public boolean containsHangul(String str)
{
    for(int i = 0 ; i < str.length() ; i++)
    {
        char ch = str.charAt(i);
        Character.UnicodeBlock unicodeBlock = Character.UnicodeBlock.of(ch);
        if(UnicodeBlock.HANGUL_SYLLABLES.equals(unicodeBlock) ||
                UnicodeBlock.HANGUL_COMPATIBILITY_JAMO.equals(unicodeBlock) ||
                UnicodeBlock.HANGUL_JAMO.equals(unicodeBlock))
            return true;
    }
    return false;
}