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StringUtils isEmpty和isBlank區別

 StringUtils原始碼如下:

  public static boolean isEmpty(final CharSequence cs) {
        return cs == null || cs.length() == 0;
    }
    public static boolean isBlank(final CharSequence cs) {
        int strLen;
        if (cs == null || (strLen = cs.length()) == 0) {
            return true;
        }
        for (int i = 0; i < strLen; i++) {
            if (!Character.isWhitespace(cs.charAt(i))) {
                return false;
            }
        }
        return true;
    }

測試結果