code: public Cluster withIamRoles(ClusterIamRole... iamRoles) {
          if (this.iamRoles == null) {
              setIamRoles(new com.amazonaws.internal.SdkInternalList<ClusterIamRole>(iamRoles.length));
          }
          for (ClusterIamRole ele : iamRoles) {
              this.iamRoles.add(ele);
          }
          return this;
      }
docs: <p>
  A list of AWS Identity and Access Management (IAM) roles that can be used by the cluster to access other AWS
  services.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIamRoles(java.util.Collection)} or {@link #withIamRoles(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param iamRoles
  A list of AWS Identity and Access Management (IAM) roles that can be used by the cluster to access other
  AWS services.
  @return Returns a reference to this object so that method calls can be chained together.