Exercices corrigés Java les classes et l’héritage – Partie 2

//La classe Person
class Person
{
    protected int age;
	
    public void sayHello()
    {
		System.out.println("Hello");
    }
	
    public void setAge(int n)
    {
        age = n;
    }
}

//La classe Student
class Student extends Person
{
    public void goToClasses()
    {
		System.out.println("I’m going to class.");
    }
    public void displayAge()
    {
		System.out.println("My age is: "+ age +" years old");
    }
}

//La classe Teacher
class Teacher extends Person
{
    private String subject;
	
    public void explain()
    {
		System.out.println("Explanation begins");
    }
}

//Classe de test
public class Main
{
	public static void main(String[] args) 
	{
           Person p = new Person();
           p.sayHello();
		
           Student s = new Student();
           s.goToClasses();
           s.setAge(15);
           s.sayHello();
           s.displayAge();
		
           Teacher t = new Teacher();
           t.setAge(40);
           t.sayHello();
           t.explain();
	}
}

class House 
{
	protected int surface;
	protected Door door;
	  
	public House(int surface) 
	{
		this.surface = surface;
		door = new Door();
	}
	  
	public int getSurface()
	{
		return surface;
	}
	  
	public void setSurface(int value)
	{
		surface = value;
	}
	  
	public Door getDoor()
	{
		return door; 
	}
	  
	public void setDoor(Door d)
	{
		door = d;
	}
	  
	public void display() 
	{
		System.out.println("Je suis une maison, ma surface est de "+ surface +" m2.");
	}
}

class Door
{
	protected String color;
	  
	public Door() 
	{
		color = "blue";
	}
	  
	public Door(String color) 
	{
		this.color = color;
	}
	  
	public String getColor()
	{
		return color;
	}
	  
	public void setColor(String value)
	{
		color = value;
	}
	  
	public void display() 
	{
		System.out.println("Je suis une porte, ma couleur est "+ color +".");
	}
}

class Apartment extends House 
{
	public Apartment()
	{
		super(50);
	}
	  
	public void display()
	{
		System.out.println("Je suis un appartement, ma surface est " + surface + " m2");
	}
}

class Person 
{
  protected String name;
  protected House house;
  
  public Person() 
  {
    name = "Thomas";
    house = new House(150);
  }
  
  public Person(String name, House house)
  {
	  this.name = name;
	  this.house = house;
  }
  
  public String getName()
  {
	  return name;
  }
  
  public void setName(String value) 
  {
	  name = value;
  }
  
  public House getHouse()
  {
	  return house; 
  }
  
  public void setHouse(House h)
  {
	  house = h; 
  }
  
  public void display() 
  {
	  System.out.println("Je m'appele "+ name +".");
	  house.display();
	  house.door.display();
  }
}

//Classe de test
public class Main
{
	public static void main(String[] args) 
	{
       Apartment MyApartament = new Apartment();
       Person person = new Person();
       person.name = "Thomas";
       person.house = MyApartament;
       person.display();
	}
}