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Demonstrate constructors in a Multilevel Hierarchy in Java
Multilevel inheritance is when a class inherits a class which inherits another class. An example of this is class C inherits class B and class B in turn inherits class A.
A program that demonstrates constructors in a Multilevel Hierarchy in Java is given as follows:
Example
class A { A() { System.out.println("This is constructor of class A"); } } class B extends A { B() { System.out.println("This is constructor of class B"); } } class C extends B { C() { System.out.println("This is constructor of class C"); } } public class Demo { public static void main(String args[]) { C obj = new C(); } }
Output
This is constructor of class A This is constructor of class B This is constructor of class C
Now let us understand the above program.
The class A contains the constructor A(). The class B uses the extends keyword to inherit class A. It also contains the constructor B(). The class C uses the extends keyword to inherit class B. It contains the constructor C(). A code snippet which demonstrates this is as follows:
class A { A() { System.out.println("This is constructor of class A"); } } class B extends A { B() { System.out.println("This is constructor of class B"); } } class C extends B { C() { System.out.println("This is constructor of class C"); } }
In the main() method in class Demo, an object obj of class C is created. A code snippet which demonstrates this is as follows:
public class Demo { public static void main(String args[]) { C obj = new C(); } }
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