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Question 1

7votes

3answers

550views

What SOLID principles does the Java List interface challenge?

The Java List<E> interface includes methods, such as add(E) and remove(Object), that work as the names suggest on instances of mutable concrete implementations, such as ArrayList<E> and ...

Ellen Spertus

1,007

askedOct 19 at 21:21

Question 2

2votes

1answer

200views

Is widening parameter types in a PHP interface implementation a good practice?

I have an interface defined as follows:interface MyInterface{ public function setMyMethod(int $a); public function getMyMethod(): int;}And I have a class that widens the parameter type:...

Joao M

131

askedJan 10 at 22:17

Question 3

5votes

7answers

586views

Exceptions and the Liskov Substitution Principle

Consider the following scenario.I have an interface IService:public interface IService{ void DoSomething();}with an implementation:public class Implementation : IService{ // This might ...

Codisattva

99

askedJul 27, 2024 at 10:47

Question 4

1vote

3answers

269views

In "Liskov Substitution Principle", is "invariants can't be weakened in a subtype" a kind of "postconditions can't be weakened in a subtype"?

According to Invariant rule in Liskov Substitution Principle, I know one of the form of violation of "Liskov Substitution Principle" is violating "invariants can't be weakened in a ...

wcminipgasker2023

3,003

askedJul 26, 2024 at 3:46

Question 5

2votes

4answers

316views

Does changing the default value of a class member violate the Liskov Substitution Principle?

For example, I have a Label class where the default font color is black:public class MyLabel{ protected int r=0; protected int g=0; protected int b=0; public void setRGB(int r,int g,...

wcminipgasker2023

3,003

askedMay 16, 2024 at 3:37

Question 6

1vote

1answer

149views

Can a standalone class be seen as violating the Liskov Substitution Principle

Say we have the interfaceinterface IColoredSquare{ int GetSideLength(); void SetSideLength(int length); string GetColor();}and I implement it like thisclass ColoredSquare : ...

user435820

askedMay 15, 2024 at 7:47

Question 7

3votes

2answers

417views

Invariant rule in Liskov Substitution Principle

From Liskov Substitution Principle, I am still not very clear about the invariant rule. I read through many posts but I still have doubts.My example is picked from this blog, the example is slightly ...

riki

149

askedMay 6, 2024 at 11:57

Question 8

0votes

2answers

233views

Possible violation of LSP when adhering to ISP?

Recently I read about ISP and wanted to implement it into my project. While implementing my design I think I found a flaw which violates LSP but I'm not sure.Given I have a game project, in which ...

Boudebouz1

27

askedJan 25, 2024 at 21:37

Question 9

2votes

2answers

456views

In "Liskov Substitution Principle", are "Preconditions can't be strengthened in a subtype" & "Postconditions can't be weakened in a subtype" the same?

According to Is this a violation of the Liskov Substitution Principle?, as I understand, the top answer currently says the code below is violating "Liskov Substitution Principle":public ...

wcminipgasker2023

3,003

askedOct 12, 2023 at 8:42

Question 10

-1votes

2answers

268views

Liskov Substitution Principle Edge Case

I thought I understood Liskov Substitution Principle but then I thought of a case and I wanted to ask the community here if I get it right.So I read somewhere to check if we have violated Liskov or ...

Shahbaz Khan

19

askedNov 28, 2022 at 13:27

Question 11

21votes

6answers

7kviews

Does subclassing int to forbid negative integers break Liskov Substitution Principle?

In Python 3, I subclassed int to forbid the creation of negative integers:class PositiveInteger(int): def __new__(cls, value): if value <= 0: raise ValueError("value ...

swoutch

321

askedNov 6, 2022 at 10:22

Question 12

2votes

3answers

681views

Object Oriented Programming - what is the best way to add new parameters?

I have a doubt about what would be the right OOP approach for implementing classes that do similar stuff with different parameters.To provide a simple example, I would use two polynomial classes, ...

ThePunisher

138

askedAug 12, 2022 at 14:56

Question 13

0votes

3answers

316views

Use aggregation like LSP in C++

I was reading about LSP (Liskov Substitution Principle) in a book called Clean Architecture: A Craftsman's Guide to Software Structure and Design. I have a question regarding how this would be ...

Gooday2die

21

askedMay 17, 2022 at 12:21

Question 14

3votes

3answers

487views

Is there any redundancy within the scope of SOLID principles?

I have read in an article DIP in the Wild that"When Robert Martin first discussed the DIP, he equated it a first-class combination of the Open Closed Principle and the Liskov Substitution ...

bridgemnc

261

askedMar 4, 2022 at 19:25

Question 15

6votes

1answer

4kviews

What are the examples of breaking Liskov Substitution Principle?

I'm aware that there are 4 ways to violate Liskov Substitution from here.But I'm not sure what these violations would like in practice. Can you show examples of code that breaks the principle for ...

Alexis Winters

71

askedFeb 2, 2022 at 1:28

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Stack Exchange Network

Questions tagged [liskov-substitution]

What SOLID principles does the Java List interface challenge?

Is widening parameter types in a PHP interface implementation a good practice?

Exceptions and the Liskov Substitution Principle

In "Liskov Substitution Principle", is "invariants can't be weakened in a subtype" a kind of "postconditions can't be weakened in a subtype"?

Does changing the default value of a class member violate the Liskov Substitution Principle?

Can a standalone class be seen as violating the Liskov Substitution Principle

Invariant rule in Liskov Substitution Principle

Possible violation of LSP when adhering to ISP?

In "Liskov Substitution Principle", are "Preconditions can't be strengthened in a subtype" & "Postconditions can't be weakened in a subtype" the same?

Liskov Substitution Principle Edge Case

Does subclassing int to forbid negative integers break Liskov Substitution Principle?

Object Oriented Programming - what is the best way to add new parameters?

Use aggregation like LSP in C++

Is there any redundancy within the scope of SOLID principles?

What are the examples of breaking Liskov Substitution Principle?

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