Designpattern

Have you ever used an access card to go through a door?

Did you ever have fresh tea from some stall?

How do you turn on the computer?

Imagine you run a car service shop offering multiple services.

Every organization is composed of employees.

the user to change the theme.

transfer them to your computer.

words how the entities can use each other.

There can only be one president of a country at a time.