What is the java domain?

Domain in java

The so-called domain is actually the translation of "field", which is what we often call fields, or Attributes. Such as class fields (properties), local and global.

field, a field is an attribute, which can be a class variable, an object variable, an object method variable or a function parameter.

class bike{ 
  static int bikes;
  int gear;
  int cadence;

  void create( int newGear, int newCadence ){
    bikes = bikes + 1;
    gear = newGear;
    cadence = newCadence;}
  int getSpeed(){
    int speed = gear*cadence*5*3.141;
    return speed;
  }
}

bikes is a class variable (static domain).

gear and cadence are object variables (instance variables) (non-static fields).

(There is a little contradiction here. In fact, according to the encyclopedia, bikes, gear and cadence are all class variables. bikes is a static variable in the class variable, and gear and cadence are class variables. Instance variable.)

speed is a variable (local variable) of the object method.

(See, local variable, gobal variable, global variable does not appear in Java. If I want to say, the scope of class variables is the same as global variables, but they are not called that).

newGear and newCadence are parameters (parameters) of functions (methods).

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