code: public void setGrantTokens(java.util.Collection<String> grantTokens) {
          if (grantTokens == null) {
              this.grantTokens = null;
              return;
          }
  
          this.grantTokens = new com.amazonaws.internal.SdkInternalList<String>(grantTokens);
      }
docs: <p>
  A list of grant tokens.
  </p>
  <p>
  For more information, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#grant_token">Grant Tokens</a> in the
  <i>AWS Key Management Service Developer Guide</i>.
  </p>
  
  @param grantTokens
  A list of grant tokens.</p>
  <p>
  For more information, see <a
  href="http://docs.aws.amazon.com/kms/latest/developerguide/concepts.html#grant_token">Grant Tokens</a> in
  the <i>AWS Key Management Service Developer Guide</i>.