和交叉验证相似的方法有哪些
时间: 2023-11-01 09:07:44 浏览: 37
下面是一个示例的book类的代码:
```
public class Book implements Comparable<Book> {
private String name;
private double price;
public Book(String name, double price) {
this.name = name;
this.price = price;
}
public String getName() {
return name;
}
public double getPrice() {
return price;
}
@Override
public int compareTo(Book other) {
if (this.price < other.price) {
return -1;
} else if (this.price > other.price) {
return 1;
} else {
return ;
}
}
}
```
在主函数中,我们可以使用ArrayList来存放多个Book对象,然后创建一个新的Book对象,并使用contains方法来检查该对象是否与集合中的某个对象相等。示例代码如下:
```
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<Book> books = new ArrayList<>();
books.add(new Book("Java Programming", 29.99));
books.add(new Book("Python Programming", 24.99));
books.add(new Book("C++ Programming", 34.99));
Book newBook = new Book("Java Programming", 29.99);
if (books.contains(newBook)) {
System.out.println("The new book is already in the collection.");
} else {
System.out.println("The new book is not in the collection.");
}
}
}
```