code: public DescribeCacheEngineVersionsResult withCacheEngineVersions(CacheEngineVersion... cacheEngineVersions) {
          if (this.cacheEngineVersions == null) {
              setCacheEngineVersions(new com.amazonaws.internal.SdkInternalList<CacheEngineVersion>(cacheEngineVersions.length));
          }
          for (CacheEngineVersion ele : cacheEngineVersions) {
              this.cacheEngineVersions.add(ele);
          }
          return this;
      }
docs: <p>
  A list of cache engine version details. Each element in the list contains detailed information about one cache
  engine version.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setCacheEngineVersions(java.util.Collection)} or {@link #withCacheEngineVersions(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param cacheEngineVersions
  A list of cache engine version details. Each element in the list contains detailed information about one
  cache engine version.
  @return Returns a reference to this object so that method calls can be chained together.