code: public ReservedInstancesListing withInstanceCounts(InstanceCount... instanceCounts) {
          if (this.instanceCounts == null) {
              setInstanceCounts(new com.amazonaws.internal.SdkInternalList<InstanceCount>(instanceCounts.length));
          }
          for (InstanceCount ele : instanceCounts) {
              this.instanceCounts.add(ele);
          }
          return this;
      }
docs: <p>
  The number of instances in this state.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setInstanceCounts(java.util.Collection)} or {@link #withInstanceCounts(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param instanceCounts
  The number of instances in this state.
  @return Returns a reference to this object so that method calls can be chained together.