Improve this answer. Robert Robert 4, 8 8 gold badges 40 40 silver badges 87 87 bronze badges. The implementation hasn't changed, especially not at runtime.
Animal is just a type annotation on the reference variable a , and new Dog is an actual object. Choosing a method at runtime is not the same as "implementation changing at runtime". RoyiNamir Your implementation remains the same on either account. Even though the decision is made at runtime it is still on one instance of that object not on the overall behavior of the implementation. The implementation itself is polymorphic and contractual. The instance itself is referenced and acted upon — Robert.
Show 4 more comments. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Featured on Meta. Now live: A fully responsive profile. Linked Related Hot Network Questions. Question feed. The interface itself just contractually obligates the child objects to walk.
The interface itself is just a contract which you nailed in your question. The polymorphism comes from the methods on the contract. The interface contract is the agreement that holds the methods terms of service or use. So each contract hold the terms that are the polymorphic behavior.
IAnimal in this case is just a contract that does not contain polymorphic behavior. IWalk and ITalk promote polymorphism.
I am not going to attempt to answer everything in this question, it is just too large. Having said that here are some observations about the code you posted which might help:. Having skim read the code you posted, my overall recommendation is to go back to the drawing board. They are both very different, but there is a lot to learn from both and CUSP is built on top of Thrust, which makes it even more relevant to your usage case, I suspect.
Below is concrete example of the "Observer" pattern, using classes and interfaces to accomplish polymorphic behavior in a logger system:. What you describe is a way to implement the strategy pattern. You also describe how to implement a whole lot of different designs, since there are many, many reasons why we might want to create a common interface, make different implementations, and select one at runtime for different situations.
But, you know, a design is not code. A design is a mental model of how the software works -- a human thing, not bits. A design pattern is a common way of composing solutions to common sorts of problems. Again it happens in your head and not in bits. The strategy pattern in particular is about making objects with interchangeable algorithms , any of which could be used for a particular purpose. The purpose of operator overloading is to provide a special meaning of an operator for a user-defined data type.
You can also use operator overloading to perform different operations using one operator. We use function overloading to save the memory space, consistency, and readability of our program. Function overloading shows the behavior of polymorphism that allows us to get different behavior, although there will be some link using the same name of the function.
Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters. Skip to content January 21, Joe Dassin. How do you implement polymorphism?
How do Interfaces support polymorphism? What is an example of polymorphism? What is the concept of polymorphism? How do you explain encapsulation in interview? How does polymorphism promote extensibility explain with example? Why overloading is called compile time polymorphism? What is the difference between static and dynamic polymorphism?
What is compile time polymorphism explain with an example? What is function overloading explain with an example?
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