如何在同一个类中创建2个可比较的方法？ [英] How do I make 2 comparable methods in only one class?

问题描述

我有一个类，我已经通过一个属性排序。
现在我需要做另一件事，我需要创建另一种方式来排序我的数据。
我如何做，所以我可以选择两种方法。
我知道的唯一命令是Collections.sort，它将从我想要比较其数据的类中选择compareTo方法。

I've got one class, that I sort it already by one attribute. Now I need to make another thing, that I need to create another way to sort my data. How can I make it, so I can choose between the two methods. The only command I know is Collections.sort that will pick up the method compareTo from the class I want to compare its data.

这是可能吗？

推荐答案

您需要做的是实现自定义 Comparator 。然后使用：

What you need to do is implement a custom Comparator. And then use:

Collections.sort(yourList, new CustomComparator<YourClass>());

< Comparator 。）

Collections.sort(yourList, new Comparator<YourClass>(){
    public int compare(YourClass one, YourClass two) {
        // compare using whichever properties of ListType you need
    }
});

如果你喜欢，你可以将它们构建到你的类中：

You could build these into your class if you like:

class YourClass {

    static Comparator<YourClass> getAttribute1Comparator() {
        return new Comparator<YourClass>() {
            // compare using attribute 1
        };
    }

    static Comparator<YourClass> getAttribute2Comparator() {
        return new Comparator<YourClass>() {
            // compare using attribute 2
        };
    }
}

可以这样使用：

Collections.sort(yourList, YourClass.getAttribute2Comparator());

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