Dans le TD précédent ...

Apprenons à programmer

avec

public class MaClasse {

.... ....

}

fichiers .java

javac

compilation

0100 1010101010

fichiers .class (bytecode)

jvm

public class Pokemon {

  private String name;

  private int level;

  private String type;

  public Pokemon(String name, int level, String type) {
     this.name = name;
     this.level = level;
     this.type = type;
  }

  ...

}

Pokemon pikachu = new Pokemon("Pikachu", 20, "Électrique");

Constructeur

Nouvelles instances !!!!

Pokemon pikachu = new Pokemon("Pikachu", 20, "Électrique");

Objets créés

@

pikachu

Pokemon pikachu2 = pikachu;

@

pikachu2

pikachu2.faireEvoluer();

Notion de référence

Test d'égalité

public class SuperHero{

    private String name;

    public SuperHero(String name){
        this.name = name;
    }
}



....

SuperHero batman = new SuperHero("batman");
SuperHero batmanAgain = new SuperHero("batman");

( batman == batmanAgain ) ==> false

Test d'égalité

public class SuperHero{

    private String name;

    public SuperHero(String name){
        this.name = name;
    }

    public boolean equals(Object obj){
        return (obj instanceof SuperHero) 
            && (this.name.equals(((SuperHero) obj).name));
    }
}



....

SuperHero batman = new SuperHero("batman");
SuperHero batmanAgain = new SuperHero("batman");

(batman.equals(batmanAgain)) ==> true

type primitif = VALEUR

int monAge = 28;

int monAgeAgain = 28;


(monAge == monAgeAgain) => true

ÉCRIRE UN PROGRAMME JAVA

• JDK
• Third party Librairies
• Own Classes

0..*

public class Dresseur {

   private String name;
   
   private Pokemon[] pokemons;

   public Dresseur(String name, Pokemon[] pokemons){
        this.name = name;
        this.pokemons = pokemons;
   }

}

AGGRÉGATION

Pokemon pikachu = new Pokemon("Pikachu", 20, "Électrique");


Pokemon[] pokemonsSacha = new Pokemon[1];
pokemonsSacha[0] = pikachu;

Pokemon[] pokemonsOndine = new Pokemon[1];
pokemonsOndine[0] = pikachu;

Dresseur sacha = new Dresseur("Sacha", pokemonsSacha);

Dresseur ondine = new Dresseur("Ondine", pokemonsOndine);

AGGRÉGATION

class Pokemon{

    public Pokemon(Pokemon exemple){
        
        this.name = exemple.name;
        this.level = level;
        this.type = type;
    
    }

}

...

Pokemon pikachu = new Pokemon("Pikachu", 20, "Électrique");

Pokemon[] pokemonsSacha = new Pokemon[1];
pokemonsSacha[0] = new Pokemon(pikachu);

Pokemon[] pokemonsOndine = new Pokemon[1];
pokemonsOndine[0] = new Pokemon(pikachu);

Dresseur sacha = new Dresseur("Sacha", pokemonsSacha);

Dresseur ondine = new Dresseur("Ondine", pokemonsOndine);

constructeur par recopie

Et maintenant ...

L'Héritage