最好采用哪种设计模式来控制一系列步骤？

public class Order {
    private State state;

    public void setState(State state) {
        this.state = state;
    }

    public void process() {
        if (state == State.UNPROCESSED) {
            // 处理订单
            state = State.PROCESSED;
        } else if (state == State.PROCESSED) {
            // 发货
            state = State.SHIPPED;
        } else if (state == State.SHIPPED) {
            // 完成订单
            state = State.COMPLETED;
        }
    }
}

public enum State {
    UNPROCESSED, PROCESSED, SHIPPED, COMPLETED
}

public class OrderController {
    private List<IOrderStep> steps = new ArrayList<>();

    public void addStep(IOrderStep step) {
        steps.add(step);
    }

    public void execute(Order order) {
        for (IOrderStep step : steps) {
            step.execute(order);
        }
    }
}

public interface IOrderStep {
    void execute(Order order);
}

public class OrderStep1 implements IOrderStep {
    public void execute(Order order) {
        // 处理订单
    }
}

public class OrderStep2 implements IOrderStep {
    public void execute(Order order) {
        // 发货
    }
}

public class OrderStep3 implements IOrderStep {
    public void execute(Order order) {
        // 完成订单
    }
}