Comparable接口的实现：源代码

无论什么情况，只要是一组对象要排序，对象所在的类一定要实现Comparable接口

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源代码：

import java.util.Arrays;

class Book implements Comparable<Book>{  //实现比较
    private String title ;
    private double price ;
    public Book(String title,double price){
        this.title = title ;
        this.price = price ;
    }
    @Override
    public String toString() {
        return "书名："+this.title +",价格："+ this.price + "\n";
    }
    @Override
    public int compareTo(Book o) {  //Arrays.sort()会自动调用方法比较
        if (this.price > o.price) {
            return 1 ;
        } else if (this.price < o.price) {
            return -1 ;
        }else {
            return 0 ;  
        }

    }
}
public class TestDemo {
    public static void main(String[] args){ 
        Book books[] = new Book[]{
            new Book("Java开发",79.2),
            new Book("J开发",78.2),
            new Book("Ja开发",77.2),
            new Book("Jav开发",76.2)
        };
        Arrays.sort(books);
        System.out.println(Arrays.toString(books));
    }
}

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