Code:-
import java.util.*;
class Base
{
    public void ff()
    {
       System.out.println("This is a base class");
    }
}
class  Derive1 extends Base
{
     public void mm()
     {
        System.out.println("This is derive class1");
      } 
}
class  Derive2 extends Derive1
{
     public void mn()
     {
        System.out.println("This is derive class2");
      } 
}
class multilevel
{
   public static void main(String[] args)
   {
        Derive2 obj=new Derive2();
        obj.ff();
        obj.mm();
        obj.mn();
   }
}
Output:-
This is a base class
This is derive class1
This is derive class2
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