[Java] 이름 마스킹 코드

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이름을 asterisk(*)로 암호화하는 코드입니다.

	/**
	 * maskingName
	 *  
	 * @param str
	 * @return String
	 */
	public static String maskingName(String str) {
		String replaceString = str;

		String pattern = "";
		if(str.length() == 2) {
			pattern = "^(.)(.+)$";
		} else {
			pattern = "^(.)(.+)(.)$";
		}

		Matcher matcher = Pattern.compile(pattern).matcher(str);

		if(matcher.matches()) {
			replaceString = "";

			for(int i=1;i<=matcher.groupCount();i++) {
				String replaceTarget = matcher.group(i);
				if(i == 2) {
					char[] c = new char[replaceTarget.length()];
					Arrays.fill(c, '*');

					replaceString = replaceString + String.valueOf(c);
				} else {
					replaceString = replaceString + replaceTarget;
				}

			}
		}
		return replaceString;
	}