字符串的更改排序顺序包括特殊字符(例如"_") [英] Change sort order of strings includes with a special character (e.g. "_")

问题描述

PHP脚本以降序输出电子邮件地址列表，如下所示:

A PHP script outputs a list of e-mail addresses in descending order like following:

[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]

在Java中，我从这些电子邮件中创建一个ArrayList，然后以降序排序.结果是不同的:

In Java, I'm creating an ArrayList from these e-mails, then sorting in descending order. The result is different:

[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]
[e-mail]

差异是由下划线"_"引起的.我想实现与PHP脚本相同的排序顺序.我怎样才能做到这一点?我无法访问PHP代码.

The difference is caused by the underscore "_". I want to achieve the same sort order as the PHP script. How can I do this? I've no access to the PHP code.

我使用的Java测试代码是:

The Java test code I used is:

import java.util.ArrayList;
import java.util.Collections;

public class sorty {

    public static void main(String[] args) {
        ArrayList<String> listStrings = new ArrayList<>();

        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");
        listStrings.add("[e-mail]");

        for (int i = 0; i < listStrings.size(); i++) {

            System.out.println(listStrings.get(i));

        }

        Collections.sort(listStrings);
        Collections.reverse(listStrings);

        for (int i = 0; i < listStrings.size(); i++) {

            System.out.println(listStrings.get(i));

        }
        ;

    }

}

推荐答案

我会使用适当的 Collat​​or .实现自己的比较器不是最琐碎的事情.最好的是，如果您对默认值之一满意.例如

I would use an appropriate Collator. Implementing your own comparator isn't the most trivial thing. The nicest would be if you where happy with one of the defaults. e.g.

Collections.sort(listStrings, Collator.getInstance(Locale.US));

或类似.

如果没有一个适合您，则使用

If none of the existing ones works for you then using a rule based collator would make your intent clearer then implementing a comparator imo:

String rules = "< a < b < c < '_'" //etc
Collections.sort(listStrings, new RuleBasedCollator(rules));

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