文字列のバイト数を返します | Codetter（こーどったー）

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public static int getLength(String str) {
    int ret = 0;
    byte[] bytes;
    try {
        // MS932エンコード
        bytes = str.getBytes("MS932");
        if (bytes != null)
            ret = bytes.length;
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return ret;
}
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