字符串的更改排序顺序包括特殊字符(例如"

本文介绍了字符串的更改排序顺序包括特殊字符(例如"_")的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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:

_abc_@testmail _abc45_@testmail _abc2_@testmail ypaux2aux@yahoo yaremchuk56@testmail vasillevn@hotmail ugur@hotmail twes@gmail tukaux@yahoo ttsetaux1@yahoo tra@testmail

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:

ypaux2aux@yahoo yaremchuk56@testmail vasillevn@hotmail ugur@hotmail twes@gmail tukaux@yahoo ttsetaux1@yahoo tra@testmail _abc45_@testmail _abc2_@testmail _abc_@testmail

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("_abc_@testmail"); listStrings.add("_abc45_@testmail"); listStrings.add("_abc2_@testmail"); listStrings.add("ypaux2aux@yahoo"); listStrings.add("yaremchuk56@testmail"); listStrings.add("vasillevn@hotmail"); listStrings.add("ugur@hotmail"); listStrings.add("twes@gmail"); listStrings.add("tukaux@yahoo"); listStrings.add("ttsetaux1@yahoo"); listStrings.add("tra@testmail"); 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，则使用基于规则的整理程序将使您的意图清除器，然后实施一个比较器imo:

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));