根据下列类图，设计Book类：
【输入形式】
无
【输出形式】
(default, noname, 50.0)
(java, lixinghua, 89.9)
(java, ligang, 101.8)
【样例输入】
【样例输出】
【样例说明】
【评分标准】
class Book{
private String title,author;
private double price;
public Book(){
this.title=”default”;
this.author=”noname”;
this.price=50.0;
}
public Book(String title,String author,double price){
this.title=title;
this.author=author;
this.price=price;
}
public String getTitle(){
return this.title;
}
public void setTitle(String title){
this.title=title;
}
public String getAuthor(){
return this.author;
}
public void setAuthor(String author){
this.author=author;
}
public double getPrice(){
return this.price;
}
public void setPrice(double price){
this.price=price;
}
public String toString(){
return “(“+this.title+”, “+this.author+”, “+this.price+”)”;
}
}
public class BookApp {
public static void main(String[] args) {
Book book1=new Book();
Book book2=new Book(“java”,”lixinghua”,89.9);
System.out.println(book1);
System.out.println(book2);
book1.setAuthor(“ligang”);
book1.setTitle(“java”);
book1.setPrice(101.8);
System.out.println(book1);
}
}