Have you flustered in a recent technical interview or are you preparing for an up-coming interview? Many high-tech companies are screening candidates using textbook questions before bringing them in for further interviews. This article contains typical questions that interviewers will ask. Pay attention.
The two have significant differences, but also share many similarities. Hence, many people confuse and even interchange the two. This is not correct.
When one refers to polymorphism, one refers to the ability to interchange one definition with another possibly different definition, but which both share the same abstracted structure (interface). This allows for substitutability, which is the basis of inheritance and defines super and sub classes.
Hence, inheritance is a by-product of polymorphism. Inheritance is the ability of one class to be a subtype of some other super class.
Do not confuse the two, as inheritance only refers to subclasses having all of the abilities of its parent classes. While polymorphism means substitutability, which includes inheritance.
Overriding occurs when a subclass uses the same method signature and name as an ancestor's class method but provides an alternative definition.
Overloading, on the other hand, uses the same name for a method but a different signature. For example, having three parameters instead of two.
Classes are holders of implementations (unless you refer to abstract classes, also known as pure virtual classes). Whereas interfaces provides a public structure for users to interact and change the state of the object.
This is not a hard question, but you need to answer this correctly or your world will turn upside down like a stack, or was it the heap?
Both the heap and the stack represent memory locations in memory. Although implementations may vary, the stack usually grows downwards from the top of the allocated memory, while the heap is a group of addresses near the bottom (that typically grows upwards as necessary). This is used to maximize the available memory before a collision occurs.
The stack is often used for functionality such as function calls and returns. While the help is used to allocate additional memory during runtime that normally does not fit on the stack.
You should be able to ace the interview.
, everyone has their pfcrerenees and styles when it comes to coding. And in the CF world there are those who prefer strong typing and those who don't. And we just happen to fall on the opposite sides of that fence. I just felt that it came across in the podcast that to do OO in ColdFusion you SHOULD use interfaces (even though you might not have intended it to come across that way), and I think it's important for people to know that there are different ways for people to implement OO in ColdFusion and that it doesn't make your code any less OO if you don't use interfaces. (And as much as I respect you, Mickey, I don't think it's cool to dismiss people's points of view as nonsense , be they Helms/Corfield, or Joe Blow Developer. We should all keep an open mind about stuff, as you yourself said in the last podcast).My experience was coming from front-end HTML/JS development to back-end procedural CF development before I got into OO CF. I don't have any experience with statically-typed OO languages, which is probably why I had such a hard time seeing the point of hard typing and interfaces in a dynamically-typed language. Whereas I can see why people with a Java or C# background coming to CF would prefer to use interfaces because they are used to that sort of thing. When I first started doing OO, I hard-typed everything, but then when I switched over to duck typing I found that it gave me a lot more freedom and it just fit a lot better to the way I do things and I experienced no drawbacks, really. I�m not saying everyone should do things my way, but it�s just one way of doing things.A couple of other points:Mikey, I am not against �coding to an interface�. I think that�s really important. But people should realize that �coding to an interface� is a principle of OO programming and doesn�t necessarily require the use of �interface� (the language construct).Brian � you mentioned that strong typing gives the developer the benefit of type-safety at compile time. That�s true � in Java! In CF, there is no compile step, so any errors you run into are going to happen at runtime. Hard typing an argument in a CFC isn�t going to prevent you from accidentally passing in an object of the wrong type in your code and you won�t catch that until runtime. Just like if you duck type your argument and you accidentally pass in an object that doesn�t have the right method signatures, you�ll get a runtime error.Also, my opinons about interfaces aren�t just because I�m blindly following Helms and Corfield. But once I found out that these CF �luminaries� (who also have a lot of experience on other dynamic and static OO languages) shared my views, I felt more confident that I wasn�t way off with what I was thinking.
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