Check Unicode Kanji Halfwidth and Fullwidth (Japanese)

Check Unicode Kanji

Demo

Check length chữ Kanji Fullsize Halfsize (Japanese)

Java

import java.io.UnsupportedEncodingException;

/**
 *
 * @author lonelyCat
 */
public class demo {

    public static void main(String[] args) {
        String fullKana = "ナ";
        String halfKana = "ﾅ";
        String kanji = "使";
        try {
            System.out.println("=====fullKana==Shift_JIS===" + fullKana.getBytes("Shift_JIS").length);
            System.out.println("=====halfKana==Shift_JIS===" + halfKana.getBytes("Shift_JIS").length);
            System.out.println("=====kanji==Shift_JIS===" + kanji.getBytes("Shift_JIS").length);

            System.out.println("=====fullKana==UTF8===" + fullKana.getBytes("UTF8").length);
            System.out.println("=====halfKana==UTF8===" + halfKana.getBytes("UTF8").length);
            System.out.println("=====kanji==UTF8===" + kanji.getBytes("UTF8").length);

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }
}

run:
=====fullKana==Shift_JIS===2
=====halfKana==Shift_JIS===1
=====kanji==Shift_JIS===2
=====fullKana==UTF8===3
=====halfKana==UTF8===3
=====kanji==UTF8===3
BUILD SUCCESSFUL (total time: 0 seconds)

// REFERENCE UNICODE TABLES: 
// kanji_codes.unicode.shtml
// unicode.html
//
// TEST EDITOR:
// tools/regex
//
// UNICODE RANGE : DESCRIPTION
//
// [\u3000-\u303F] : punctuation
// [\u3040-\u309F] : hiragana
// [\u30A0-\u30FF] : katakana
// [\uFF00-\uFFEF] : Full-width roman characters and half-width katakana
// [\u4E00-\u9FAF] : CJK unifed ideographs - Common and uncommon kanji
// 
// Non-Japanese punctuation/formatting characters commonly used in Japanese text
// 2605-2606 : Stars
// 2190-2195 : Arrows
// u203B     : Weird asterisk thing

Japanese style punctuation: [\u3000-\u303f]
Hiragana: [\u3040-\u309f]
Katakana: [\u30a0-\u30ff]
Roman characters + half-width katakana: [\uff00-\uffef]
Kanji: [\u4e00-\u9faf]|[\u3400-\u4dbf]