code: public CreateServiceRequest withPlacementConstraints(PlacementConstraint... placementConstraints) {
          if (this.placementConstraints == null) {
              setPlacementConstraints(new com.amazonaws.internal.SdkInternalList<PlacementConstraint>(placementConstraints.length));
          }
          for (PlacementConstraint ele : placementConstraints) {
              this.placementConstraints.add(ele);
          }
          return this;
      }
docs: <p>
  An array of placement constraint objects to use for tasks in your service. You can specify a maximum of 10
  constraints per task (this limit includes constraints in the task definition and those specified at runtime).
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setPlacementConstraints(java.util.Collection)} or {@link #withPlacementConstraints(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param placementConstraints
  An array of placement constraint objects to use for tasks in your service. You can specify a maximum of 10
  constraints per task (this limit includes constraints in the task definition and those specified at
  runtime).
  @return Returns a reference to this object so that method calls can be chained together.