根据价格或书名长度排序，调用接口实现

package October;

import java.util.Arrays;
import java.util.Comparator;

public class Common {
    public static void main(String[] args) {
        Book[] books = new Book[4];
        books[0]=new Book("三国演义",111);
        books[1]=new Book("水浒传",222);
        books[2]=new Book("西游记",333);
        books[3]=new Book("红楼梦",444);

        //调用Arrays.sort方法，通过接口实现排序
        Arrays.sort(books, new Comparator() {
            @Override
            public int compare(Object o1, Object o2) {
                //向下转型
                Book i1 = (Book)o1;
                Book i2 = (Book)o2;
                
                //按照价格由小到大排序
                //return (int)(i1.getPrice()-i2.getPrice());
                
                //按照书名长度由短到长排序
                return (int)(i1.getName().length()-i2.getName().length());
            }
        });
        System.out.println(Arrays.toString(books));
    }
}
class Book{
    public 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 String toString() {
        return "name=" + name + ",price=" + price+"n" ;
    }
}