java封装练习

ゝ一纸荒年。 2022-11-19 04:29 92阅读 0赞

## java封装练习 ##

/**
     * 以面向对象的思想，编写自定义类描述图书信息。设定属性包括：书名、作者、出版社名、价格
     * 方法包括：信息介绍
     *
     * 要求：
     * 1、设置属性的私有访问权限，通过公有的get、set方法实现对属性的访问
     * 2、限定价格必须大于10，如果无效进行提示
     * 3、设计构造方法实现对属性赋值
     * 4、信息介绍方法描述图书所有信息
     * 5、编写测试类，测试对图书类的对象及相关方法（测试数据信息自定）
     */
    public class Book {
        private String bookName;
        private String author;
        private String publisher;
        private double price;
    
        public Book(){
        }
    
        public Book(String bookName,String author,String publisher,double price){
            this.bookName = bookName;
            this.author = author;
            this.publisher = publisher;
            this.price = price;
        }
    
        public void setBookName(String bookName){
            this.bookName = bookName;
        }
    
        public String getBookName(){
            return this.bookName;
        }
    
        public void setAuthor(String author){
            this.author = author;
        }
    
        public String getAuthor(){
            return author;
        }
    
        public void setPublisher(String publisher) {
            this.publisher = publisher;
        }
    
        public String getPublisher() {
            return publisher;
        }
    
        public void setPrice(double price){
            if (price<10){
                this.price = 10;
                System.out.println("价格必须大于10元，默认10元");
            }else {
                this.price = price;
            }
        }
    
        public double getPrice(){
            return this.price;
        }
    
        public void show(){
            System.out.println("bookName:"+bookName+"\t"+"author:"+author+"\t"+"publisher:"+publisher+"\t"+"price:"+price);
        }
    
        public static void main(String[] args) {
            Book book1 = new Book();
            book1.setBookName("西游记");
            book1.setAuthor("吴承恩");
            book1.setPublisher("清华大学出版社");
            book1.setPrice(6);
            book1.show();
    
            Book book2 = new Book("红楼梦","曹雪芹","清华大学出版社",30);
            book2.show();
        }
    
    }

执行代码如下：

![20210414164458544.png][]

[20210414164458544.png]: /images/20221022/1e2e28c8e25e40f9b04a4f376b36eb93.png