Design Patterns

https://refactoring.guru/design-patterns/
https://www.coursera.org/learn/design-patterns/home/welcome

Template Method pattern: 
  - is a behavioral design pattern 
  - that defines the skeleton of an algorithm in the superclass 
  - but lets subclasses override specific steps of the algorithm in the subclasses without changing its structure.

``java``
    public abstract class SelfDrivingVehicle {
    
        //Templete method
        public final void driveToDestination() {
            reachToDestination();
            steer();
            accelerate();
            barke();
        }

        protected abstract void steer();
        protected abstract void accelerate();
        protected abstract void barke();

        private void reachToDestination() {
            System.out.println("Reach to destination");
        }
    }
```   

Chain of Responsibility 
  - is a behavioral design pattern 
  - that lets you pass requests along a chain of handlers. 
  - Upon receiving a request, each handler decides either to process the request or to pass it to the next handler in the chain.
  
  Example: https://www.tutorialspoint.com/design_pattern/chain_of_responsibility_pattern.htm