用Java代码打一个图书管理系统，要求有登录功能，增加功能，查找功能，删除功能，修改功能，窗口运行功能，同时代码要分类。

好的，我可以帮你实现一个简单的图书管理系统，以下是代码实现：

首先，我们需要创建一个`Book`类，用于表示一本书：

public class Book {
    private String name;
    private String author;
    private String publisher;
    private int price;
    private int stock;

    public Book(String name, String author, String publisher, int price, int stock) {
        this.name = name;
        this.author = author;
        this.publisher = publisher;
        this.price = price;
        this.stock = stock;
    }

    // getter 和 setter 方法省略
}

然后，我们创建一个`BookManager`类，用于管理图书的增加、查找、删除、修改等操作：

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

public class BookManager {
    private List<Book> bookList;

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

    // 添加图书
    public void addBook(Book book) {
        bookList.add(book);
    }

    // 根据书名查找图书
    public Book findBookByName(String name) {
        for (Book book : bookList) {
            if (book.getName().equals(name)) {
                return book;
            }
        }
        return null;
    }

    // 根据作者查找图书
    public List<Book> findBooksByAuthor(String author) {
        List<Book> result = new ArrayList<>();
        for (Book book : bookList) {
            if (book.getAuthor().equals(author)) {
                result.add(book);
            }
        }
        return result;
    }

    // 删除图书
    public void deleteBook(Book book) {
        bookList.remove(book);
    }

    // 修改图书信息
    public void updateBook(Book book) {
        Book oldBook = findBookByName(book.getName());
        if (oldBook != null) {
            oldBook.setAuthor(book.getAuthor());
            oldBook.setPublisher(book.getPublisher());
            oldBook.setPrice(book.getPrice());
            oldBook.setStock(book.getStock());
        }
    }

    // 获取所有图书信息
    public List<Book> getAllBooks() {
        return bookList;
    }
}

接下来，我们创建一个窗口界面类`BookWindow`，用于实现登录界面、添加、查找、删除、修改等功能：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class BookWindow extends JFrame {
    private JTextField nameField, authorField, publisherField, priceField, stockField;
    private JTextArea resultArea;
    private BookManager bookManager;

    public BookWindow() {
        // 窗口设置
        setTitle("图书管理系统");
        setLayout(new BorderLayout());
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 登录界面
        JPanel loginPanel = new JPanel(new GridLayout(3, 2));
        JTextField usernameField = new JTextField();
        JPasswordField passwordField = new JPasswordField();
        JButton loginButton = new JButton("登录");
        loginButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = usernameField.getText();
                String password = new String(passwordField.getPassword());
                if ("admin".equals(username) && "123456".equals(password)) {
                    showMainPanel();
                } else {
                    JOptionPane.showMessageDialog(BookWindow.this, "用户名或密码错误", "错误", JOptionPane.ERROR_MESSAGE);
                }
            }
        });
        loginPanel.add(new JLabel("用户名："));
        loginPanel.add(usernameField);
        loginPanel.add(new JLabel("密码："));
        loginPanel.add(passwordField);
        loginPanel.add(new JLabel(""));
        loginPanel.add(loginButton);
        add(loginPanel, BorderLayout.CENTER);

        // 主面板
        JPanel mainPanel = new JPanel(new BorderLayout());

        // 添加图书面板
        JPanel addPanel = new JPanel(new GridLayout(6, 2));
        nameField = new JTextField();
        authorField = new JTextField();
        publisherField = new JTextField();
        priceField = new JTextField();
        stockField = new JTextField();
        JButton addButton = new JButton("添加");
        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = nameField.getText();
                String author = authorField.getText();
                String publisher = publisherField.getText();
                int price = Integer.parseInt(priceField.getText());
                int stock = Integer.parseInt(stockField.getText());
                Book book = new Book(name, author, publisher, price, stock);
                bookManager.addBook(book);
                resultArea.setText("添加成功");
            }
        });
        addPanel.add(new JLabel("书名："));
        addPanel.add(nameField);
        addPanel.add(new JLabel("作者："));
        addPanel.add(authorField);
        addPanel.add(new JLabel("出版社："));
        addPanel.add(publisherField);
        addPanel.add(new JLabel("价格："));
        addPanel.add(priceField);
        addPanel.add(new JLabel("库存："));
        addPanel.add(stockField);
        addPanel.add(new JLabel(""));
        addPanel.add(addButton);

        // 查找图书面板
        JPanel searchPanel = new JPanel(new GridLayout(2, 2));
        JTextField searchField = new JTextField();
        JButton searchButton = new JButton("查找");
        searchButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = searchField.getText();
                Book book = bookManager.findBookByName(name);
                if (book != null) {
                    resultArea.setText(book.toString());
                } else {
                    resultArea.setText("未找到该图书");
                }
            }
        });
        searchPanel.add(new JLabel("输入书名："));
        searchPanel.add(searchField);
        searchPanel.add(new JLabel(""));
        searchPanel.add(searchButton);

        // 删除图书面板
        JPanel deletePanel = new JPanel(new GridLayout(2, 2));
        JTextField deleteField = new JTextField();
        JButton deleteButton = new JButton("删除");
        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String name = deleteField.getText();
                Book book = bookManager.findBookByName(name);
                if (book != null) {
                    bookManager.deleteBook(book);
                    resultArea.setText("删除成功");
                } else {
                    resultArea.setText("未找到该图书");
                }
            }
        });
        deletePanel.add(new JLabel("输入书名："));
        deletePanel.add(deleteField);
        deletePanel.add(new JLabel(""));
        deletePanel.add(deleteButton);

        // 修改图书面板
        JPanel updatePanel = new JPanel(new GridLayout(6, 2));
        JTextField oldNameField = new JTextField();
        JTextField newAuthorField = new JTextField();
        JTextField newPublisherField = new JTextField();
        JTextField newPriceField = new JTextField();
        JTextField newStockField = new JTextField();
        JButton updateButton = new JButton("修改");
        updateButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String oldName = oldNameField.getText();
                String newAuthor = newAuthorField.getText();
                String newPublisher = newPublisherField.getText();
                int newPrice = Integer.parseInt(newPriceField.getText());
                int newStock = Integer.parseInt(newStockField.getText());
                Book book = new Book(oldName, newAuthor, newPublisher, newPrice, newStock);
                bookManager.updateBook(book);
                resultArea.setText("修改成功");
            }
        });
        updatePanel.add(new JLabel("原书名："));
        updatePanel.add(oldNameField);
        updatePanel.add(new JLabel("新作者："));
        updatePanel.add(newAuthorField);
        updatePanel.add(new JLabel("新出版社："));
        updatePanel.add(newPublisherField);
        updatePanel.add(new JLabel("新价格："));
        updatePanel.add(newPriceField);
        updatePanel.add(new JLabel("新库存："));
        updatePanel.add(newStockField);
        updatePanel.add(new JLabel(""));
        updatePanel.add(updateButton);

        // 显示结果面板
        JPanel resultPanel = new JPanel(new BorderLayout());
        resultArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(resultArea);
        resultPanel.add(scrollPane, BorderLayout.CENTER);

        // 选项卡面板
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.addTab("添加图书", addPanel);
        tabbedPane.addTab("查找图书", searchPanel);
        tabbedPane.addTab("删除图书", deletePanel);
        tabbedPane.addTab("修改图书", updatePanel);
        mainPanel.add(tabbedPane, BorderLayout.CENTER);
        mainPanel.add(resultPanel, BorderLayout.SOUTH);

        // 创建图书管理器
        bookManager = new BookManager();

        // 将主面板添加到窗口中
        add(mainPanel, BorderLayout.CENTER);
    }

    // 显示主面板
    private void showMainPanel() {
        remove(getContentPane().getComponent(0));
        add(getContentPane().getComponent(1), BorderLayout.CENTER);
        revalidate();
        repaint();
    }

    public static void main(String[] args) {
        BookWindow window = new BookWindow();
        window.setVisible(true);
    }
}

以上就是实现一个简单的图书管理系统的代码，代码中实现了登录功能、添加图书功能、查找图书功能、删除图书功能、修改图书功能和窗口运行功能，并且将代码进行了分类。当然，这只是一个简单的示例，实际项目中还需要考虑更多的功能和安全性问题。