用java语言编写在包xhu.soft中定义一个教材类，包含编号、书名、作者、出版社和价格等属性，要求能用构造方法初始化图书 信息；同时能修改图书的各信息。然后在包xhu.test包中编写图书的测试类，输出图书信息。

在Java中，我们首先会在`xhu.soft`包下定义一个名为`Book`的类，它将包含图书的基本信息：

package xhu.soft;

public class Book {
    private String bookId;
    private String title;
    private String author;
    private String publisher;
    private double price;

    // 构造方法，用于初始化图书信息
    public Book(String bookId, String title, String author, String publisher, double price) {
        this.bookId = bookId;
        this.title = title;
        this.author = author;
        this.publisher = publisher;
        this.price = price;
    }

    // getter和setter方法
    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

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

    public String getPublisher() {
        return publisher;
    }

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

    public double getPrice() {
        return price;
    }

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

接着，在`xhu.test`包下的`BookTest`类中，我们将测试`Book`类的功能：

package xhu.test;

import xhu.soft.Book;

public class BookTest {
    public static void main(String[] args) {
        // 创建一个新的Book实例
        Book book1 = new Book("001", "Java编程入门", "张三", "人民邮电出版社", 59.9);

        // 输出初始信息
        System.out.println("Book ID: " + book1.getBookId());
        System.out.println("Title: " + book1.getTitle());
        System.out.println("Author: " + book1.getAuthor());
        System.out.println("Publisher: " + book1.getPublisher());
        System.out.println("Price: " + book1.getPrice());

        // 修改信息并再次输出
        book1.setTitle("Java高级编程");
        book1.setPrice(79.9);
        System.out.println("\nModified Information:");
        System.out.println("Title: " + book1.getTitle());
        System.out.println("Price: " + book1.getPrice());
    }
}

在这个例子中，我们在`BookTest`中创建了一个`Book`对象，设置了初始信息并输出，然后又更改了部分信息并再次展示了结果。