code: public UntagResourceRequest withTagKeys(String... tagKeys) {
          if (this.tagKeys == null) {
              setTagKeys(new com.ibm.cloud.objectstorage.internal.SdkInternalList<String>(tagKeys.length));
          }
          for (String ele : tagKeys) {
              this.tagKeys.add(ele);
          }
          return this;
      }
docs: <p>
  One or more tag keys. Specify only the tag keys, not the tag values.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setTagKeys(java.util.Collection)} or {@link #withTagKeys(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param tagKeys
  One or more tag keys. Specify only the tag keys, not the tag values.
  @return Returns a reference to this object so that method calls can be chained together.