code: public void setPolicyNames(java.util.Collection<String> policyNames) {
          if (policyNames == null) {
              this.policyNames = null;
              return;
          }
  
          this.policyNames = new com.amazonaws.internal.SdkInternalList<String>(policyNames);
      }
docs: <p>
  The names of one or more policies. If you omit this parameter, all policies are described. If a group name is
  provided, the results are limited to that group. This list is limited to 50 items. If you specify an unknown
  policy name, it is ignored with no error.
  </p>
  
  @param policyNames
  The names of one or more policies. If you omit this parameter, all policies are described. If a group name
  is provided, the results are limited to that group. This list is limited to 50 items. If you specify an
  unknown policy name, it is ignored with no error.