Linked Questions
12 questions linked to/from Understanding "programming to an interface"
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1
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Programming to an Interface and Keep Testability in Unique Classes [duplicate]
I try to program to an interface whenever possible, but when I have a class that fulfills a very specific and unique purpose, one that can't be abstracted. Is it correct for me to say that I've ...
- 25
0
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0
answers
111
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Heuristics/rules for programming to an interface [duplicate]
I am struggling with applying the "programming to an interface" guideline because I can't seem to decide in which situations it is necessary and in which ones it's overkill (or even counter productive)...
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176
votes
19
answers
174k
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Why are interfaces useful?
I have been studying and coding in C# for some time now. But still, I can't figure the usefulness of Interfaces. They bring too little to the table. Other than providing the signatures of function, ...
38
votes
7
answers
17k
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Should I still follow "programming to an interface not implementation" even if I think using concrete class members is the simpler solution?
According to Understanding "programming to an interface", as I understand, I think I should depend on abstract class only. However, in some case, for example, Student:
public class Student {...
- 717
36
votes
6
answers
14k
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What's the point of implementing a Stack using two queues?
I have the following homework question:
Implement the stack methods push(x) and pop() using two queues.
This seems odd to me because:
A Stack is a (LIFO) queue
I don't see why you would need two ...
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8
votes
4
answers
6k
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Why instantiate an object to a base class rather than a specific subclass?
For example:
URL blogFeedUrl = new URL("http://manishmaharzan.com.np/getJSON/json.json");
HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
connection.connect();
...
- 235
9
votes
4
answers
5k
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How to force "program to an interface" without using a java Interface in java 1.6
In java 1.8 they have wonderful new "default interface methods". In 1.6 how close can we come? The goal: use code to keep clients from being able to tell that a class is not a java interface. If we ...
- 120k
3
votes
3
answers
544
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How to "program to an interface"
I've read these questions:
Understanding "programming to an interface"
What is the point of an interface?
Does it always make sense to "program to an interface" in Java?
I don't ...
- 251
4
votes
3
answers
2k
views
Preemptive interfaces in Java - good, bad or "a matter of taste"
I frequently come across projects that strictly define an interface for each and every class. 90% of those interfaces feature only a single implementation. Proponents of these "preemptive interfacs" ...
- 159
0
votes
2
answers
1k
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What is the difference when create Set<T> in java [closed]
When creating a Set in Java, what's the difference between the following? Which one should I use, and why?
Set< T > set = new HashSet<>();
HashSet< T > set = new HashSet<>();
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3
votes
3
answers
564
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Fruit obj=new Orange(); and Orange obj=new Orange(); if both works identically in my code, which is the less coupling one?
Suppose I have 2 classes (which don't show methods to look simpler):
public interface Fruit{
}
public class Orange implements Fruit{
}
, and assume I can use 2 ways to initialize Orange without ...
- 717
0
votes
2
answers
414
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Declaration Types in OOP
I would like know opinions about the next sentence:
"In a object oriented static typed language you should declare variables and parameters as broad as possible and return types as narrow as possible"...
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