code: public InstanceFleetConfig withInstanceTypeConfigs(InstanceTypeConfig... instanceTypeConfigs) {
          if (this.instanceTypeConfigs == null) {
              setInstanceTypeConfigs(new com.amazonaws.internal.SdkInternalList<InstanceTypeConfig>(instanceTypeConfigs.length));
          }
          for (InstanceTypeConfig ele : instanceTypeConfigs) {
              this.instanceTypeConfigs.add(ele);
          }
          return this;
      }
docs: <p>
  The instance type configurations that define the EC2 instances in the instance fleet.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setInstanceTypeConfigs(java.util.Collection)} or {@link #withInstanceTypeConfigs(java.util.Collection)}
  if you want to override the existing values.
  </p>
  
  @param instanceTypeConfigs
  The instance type configurations that define the EC2 instances in the instance fleet.
  @return Returns a reference to this object so that method calls can be chained together.