java判断字符串是正整数的实例

public static boolean isPureDigital(String string) {
    if (isBlank(string))
      return false;
    String regEx1 = "\\d+";
    Pattern p;
    Matcher m;
    p = Pattern.compile(regEx1);
    m = p.matcher(string);
    if (m.matches())
      return true;
    else
      return false;
  }