Classification and Inheritance

Core java OOPs Tutorial

Core Java Interview Materials

Basically java support four type of inheritance:-
1.Single inheritance
2.Multilevel inheritance
3.Hierarchical inheritance
4.Hybrid inheritance

Single inheritance:-When a  subclass is derived simply from it's parent class then this mechanism is known as simple inheritance. In case of simple inheritance there is only a sub class and it's parent class.

Multilevel inheritance:-It is the enhancement of the concept of inheritance. When a subclass is derived from a derived class then this mechanism is known as the multilevel inheritance. 

Hierarchical inheritance:- when child class inherit the feature of parent class then it is called the hierarchical inheritance

Hybrid inheritance:- Hybrid inheritance inherit the features of two classes like a hybrid contain the feature of two .similarly hybrid inheritance inherit the features of two classes.

 Single inheritance
class A
	{
  int x;
  int y;
  int get(int p, int q)
	  {
    x=p; y=q; return(0);
    }
    void Show()
		{
      System.out.println(x);
      }
}

Multilevel inheritance


class A 
	{
  int x;
  int y;
  int get(int p, int q)
	  {
    x=p; y=q; return(0);
    }
    void Show()
		{
      System.out.println(x);
      }
}
class B extends A
	{
  void Show()
	  {
    System.out.println("B");
    }
}

class C extends B
	{
  void display()
	  {
    System.out.println("C");
  }
  public static void main(String args[]){
    A a = new A();
    a.get(6,9);
    a.Show();
    }
}




class B extends A
	{
  public static void main(String args[]){
    A a = new A();
    a.get(6,9);
    a.Show();
    }
    void display()
		{
      System.out.println("B");
      }
}