The multi-level inheritance includes the involvement of at least two or more than two classes. One class inherits the features from a parent class and the newly created sub-class becomes the base class for another new class.
When a class extends a class, which extends anther class then this is called multilevel inheritance. For example class C extends class B and class B extends class A then this type of inheritance is known as multilevel inheritance.
It’s pretty clear with the diagram that in Multilevel inheritance there is a concept of grand parent class. If we take the example of this diagram, then class C inherits class B and class B inherits class A which means B is a parent class of C and A is a parent class of B. So in this case class C is implicitly inheriting the properties and methods of class A along with class B that’s what is called multilevel inheritance.
Example.
class Shape {
void display() {
System.out.println("Inside display");
}
}
class Rectangle extends Shape {
void area() {
System.out.println("Inside area");
}
}
class Cube extends Rectangle {
void volume() {
System.out.println("Inside volume");
}
}
public static void main(String[] arguments) {
Cube cube = new Cube();
cube.display();
cube.area();
cube.volume();
}
}
Reference.
https://www.tutorialspoint.com/Multilevel-inheritance-in-Java
https://beginnersbook.com/2013/12/multilevel-inheritance-in-java-with-example/
https://www.codingninjas.com/codestudio/library/multilevel-inheritance-in-java
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