双重比较器 [英] Comparator with double type

问题描述

嗨
我已经用stackoverflow帮助写了这个代码:)
但我的getX字段是双重的。我可以解决这个问题吗？
谢谢

Hi I have written this code with the stackoverflow help :) but my "getX" field is double .how can I solve this problem? thanks

代码：

public class NewClass2 implements Comparator<Point>
{
public int compare(Point p1, Point p2)
{
    return (int)(p1.getY() - p2.getY());
}


}

我需要比较（）return double not int。即，当3.2 - 3.1 = 0.1时，两个双数3.1和3.2
将被转换为int，差值将为0 !!!!

I need compare() return double not int. i.e., two double number "3.1" and "3.2" when 3.2 - 3.1 = 0.1 which will be cast to int and the difference will be 0!!!!

推荐答案

您不需要返回 double 。

比较器接口用于为要比较的元素建立排序。使用 double 的字段与此订单无关。

The Comparator interface is used to establish an ordering for the elements being compared. Having fields that use double is irrelevant to this ordering.

您的代码很好。 >

Your code is fine.

对不起，我错了，再次阅读这个问题，这就是你需要的：

Sorry, I was wrong, reading the question again, this is what you need:

public class NewClass2 implements Comparator<Point> {
    public int compare(Point p1, Point p2) {
        if (p1.getY() < p2.getY()) return -1;
        if (p1.getY() > p2.getY()) return 1;
        return 0;
    }    
}

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