//---------------------------abstraction--------------------------------

//	when we translit the object from real world to our class
//	we chose only the fatures witch e need in our class
//	for example create a class "Rectangle", and  we need 4 variables for it description
//	they are coordinates of high left corner, width and height.

	class rect{
  		float x,y,w,h;
 		void draw(){}
	}

//	but such features as color and material are not important for my task

//---------------------------polymorphism-------------------------------

//	the interface methods can be implemented in many ways
//	for example we have the interface "activity" and a method "doingActivities"

	interface activity{
		string doingActivities();
	}

//	it implements to the objects "workers"
//	as each worker can do different activities, each of them implement the method
//	"doingActivities" in different ways

	class BuildWorker implements activity{
		@overrite
		string doingActivities(){
			return "can Build";
		}
	}

	class CookWorker implements activity{
		@overrite
		string doingActivities(){
			return "can Cook";
		}
	}

//---------------------------encapsulation-------------------------------

//	we need to hide some part of our code.

	class MyObject{
		private double mass;
		public double price;
	}

//	so that some variables and methods can not be changed;
//	for example we have object with mass as public parametr.

	class MyObject{
		public double mass;
		public double price;
	}

//	and someone has set it -12.
//	As the mass can not less then  0 the problems can appear


//---------------------------inheritance--------------------------------------

// 	this allows to use an existion code from another class
//	for example:

	class LampBulb {
  		float power;
    		void shine();
	}

	class LedLampBulb extends LampBulb{
		string [] someElectronics;
	}

	class FluorescentTubes extends  LampBulb{
    		string HighVoltageElectronics;
	}

//	extendsed classes LedLampBulb and FluorescentTubes also have variable "power"
//	and method "shine" from class LampBulb

//---------------------------Delegation-------------------------------

//	is when cthe class transmit some part of it work to other classes
//  	for instance the Boss has got some order and allocate it between workers