code: public void setGoalType(com.google.api.ads.admanager.axis.v201808.GoalType goalType) {
          this.goalType = goalType;
      }
docs: Sets the goalType value for this Goal.
  
  @param goalType   * The type of the goal for the {@code LineItem}. It defines the
  period over which the goal
  for {@code LineItem} should be reached.