code: public DescribeResourceGroupsResult withResourceGroups(ResourceGroup... resourceGroups) {
          if (this.resourceGroups == null) {
              setResourceGroups(new java.util.ArrayList<ResourceGroup>(resourceGroups.length));
          }
          for (ResourceGroup ele : resourceGroups) {
              this.resourceGroups.add(ele);
          }
          return this;
      }
docs: <p>
  Information about a resource group.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setResourceGroups(java.util.Collection)} or {@link #withResourceGroups(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param resourceGroups
  Information about a resource group.
  @return Returns a reference to this object so that method calls can be chained together.