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；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
public class Book {
// 设置属性的私有访问权限
private String name;
private String author;
private String publisher;
private double price;
// 通过公有的get,set方法实现对属性的访问
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
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) {
if (price > 10) {
this.price = price;
}else{
System.out.println("价格无效,必须大于10");
}
}
// 无参构造方法
public Book() {
}
// 有参构造方法 实现属性赋值
public Book(String name, String author, String publisher, double price) { // 有四个参构造方法
this.name = name;
this.author = author;
this.publisher = publisher;
this.setPrice(price);
}
public void information() { // 展示信息的方法
System.out.println("书名:" + this.getName());
System.out.println("作者:" + this.getAuthor());
System.out.println("出版社:" + publisher);
System.out.println("价格:" + price + "元");
}
}
public class TestBook {
public static void main(String[] args) {
Book b1 = new Book("鹿鼎记", "金庸", "人民文学出版社", 120.0); // 创建对象的同时给属性赋值
(); // 对象调用方法
System.out.println("===================");
Book b2 = new Book("绝代双骄", "古龙", "中国长安出版社", 55.5);
();
}
}