java pad with character

1. padStart

  public static String padStart(String string, int minLength, char padChar) {
    checkNotNull(string);  // eager for GWT.
    if (string.length() >= minLength) {
      return string;
    }
    StringBuilder sb = new StringBuilder(minLength);
    for (int i = string.length(); i < minLength; i++) {
      sb.append(padChar);
    }
    sb.append(string);
    return sb.toString();
  }

2. 아 귀찮다 http://www.leveluplunch.com/java/examples/left-pad-string/

3, 뭔가 정리하고 싶은데 귀찮네

        String seqNumber = Strings.padStart(Integer.toString(seq), SEQ_LENGTH, '0');
        //seqNumber = String.format("%10d", seq).replace(" ", "0");
        //seqNumber = StringUtils.leftPad(Integer.toString(seq), SEQ_LENGTH, '0');

4. leftPad

    public static String leftPad(final String str, final int size, final char padChar) {
        if (str == null) {
            return null;
        }
        final int pads = size - str.length();
        if (pads <= 0) {
            return str; // returns original String when possible
        }
        if (pads > PAD_LIMIT) {
            return leftPad(str, size, String.valueOf(padChar));
        }
        return repeat(padChar, pads).concat(str);
    }

    public static String repeat(final char ch, final int repeat) {
        final char[] buf = new char[repeat];
        for (int i = repeat - 1; i >= 0; i--) {
            buf[i] = ch;
        }
        return new String(buf);
    }