java实现键盘输入n本书,按照价格从低到高输出,如果价格相同则按照书名的自然顺序排序
时间: 2023-11-09 19:07:37 浏览: 46
可以使用Java中的TreeMap来实现按照价格从低到高排序,如果价格相同则按照书名的自然顺序排序。具体代码如下:
```java
import java.util.Scanner;
import java.util.TreeMap;
public class BookSort {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入书的数量:");
int n = scanner.nextInt();
TreeMap<Book, Integer> map = new TreeMap<>();
for (int i = 0; i < n; i++) {
System.out.print("请输入第" + (i + 1) + "本书的价格和书名:");
int price = scanner.nextInt();
String name = scanner.next();
Book book = new Book(price, name);
map.put(book, i);
}
for (Book book : map.keySet()) {
System.out.println(book);
}
}
}
class Book implements Comparable<Book> {
private int price;
private String name;
public Book(int price, String name) {
this.price = price;
this.name = name;
}
public int getPrice() {
return price;
}
public String getName() {
return name;
}
@Override
public int compareTo(Book o) {
if (this.price != o.price) {
return this.price - o.price;
} else {
return this.name.compareTo(o.name);
}
}
@Override
public String toString() {
return "Book{" +
"price=" + price +
", name='" + name + '\'' +
'}';
}
}
```
运行程序,输入书的数量和每本书的价格和书名,程序会按照价格从低到高输出书的信息。