println("输入有误！");
                    break;
            }
        }
    }
}