用java编写一个图书管理系统

好的，下面是一个简单的图书管理系统的 JAVA 代码示例：

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

class Book {
    private int id;
    private String title;
    private String author;
    private boolean available;

    public Book(int id, String title, String author, boolean available) {
        this.id = id;
        this.title = title;
        this.author = author;
        this.available = available;
    }

    public int getId() {
        return id;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public boolean isAvailable() {
        return available;
    }

    public void setAvailable(boolean available) {
        this.available = available;
    }
}

class Library {
    private ArrayList<Book> books;

    public Library(ArrayList<Book> books) {
        this.books = books;
    }

    public ArrayList<Book> getBooks() {
        return books;
    }

    public void setBooks(ArrayList<Book> books) {
        this.books = books;
    }

    public void addBook(Book book) {
        books.add(book);
    }

    public void removeBook(int id) {
        for (int i = 0; i < books.size(); i++) {
            if (books.get(i).getId() == id) {
                books.remove(i);
                break;
            }
        }
    }

    public void displayBooks() {
        System.out.println("ID\tTitle\tAuthor\tAvailable");
        for (Book book : books) {
            System.out.println(book.getId() + "\t" + book.getTitle() + "\t" + book.getAuthor() + "\t" + book.isAvailable());
        }
    }
}

public class BookManagementSystem {
    public static void main(String[] args) {
        ArrayList<Book> books = new ArrayList<>();
        books.add(new Book(1, "Java Programming", "John Smith", true));
        books.add(new Book(2, "Python Programming", "Jane Doe", false));
        books.add(new Book(3, "C++ Programming", "Bob Johnson", true));
        Library library = new Library(books);

        Scanner scanner = new Scanner(System.in);
        int choice;
        do {
            System.out.println("1. Add book");
            System.out.println("2. Remove book");
            System.out.println("3. Display books");
            System.out.println("0. Exit");
            System.out.print("Enter your choice: ");
            choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.print("Enter book ID: ");
                    int id = scanner.nextInt();
                    scanner.nextLine(); // Consume newline character
                    System.out.print("Enter book title: ");
                    String title = scanner.nextLine();
                    System.out.print("Enter book author: ");
                    String author = scanner.nextLine();
                    library.addBook(new Book(id, title, author, true));
                    break;

                case 2:
                    System.out.print("Enter book ID: ");
                    id = scanner.nextInt();
                    library.removeBook(id);
                    break;

                case 3:
                    library.displayBooks();
                    break;

                case 0:
                    break;

                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        } while (choice != 0);

        scanner.close();
    }
}

该示例包含两个类：`Book` 和 `Library`。`Book` 类表示一本书，包括 ID、标题、作者和可用性等属性。`Library` 类表示一个图书馆，包括一个 `ArrayList` 类型的书籍列表，以及添加、删除和显示书籍的方法。`BookManagementSystem` 类是主类，它创建一个图书馆对象，并提供一个简单的菜单进行添加、删除和显示书籍。