Elegant Object
Book by Yegor Bugayenko
What is Object Oriented Programming?
- Opposition with procedural proramming
- Use objects :
Data : attributes or properties
Code : procedures called methods
Birth of the objects
The Name
- Name it for what it is and not for what it does
Example : Cash VS CashConverter
The Constructor
- One primary constructor and some secondary constructors
public class Cash{
private int dollars;
Cash(int dlr){
this.dollars=dlr;
}
Cash(String dlr){
this(Cash.parse(dlr);
}
Cash(float dlr){
this((int)dlr);
}
}Education
The Encapsulation
- Encapsulate a maximum of 4 objects --> stay clear
The Methods
- Do not use static methods
- Use interfaces for public methods --> decouple the objects (modify the object without changing the objects it interact with)
public class Client{
private String name;
private String address;
private String birthdate;
}public class Address{
private int number;
private String Street;
private String City
private int PostalCode;
}Education
The Methods
- Builders names are Nouns --> always return someting, but never void
- Manipulator's names are Verbs --> always return void
class Pixel{ // Manipulator
void Paint(Color color);
}
Pixel center = new Pixel(50,50);
center.paint(new Color("red"));- The boolean should have adjectives for names.
class Human{
private String Name;
private int Age;
public Human(String Name, int Age){
this.Name=Name;
this.Age=Age;
}
public String getName(){
return Name;
}
}Constant
- You should not use global constant (public static final), this is against the definition of Oriented Object Programming
Immuability
- The objects must be immutable in order to avoid bugs and thread safe
- This is better to use small classes