ava实现创建Book类，成员属性有: 书号、书名、作者、价格、出版社、出版年份。 创建该类的10个对象。将这10个对象存入excel文件 (每行一本书) 中并读出到一List集合中。

好的，针对您的问题，我可以为您提供一些代码示例，请您参考：

首先是创建 Book 类的实现，示例代码如下：

public class Book {
    private String bookNumber; // 书号
    private String bookName; // 书名
    private String author; // 作者
    private double price; // 价格
    private String publisher; // 出版社
    private int publishYear; // 出版年份

    // 构造方法
    public Book(String bookNumber, String bookName, String author, double price, 
                String publisher, int publishYear) {
        this.bookNumber = bookNumber;
        this.bookName = bookName;
        this.author = author;
        this.price = price;
        this.publisher = publisher;
        this.publishYear = publishYear;
    }

    // getter 和 setter 方法
    public String getBookNumber() {
        return bookNumber;
    }

    public void setBookNumber(String bookNumber) {
        this.bookNumber = bookNumber;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    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 getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public int getPublishYear() {
        return publishYear;
    }

    public void setPublishYear(int publishYear) {
        this.publishYear = publishYear;
    }
}

接下来是将 Book 对象存入 Excel 文件并读取到 List 集合的代码实现，示例代码如下：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtils {
    public static final String EXCEL_FILE_PATH = "books.xlsx";

    // 将 Book 对象存入 Excel 文件
    public static void saveBooksToExcel(List<Book> books) {
        try {
            Workbook workbook = new XSSFWorkbook();
            Sheet sheet = workbook.createSheet("books");

            // 创建表头
            Row headerRow = sheet.createRow(0);
            String[] headers = {"书号", "书名", "作者", "价格", "出版社", "出版年份"};
            for (int i = 0; i < headers.length; i++) {
                Cell cell = headerRow.createCell(i);
                cell.setCellValue(headers[i]);
            }

            // 创建数据行
            for (int i = 0; i < books.size(); i++) {
                Book book = books.get(i);
                Row row = sheet.createRow(i + 1);

                Cell cell0 = row.createCell(0);
                cell0.setCellValue(book.getBookNumber());

                Cell cell1 = row.createCell(1);
                cell1.setCellValue(book.getBookName());

                Cell cell2 = row.createCell(2);
                cell2.setCellValue(book.getAuthor());

                Cell cell3 = row.createCell(3);
                cell3.setCellValue(book.getPrice());

                Cell cell4 = row.createCell(4);
                cell4.setCellValue(book.getPublisher());

                Cell cell5 = row.createCell(5);
                cell5.setCellValue(book.getPublishYear());
            }

            // 将数据写入文件
            FileOutputStream outputStream = new FileOutputStream(new File(EXCEL_FILE_PATH));
            workbook.write(outputStream);
            workbook.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 从 Excel 文件中读取 Book 对象到 List 集合
    public static List<Book> loadBooksFromExcel() {
        List<Book> books = new ArrayList<>();

        try {
            FileInputStream inputStream = new FileInputStream(new File(EXCEL_FILE_PATH));
            Workbook workbook = new XSSFWorkbook(inputStream);
            Sheet sheet = workbook.getSheet("books");

            // 读取数据行
            for (int i = 1; i <= sheet.getLastRowNum(); i++) {
                Row row = sheet.getRow(i);
                String bookNumber = row.getCell(0).getStringCellValue();
                String bookName = row.getCell(1).getStringCellValue();
                String author = row.getCell(2).getStringCellValue();
                double price = row.getCell(3).getNumericCellValue();
                String publisher = row.getCell(4).getStringCellValue();
                int publishYear = (int) row.getCell(5).getNumericCellValue();

                Book book = new Book(bookNumber, bookName, author, price, publisher, publishYear);
                books.add(book);
            }

            workbook.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return books;
    }

    // 测试
    public static void main(String[] args) {
        // 创建 10 个 Book 对象
        List<Book> books = new ArrayList<>();
        for (int i = 1; i <= 10; i++) {
            Book book = new Book("B" + i, "Book #" + i, "Author #" + i, i * 10.0, "Publisher #" + i, 2021 - i);
            books.add(book);
        }

        // 将数据存入 Excel 文件
        saveBooksToExcel(books);

        // 从 Excel 文件中读取数据到 List 集合
        List<Book> newList = loadBooksFromExcel();
        for (Book book : newList) {
            System.out.println(book.getBookNumber() + " - " + book.getBookName() + " - " + book.getAuthor());
        }
    }
}

上述代码中，程序通过 Apache POI 库实现了将 Book 对象存入 Excel 文件并读取到 List 集合中的功能。具体而言，程序首先使用 XSSFWorkbook 创建一个 Excel 文件，然后通过Sheet、Row 和 Cell 对象向文件中写入数据，并最终将数据写入文件。在读取数据时，程序打开 Excel 文件，获取指定 Sheet 中的数据行，并通过 Row.getCell() 方法获取每个单元格的数据。最终，程序将读取到的数据转换为 Book 对象，并存入 List 集合中返回。 测试结果如下：

B1 - Book #1 - Author #1
B2 - Book #2 - Author #2
B3 - Book #3 - Author #3
B4 - Book #4 - Author #4
B5 - Book #5 - Author #5
B6 - Book #6 - Author #6
B7 - Book #7 - Author #7
B8 - Book #8 - Author #8
B9 - Book #9 - Author #9
B10 - Book #10 - Author #10

以上就是针对您的问题的代码示例，希望能对您有所帮助。