编一个封装良好的JavaBean类（无参和带参构造器，setter和getter），类名：Book；属性：String stuName、double price

public class Book {
private String stuName;
private double price;

public Book() {
// 无参构造器
}

public Book(String stuName, double price) {
// 带参构造器
this.stuName = stuName;
this.price = price;
}

public String getStuName() {
return stuName;
}

public void setStuName(String stuName) {
this.stuName = stuName;
}

public double getPrice() {
return price;
}

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