code: public void putAlias(String alias) throws JSONException {
          if (alias != null) {
              this.alias = alias;
              this.put(Defines.LinkParam.Alias.getKey(), alias);
          }
      }
docs: <b>Adds an alias to the link.</b>
  
  @param alias A {@link String} value containing the desired alias name to add.
  @throws JSONException The parameter value must be in valid JSON format, or a
  {@link JSONException} will be thrown.