can abstraction be used in multilevel inheritance code example

Example 1: how u can achieve multiple inheritances

Multiple inheritance in Java programming is achieved or 
implemented using interfaces. Java does not support multiple 
inheritance using classes.
In simple term, a class can inherit only one class and multiple 
interfaces in a java programs. In java terminology, we can say that

“A class can extend only one class but it can implement 
multiple interfaces.”

Example 2: java program to demonstrate multilevel inheritance

Class X
{
   public void methodX()
   {
     System.out.println("Class X method");
   }
}
Class Y extends X
{
public void methodY()
{
System.out.println("class Y method");
}
}
Class Z extends Y
{
   public void methodZ()
   {
     System.out.println("class Z method");
   }
   public static void main(String args[])
   {
     Z obj = new Z();
     obj.methodX(); //calling grand parent class method
     obj.methodY(); //calling parent class method
     obj.methodZ(); //calling local method
  }
}