Java. Text. collator

Source: Internet
Author: User
Tags collator

Collator is used to simplify our processing of differences between different languages. Collator mainly deals:

    • Normalized typical equivalent characters
    • Multi-level comparison

Compare Java strings by comparing the Unicode byte code point. This will mean that in UnicodeCodeThe sorting weight specified by the chart character position, but this is not the case. The language may have identical characters and different sorting weights.

For example, if you do not understand German, you may want to sort (\ u00df) as B or B, but in fact it is SS, in this language, the sort value is higher than the normal S.

Multi-level comparison provides four comparison levels: basic characters, accents, cases, and punctuation marks.

Note that collator does not support punctuation.

Let's take a look at some specific code for multi-level comparison examples:

 
System. Out. println ("A equals B->" + (collator. Compare ("A", "B") = 0? "True": "false"); system. out. println ("A equals à->" + (collator. compare ("A", "à") = 0? "True": "false"); system. out. println ("A equals a->" + (collator. compare ("A", "A") = 0? "True": "false "));

 

When collator. setstrength (collator. Primary ):

A equals B-> false
A equals à-> true
A equals a-> true

When collator. setstrength (collator. Secondary ):

A equals B-> false
A equals à-> false
A equals a-> true

When collator. setstrength (collator. Tertiary ):

A equals B-> false
A equals à-> false
A equals a-> false

There is also the following code, although the first line outputs false, but they do look exactly the same string:

Collator. setdecomposition (collator. canonical_decomposition); string single = "abgaskr \ signature"; string combined = "abgaskr \ u0075 \ signature"; system. Out. println ("single equals combined? "+ (Collator. Compare (single, combined) = 0? "True": "false "));

The seed collator class is hard to understand, but you can't do without it when you need to process different languages.

You can view
The javadoc document of the collator class.

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.