通过java基础写一个图书馆管理系统

好的，下面是一个简单的图书馆管理系统的Java代码：

import java.util.*;

class Book {
    private String title;
    private String author;
    private int numCopies;

    public Book(String title, String author, int numCopies) {
        this.title = title;
        this.author = author;
        this.numCopies = numCopies;
    }

    public String getTitle() {
        return title;
    }

    public String getAuthor() {
        return author;
    }

    public int getNumCopies() {
        return numCopies;
    }

    public void setNumCopies(int numCopies) {
        this.numCopies = numCopies;
    }

    public void display() {
        System.out.println("Title: " + title);
        System.out.println("Author: " + author);
        System.out.println("Number of Copies: " + numCopies);
    }
}

class Library {
    private String name;
    private ArrayList<Book> books = new ArrayList<Book>();

    public Library(String name) {
        this.name = name;
    }

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

    public void displayBooks() {
        for (Book book : books) {
            book.display();
        }
    }

    public void borrowBook(String title) {
        for (Book book : books) {
            if (book.getTitle().equals(title)) {
                if (book.getNumCopies() > 0) {
                    book.setNumCopies(book.getNumCopies() - 1);
                    System.out.println("You have borrowed the book " + title + ".");
                } else {
                    System.out.println("Sorry, all copies of the book " + title + " are currently checked out.");
                }
                return;
            }
        }
        System.out.println("Sorry, the book " + title + " is not available in this library.");
    }

    public void returnBook(String title) {
        for (Book book : books) {
            if (book.getTitle().equals(title)) {
                book.setNumCopies(book.getNumCopies() + 1);
                System.out.println("You have returned the book " + title + ".");
                return;
            }
        }
        System.out.println("Sorry, the book " + title + " is not part of this library's collection.");
    }
}

public class LibrarySystem {
    public static void main(String[] args) {
        Library library = new Library("My Library");

        Book book1 = new Book("The Catcher in the Rye", "J.D. Salinger", 3);
        Book book2 = new Book("To Kill a Mockingbird", "Harper Lee", 2);
        Book book3 = new Book("1984", "George Orwell", 5);

        library.addBook(book1);
        library.addBook(book2);
        library.addBook(book3);

        System.out.println("Welcome to " + library.name + ".");
        System.out.println("Here are the available books:");
        library.displayBooks();

        library.borrowBook("1984");
        library.borrowBook("1984");
        library.borrowBook("1984");

        library.borrowBook("Animal Farm");

        library.returnBook("1984");
        library.returnBook("1984");
        library.returnBook("1984");

        System.out.println("Here are the available books:");
        library.displayBooks();
    }
}

这个代码实现了一个简单的图书馆管理系统。`Book`类表示一本书，包括书名、作者和副本数。`Library`类表示整个图书馆，包括图书馆名称和书籍列表。它包括了添加书籍、展示书籍、借出书籍和归还书籍等方法。`LibrarySystem`类是程序的入口，它创建了一个图书馆实例并添加了一些书籍，然后展示了所有可用的书籍，并模拟了借书和还书的过程。