OOP:

What is the object?

Because we use programming to make our real world easier.. Every real object can be represented by a programming object that has a state and behavior

>>Through the class we form a primitive structure of the object.

public class Bicycle {
    
// the Bicycle class has
// three fields
public int cadence;
public int gear;
public int speed;
    
// the Bicycle class has
// one constructor
public Bicycle(int startCadence, int startSpeed, int startGear) {
    gear = startGear;
    cadence = startCadence;
    speed = startSpeed;
}

If we have a set of objects that are combined with characteristics and behaviors.

—> Its organization can be facilitated by inheritance, building a base object and deriving others from it

>> Class group can be organized using the package

What is the interface?

The interface is a contract between the code and the outside world .. where the results of operations are shown in an understandable way for any user

Numbers system:

Decimals:

a decimal number has a “position” ,it also called “Base 10”:

0, 1, 2, 3, 4, 5, 6, 7, 8 and 9

Binary Numbers:

“Base 2” numbers instead of “Base 10” , so its has just 0 and1 numbers.

Hexadecimal Numbers:

“Base 16”, they look the same as the decimal numbers up to 9, but then there are the letters ("A',"B","C","D","E","F") in place of the decimal numbers 10 to 15.

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