Multilevel Inheritance

Multilevel inheritance is the form of inheritance in which there is a base class and the derived class. The derived class is itself the base class .Derived class itself acts as the base class of some other derived class.

Following is the code of a multilevel inheritance.The code below has four classes Fclass ,Sclass, Tclass,Mlevel. Fclass is the base class for Sclass, Sclass is the derived lass for Fclass and acts as the base class for Tclass, Tclass is the derived class of Sclass.
Mlevel class creates object of the Tclass and using objects functions f1,f2 and f3 are called.

Program for Multilevel Inheritance

class Fclass
{
void f1()
{
System.out.println("First Class");
}
}

class Sclass extends Fclass
{
void f2()
{
System.out.println("Second Class");
}
}

class Tclass extends Sclass
{
void f3()
{
System.out.println("Class three");
}
}

class Mlevel
{
public static void main(String arg[])
{
Tclass obj=new Tclass();
obj.f1();
obj.f2();
obj.f3();
}
}

Following is the output of the above code for better understanding:

Single level Inhertance

In single level inheritance there is one base class and one child class that inherits the  features of the base class. The child class inherits the child class using the keyword"extends".
Syntax for single level inheritance is:
   class Child_class_name extends Base_class_name

Program for Single Level Inheritance

class My        //Base class
{
void input()
{
System.out.println("Class My");
}
}

class You extends My                       // class You inherits My class
{
void output()
{
System.out.print("Class You");
}
}

class Slevel
{
public static void main(String arg[])
{
You obj=new You();
obj.input();
obj.output();
}
}