Why superclass reference to subclass object

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Collectives on Stack Overflow. Learn more. Superclass reference to subclass object showing same behaviour as subclass reference to subclass object Ask Question. Asked 7 years, 4 months ago.

Active 4 years, 11 months ago. Viewed 32k times. Improve this question. You declare the type as superclass but in both instances the object you actually create is a sub. When you call the methods, since sub has those methods, they are called instead of the superclass. Put a method in superclass that you don't override in sub, then call it in those two examples to see the difference.

Add a comment. Active Oldest Votes. Static methods, on the other hand, are not virtual. You should call them via the class name: SuperClass. Improve this answer.

What happens when a subclass object is assigned to a superclass object in Java? Java 8 Object Oriented Programming Programming. Krishna Kasyap. Previous Page Print Page. Next Page. If in some subclass method you try to call the superclass constructor using the super keyword, the Java compiler will generate an error:. The super keyword is used to access a member of a superclass if the exact same name is used in the subclass. In the above example, the x member of class C is initialized with the x value of class B using a call:.

If two or more classes form a hierarchy of inheritance, then constructors are called from the highest class in the hierarchy from the superclass to the lowest to the subclass of the lowest level. Given the four classes with the names A , B , C , D. Class A is a superclass for class B.

Class B is a superclass for class C. Class C is a superclass for class D. A reference to a subclass object. Calling the superclass constructor. The keyword super Contents 1. Is it possible a link to a superclass assign a reference to an object of a subclass? Is it possible a reference to a subclass assign a reference to a superclass object?

What are the forms of using the super keyword? How is a call made from a subclass of a superclass constructor? The keyword super 5.