public class book {
    //私有属性：书名、作者、出版社、价格

    //通过构造方法实现属性赋值

    /*通过公有的get/set方法实现属性的访问，其中：
    1、限定图书价格必须大于10，如果无效需进行提示，并强制赋值为10
    2、限定作者、书名均为只读属性
    */

    //信息介绍方法，描述图书所有信息
    private String bookName;
    private String author;
    private String publisher;
    private double price;

    public book(String bookName,String author,String publisher,double price){

        this.bookName = bookName;
        this.author = author;
        this.publisher = publisher;
        this.price = price;
    }

    public String getAuthor() {
        return author;
    }

    public String getBookName() {
        return bookName;
    }

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

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        if (price<10) {
            System.out.println("图书价格必须大于10元");
            this.price = 10;
        }else
            this.price = price;
    }
    public void info(){
        System.out.println("书名:"+getBookName()+"\n"+"作者:"+getAuthor()+"\n"+"出版社:"+getPublisher()+"\n"+"价格:"+getPrice());
    }
}
public class BookTest {
    public static void main(String[] args) {
        book book_info1 = new book("红楼梦","曹雪芹","人民文学出版社",1.0);
        book_info1.info();
        System.out.println(book_info1.getBookName());
        System.out.println("==================================");
        book book_info2 = new book("小李飞刀","古龙","中国长安出版社",55.5);
        book_info2.info();
        book_info1.setPrice(1);
        System.out.println(book_info1.getPrice());
    }
}