public class Book {
	String title;
	String author;
	int price;
	
	public Book() {
		this.title="タイトル未設定";
		this.author="著者未設定";
		this.price=0;
	}
	public Book(String title,String author,int price) {
		this.title=title;
		this.author=author;
		this.price=price;
	}
}