Polymorphism

Internet resources

@see Oracle Java Tutorial

@see Java Polymorphism

@see heritage and polymorphism (French)

@see Heritage en Java (French)

@see Abstract and Interface (French)

Implementation model

Polymorphism/Interface/Inheritance model
interface Humanable
    see
    eat
    walk
    run
    rest
    rip

interface Doctor
    heal

interface Warrior
    fight

Interface Warlock
    cast

Abstract Superman implements interface Human, Doctor, Warrior, Warlock
    Human
        see ="Everything"
        eat="Never"
        walk = return "run"
        run = return "flash run "
        rest = return "never"
        rip = return "never"
    Doctor
        heal = return "Surgeon"
    Warrior
        fight = return "Marine"
    Warlock
        cast = return "Fireball"

Class Somebody extends Superman
    Human h = new Human
        h.see="Blind"
        h.eat="allways"
        h.walk = "walk"
        h.run = "run"
        h.rest = "every night"
        h.rip = return "80 years"
    Doctor d = new Doctor
        d.heal="cannot heal"
    Warrior w1 = new Warrior
        w1.figth="cannot fight"
    Warlock w2 = New Warlock
        w2.cast="cannot cast"

Tips

Interfaces (abstract) are used for defining object behaviour. the behaviour can be understood and noted as ‘object’ followed by ‘able’ like ‘Serializable’, if you cannot say ‘object’able you should not create an interface, but an object. (abstract or POJO)

Super class are used for defining the « standard behavior » of objects

An object is defined by its class, once the object exists the object can be manipulated by any super.class without loosing its own properties. (a sub-class bears its own properties which add properties of the existing properties of its super class).