各位java程序员，help me

用java创建一个类Book，在Book中有String类型的属性name，author，有double类型的属性price，定构造方法带三个参数，给三个属性赋值。定义方法printBookInfo()输出三个属性的值。 创建测试类TestBook，生成Book对象b1，调用printBookInfo()方法

public class Book {
    private String name;
    private String author;
    private double price;
    
    public Book(String name, String author, double price) {
        this.name = name;
        this.author = author;
        this.price = price;
    }
    
    public void printBookInfo() {
        System.out.println("书名：" + name);
        System.out.println("作者：" + author);
        System.out.println("价格：" + price);
    }
}

public class TestBook {
    public static void main(String[] args) {
        Book b1 = new Book("大话西游", "周星驰", 99.9);
        b1.printBookInfo();
    }
}