java判斷是否為漢字

public static boolean isChinese(String str) {
		String regEx = "[\u4e00-\u9fa5]";
		Pattern pat = Pattern.compile(regEx);
		Matcher matcher = pat.matcher(str);
		boolean flg = false;
		if (matcher.find())
			flg = true;

		return flg;
	}