import java.text.DecimalFormat;
import java.util.HashSet;
import java.util.Iterator;

class Book{
    private String bookName;
    private String author;
    private double price;
    
    public Book(String bookName, String author, double price){
        this.bookName = bookName;
        this.author = author;
        this.price = price;
    }
    
    public double getPrice(){
        return price;
    }
    
    @Override
    public String toString(){
        return bookName + "\t" + author + "\t" + price + "元";
    }  
}

public class Main{
    public static void main(String args[]){
        HashSet<Book> shoppingCart = new HashSet<Book>();
        //
        Book[] books = { new Book("《Java从入门到精通（第3版）》", "明日科技编著", 59.8), 
                        new Book("《Java从入门到精通（实例版）》", "明日科技编著", 69.8), 
                        new Book("《Java Web从入门到精通》　　  ", "明日科技编著", 69.8)};
        //
        shoppingCart.add(books[0]);
        shoppingCart.add(books[1]);
        shoppingCart.add(books[2]);
        Iterator<Book> it = shoppingCart.iterator();
        System.out.println("您的购物车里的商品信息：\n书名\t\t\t作者（团队）\t价格");
        System.out.println("———————————————————————————————————————————————————————");
        while(it.hasNext()){
            System.out.println(it.next());
        }
        System.out.println("———————————————————————————————————————————————————————");
        double sumMoney = books[0].getPrice() + books[1].getPrice() + books[2].getPrice(); 
        DecimalFormat pattern = new DecimalFormat("##.##");
        String result = pattern.format(sumMoney);
        System.out.println("合计：\t\t\t\t\t\t" + result + "元\n\t\t\t\t\t\t—→点我去结账");
    }
}