code: public InstanceFleet withInstanceTypeSpecifications(InstanceTypeSpecification... instanceTypeSpecifications) {
          if (this.instanceTypeSpecifications == null) {
              setInstanceTypeSpecifications(new com.amazonaws.internal.SdkInternalList<InstanceTypeSpecification>(instanceTypeSpecifications.length));
          }
          for (InstanceTypeSpecification ele : instanceTypeSpecifications) {
              this.instanceTypeSpecifications.add(ele);
          }
          return this;
      }
docs: <p>
  The specification for the instance types that comprise an instance fleet. Up to five unique instance
  specifications may be defined for each instance fleet.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setInstanceTypeSpecifications(java.util.Collection)} or
  {@link #withInstanceTypeSpecifications(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param instanceTypeSpecifications
  The specification for the instance types that comprise an instance fleet. Up to five unique instance
  specifications may be defined for each instance fleet.
  @return Returns a reference to this object so that method calls can be chained together.