Write a java program for multilevel inheritance

The inherited methods can be used directly as they are.

hierarchical inheritance in java

Although with interfaces, multiple inheritance is supported by java. This article is contributed by Gaurav Miglani. Here, the method of Person is overridden in Emp and the same method is overridden again in Manager.

multilevel inheritance in java for employee details

We can see the corresponding outputs here. Superclass can only be one: A superclass can have any number of subclasses. Inheriting Constructors: A subclass inherits all the members fields, methods, and nested classes from its superclass.

Student details using multilevel inheritance in java

But a subclass can have only one superclass. London In the above example, as discussed above, the constructor of grandparent class Person is executed first, then parent class Emp and then that of child class Manager. And we have also learned about super keyword to call the constructor of the parent class from the child class. Here, the method of Person is overridden in Emp and the same method is overridden again in Manager. Then the method nationality of Person and the method organization of Emp are accessed through Manager object as if they are own methods of Manager. From inside the constructor of the Child class we are calling the constructor of the Parent class by using the super keyword. Although with interfaces, multiple inheritance is supported by java. We can write a new static method in the subclass that has the same signature as the one in the superclass, thus hiding it. In sub-classes we can inherit members as is, replace them, hide them, or supplement them with new members: The inherited fields can be used directly, just like any other fields. Explanation So, in the above code we can see that the Child class is inheriting the Parent class which is inheriting the GrandParent class. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. If we look at the above output we can see that first the constructor of the GrandParent class is called. The inherited methods can be used directly as they are.

From inside the constructor of the Child class we are calling the constructor of the Parent class by using the super keyword. London In the above example, as discussed above, the constructor of grandparent class Person is executed first, then parent class Emp and then that of child class Manager.

Student inheritance program in java

At last, we have invoked the method place which exists in all the three classes. From inside the constructor of the Child class we are calling the constructor of the Parent class by using the super keyword. In the above example, all the methods are normal default. If we make a feature as public, then there is no restriction, such elements can be accessed from anywhere. Inheriting Constructors: A subclass inherits all the members fields, methods, and nested classes from its superclass. From inside the constructor of the Parent class. We can write a new static method in the subclass that has the same signature as the one in the superclass, thus hiding it. Example In the following example we have class GrandParent which is inherited by the class Parent which gets inherited by class Child.

So the version in Manager got executed.

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How to Implement Multilevel Inheritance in Java