判断是不是合法手机

/**
  * 判断是不是合法手机
  * handset 手机号码
  */
public static boolean isHandset(String handset) {
  try {
   if(!handset.substring(0,1).equals("1")) {
    return false;
   }
   if (handset==null || handset.length()!=11) {
    return false;
   }
   String check = "^[0123456789]+$";
   Pattern regex = Pattern.compile(check);
   Matcher matcher = regex.matcher(handset);
   boolean isMatched = matcher.matches();
   if(isMatched) {
    return true;
   } else {
    return false;
   }
  } catch (RuntimeException e) {
   return false;
  }
}