要求单价输出为整数，代码应该怎么改

好的，如果要求单价输出为整数，可以将`Book`类中的价格属性`price`改为整型`int`类型，然后将读入价格的代码修改为读入整数。同时，在输出单价时，使用`System.out.printf()`方法，指定输出格式为整数即可。下面是修改后的代码：

import java.util.*;

class Book {
    private String type;
    private String name;
    private int price;
    private String uniqueProperty;

    public Book(String type, String name, int price, String uniqueProperty) {
        this.type = type;
        this.name = name;
        this.price = price;
        this.uniqueProperty = uniqueProperty;
    }

    public String getType() {
        return type;
    }

    public String getName() {
        return name;
    }

    public int getPrice() {
        return price;
    }

    public String getUniqueProperty() {
        return uniqueProperty;
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Book> books = new ArrayList<>();

        int n = scanner.nextInt();
        for (int i = 0; i < n; i++) {
            String type = scanner.next();
            String name = scanner.next();
            int price = scanner.nextInt();
            String uniqueProperty = scanner.next();
            books.add(new Book(type, name, price, uniqueProperty));
        }

        String queryType = scanner.next();
        boolean found = false;
        for (Book book : books) {
            if (book.getType().equals(queryType)) {
                System.out.printf("书名: %s, 单价: %d, 独有属性: %s\n", book.getName(), book.getPrice(), book.getUniqueProperty());
                found = true;
            }
        }
        if (!found) {
            System.out.println("Don't have this kind of book");
        }
    }
}

这里使用了`System.out.printf()`方法，格式化输出书名、单价和独有属性。`%s`表示输出字符串，`%d`表示输出整数。在输出单价时，使用`%d`格式化输出。