通过公有的get/set方法实现属性的访问，其中：
- 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
- 限定作者、书名均为只读属性
public class BookTest {
// 测试方法
public static void main(String[] args) {
//实例化对象，调用相关方法实现运行效果
Book bk = new Book("红楼梦","曹雪芹");
bk.setPress("人民文学出版社");
bk.setPrice(10);
bk.showInfo();
System.out.println("===============");
Book bk2 = new Book("小李飞刀","古龙");
bk2.setPress("中国长安出版社");
bk2.setPrice(55.5);
bk2.showInfo();
}
}
public class Book {
//私有属性：书名、作者、出版社、价格
private String name,author,press;
private double price;
//通过构造方法实现属性赋值
public Book(){
}
public Book(String name,String author){
this.name = name;
this.author = author;
}
public void setPress(String press){
this.press = press;
}
public void setPrice(double price){
if(price<=10){
this.price=10;
System.out.println("图书价格最低10元");
}
else
this.price = price;
}
public String getName(){
return name;
}
public String getAuthor(){
return author;
}
public String getPress(){
return press;
}
public double getPrice(){
return price;
}
//信息介绍方法，描述图书所有信息
public void showInfo(){
System.out.println("书名:"+this.name);
System.out.println("作者:"+this.author);
System.out.println("出版社:"+this.press);
System.out.println("价格:"+this.price+"元");
}
}
