Java is a Object language, it does not feature all OOP concept but mosts. They are described briefly :

• -

class Dog  {
 String name;

 public Dog() {
    name=new String("unknown");
 }
}

is equivalent to

class Dog  {
 String name = "unknown";
}

compiler generate a Default contructor (same as 1st Dog class)

---

Let's introduce Inheritance

class Animal
{
 public void sleep() { System.out.println("sleeping");}
}

class Bird extends Animal
{
 public void fly() { System.out.println("flying");}
}

public static main(String args)
{
 Bird titi = new Bird();
 titi.sleep(); // sleeping
 titi.fly(); // flying
}

---

hineritance is like factorizing ( common code is placed in a mother class , then it is not duplicated)

class Dog extends Animal
{
 public void bark() { System.out.println("barking");}
}

public static main(String args)
{
 Bird titi = new Bird();
 titi.sleep(); // sleeping
 titi.fly(); // flying

 Dog droopy = new Dog();
 droopy.sleep(); // sleeping
 droopy.bark(); // barking

}

—- function overloading

class Animal
{
 public void sleep() { System.out.println("sleeping");}
}

class Bird extends Animal
{
 public void fly() { System.out.println("fly over the airs");}

 public void reproduce() { System.out.println("eggs"); }
}

class Pinguin extends Bird {
 public void fly() { System.out.println("stay on ground & move wings");
}

main() {
 Animal tux = new Pinguin();
 tux.fly(); // "stay on ground & move wings" // Pingouin.fly() called // ***
 tux.reproduce(); // "eggs" // Bird.reproduce() called
 tux.sleep(); // "Sleeping" // Animal.sleep() called
}

read it as A pinguin is a Bird that dont fly like a bird

---

Introduce super keyword

class Human extends Animal {

 public void dress() { System.out.println("i am dressed"); }

 public void undress() { System.out.println("i am naked"); }

 public void sleep() {
   undress();  // i am naked
   super.sleep();  // sleeping
 }
}

OOP Basics explained , see Java

Model View Controller aka MVC : http://www.ootips.org/mvc-pattern.html

Book : modern cpp design, andrei alexandrescu

http://www.dofactory.com/Patterns/Patterns.aspx

Livre http://www.amazon.fr/exec/obidos/ASIN/2841773507/rzr-21#