code: public DescribeClustersResult withClusters(Cluster... clusters) {
          if (this.clusters == null) {
              setClusters(new com.amazonaws.internal.SdkInternalList<Cluster>(clusters.length));
          }
          for (Cluster ele : clusters) {
              this.clusters.add(ele);
          }
          return this;
      }
docs: <p>
  A list of <code>Cluster</code> objects, where each object describes one cluster.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setClusters(java.util.Collection)} or {@link #withClusters(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param clusters
  A list of <code>Cluster</code> objects, where each object describes one cluster.
  @return Returns a reference to this object so that method calls can be chained together.