Java Japanese (Kanji) Sort

I wasn't in charge of it, but in the past I had a problem because I couldn't reproduce the special platform-dependent sorting in the program porting project (COBOL-> Java).

If you look up the sorting of characters by the remnants of that time I read an interesting article when I was looking around the sort of Collection.

I tried to find out why Chinese numerals are not sorted in numerical order --give IT a try

Java or a normal system doesn't seem to provide sorting of Chinese numerals.

Sorting

String[] KanjiNumbers = {"one","two","three","four","Five","Six","Seven","Eight","Nine"};
List<String> stringList = Arrays.asList(KanjiNumbers);
		
Collections.sort(stringList);//sort
System.out.println(stringList);//display

result

[one,Seven,three,Nine,two,Five,Eight,Six,four]

If you use Collections # sort (), it will be lined up with 1,7,3 ... As a result of investigation, it seems that it is arranged in Unicode order by default

Try using a class called the Collator class that can prepare a Comparator for each locale. Collator (Java Platform SE 8 ) When I prepared a sort for Japanese here, the kanji became the reading order.

Sort by Japanese locale

Collator collator = Collator.getInstance(Locale.JAPAN);
Collections.sort(stringList,collator);
System.out.println(stringList);

result

[one,Nine,Five,three,four,Seven,two,Eight,Six]

I'm not sure, but I think they are lined up according to this rule [Japanese character string collation](https://ja.wikipedia.org/wiki/%E6%97%A5%E6%9C%AC%E8%AA%9E%E6%96%87%E5%AD% 97% E5% 88% 97% E7% 85% A7% E5% 90% 88% E9% A0% 86% E7% 95% AA)

According to the opening article, shift_jis are arranged in this order.

Relation

Only Japanese has different Excel sort and Java sort order A story that seems to have struggled. http://stackoverflow.com/questions/20612110/sort-japanese-data-in-java

It seems difficult to reproduce Japanese sort on another platform

Books etc.

Books often cited during the search (personal notes)

Introduction to character code technology for programmers Java International Programming