Association (object oriented programming) Puns

they all have classes.

(As a programmer, I'll use this one on my son)

I know basics of python - syntax, defining functions and working with basic data types. Mostly self taught. I want to learn some advanced python now. Like classes and objects. Are there any books or youtube channels from which I can learn?

I am from a non-CS background. Python is the only programming language I know. Plz help me techies of r/TamilNadu !!

Hi everyone! I'm having a tough time understanding and how to properly implement OOP. I got stuck so I went back to the basics of the basics. I'm talking re-reading and re-watching information on Loops, conditionals, datatypes etc. But I've reached this point again and I'm still stuck. Does anyone have any tips or resources that can help me understand how OOP works? It's tough to get an understanding of it when all tutorials or books only show implementation in regards to console applications.

If it matters, my goal with C# is 2D hobby/indie game development on Unity Engine. I've managed to make a Snake clone and my next goal is Tetris.

As I type this I have some tutorials by Brackeys queued on YouTube for basic syntax used in Unity.

Thanks for reading! :)

I have an OOP course in Java this semester. I collected some final exam questions from last year. It seems that the final exam questions are mostly based on theories. After taking a look at the questions that I attached below, can you suggest any books/resources/materials/websites or anything from where I can practice similar theory questions?

Some of the questions are as follows:

1. A try statement must have at least one catch clause or a finally block, while a try-with-resources statement may have no catch clause or finally block

2. Given int x = 2;, if(x < 2){ x++; } elseif (x > 2) { x--; } is a syntactically correct statement.

3. Given class C and two methods f and g defined as C’s member methods, removing f from class C will NOT make C’s objects smaller in the memory.

4. Given an 8-bit signed value x = (11111010)2 in two's complement, the value of x is -6 in decimal.

5. Arrays are of reference types, so given double[][] myDoubles;, the memory of myDoubles will be reset to 0’s upon its declaration

6. Composition is a part-of relation between objects and a composition relation is depicted in a UML class diagram as association with a solid diamond (i.e., ⬧) at the composite end of the association line.

7. Given definition class A{ class B {} }, statement A.B x = new B(); creates a new instance of class A.B.

8. Given a concrete class T that extends class java.lang.Thread and a variable x of type T (x != null), executing x.run(); will launch a new thread.

9. Given definitions class A {public int x = 1;} and class B extends A {public int x = 2;}, and a reference A a = new B();, statement System.out.print(a.x); compiles and prints out 1.

10. Given a method void f(int x){int temp; temp = x + 1;}, local variable temp is always initialized to 0 when f starts to execute.

11. Given a concrete class T that extends class java.lang.Thread and a variable x of type T (x != null), executing x.run(); will NOT launch a new thread

12. Given public class HelloWorld{ public static void main(String[] args) { System.out.println("Hello world."); } defined in HelloWorld.java, we can compile HelloWorld.java into HelloWorld.class. Afterward, assuming everything else works as expected, we can use the command java HelloWorld.class to run the program in the console.

13. An abstract class may implement multiple interfaces but may NOT extend a concrete class.

1

I have used some React at work - by no means an expert - and was told repeatedly that I should favor "functional components" over "class-based components". Now that I am taking a Udemy course ("React - The Complete Guide (incl Hooks, React Router, Redux)" by Max Schwarzmuller) that goes in-depth on the finer points of React - custom hooks, redux - it keeps blowing my mind how much more sleek the functional component-based features are compared to the class-based ones. Using redux with class-based components just looks shockingly bad.

I'd like if someone with knowledge about the genesis and evolution of React could tell me: is this just that the engineers who worked on React preferred Functional-style programming and so gave it a lot more love? Or is there some deeper reason why class-based components suck in React? I am primarily a Java engineer, and like thinking about classes, and it feels like the redux `connect()` method could have been made simpler to use. I know it sounds silly, but learning this material I'm sitting here thinking: is functional programming just more expressive?

Anyone here who can help with OOP basics homework done using Java ASAP. It consists of multiple choice and guided fill in questions I'll appreciat

So I'm building a game! Pretty proud of making a java app that signs up/logs in users connected to a local DB server.

Now I have a pretty good idea of what will my game do, it is similar to travian and I'm not alone in coding, my main expertise will be coding controllers and listeners.

My question is : I have a DButils class which is the brain of my sign up/login. If I were to add functionalities after logging in, such as settings for a game, number of bots etc, do I keep coding the functions recalling from DB on the same DButil and connect different controllers or create a new DB controller? I was going for the former, which is already the brain of my app as of now and build up from there. I will post the game here in the end. Thanks and kind regards

Hello, I have been struggling to learn the concept of Object Oriented Programming. Do you guys know a good place for me to grasp the concept? Thanks for all your help!

Sorry if this is the wrong place to ask. I've studied examples here and read up on factory design, factory pattern, abstract factory, & factory method; I followed a tutorial for a game that works well. But I'd like to enhance and expand it so that I can understand the fundamentals of c# and object-oriented programming. There are seven factories in the game, for example. The factories I have in-game are an item factory, a Quest factory, a recipe factory, a monster factory, a spell factory, a trader factory, and a world factory. Is it possible to implement an abstract factory that combines all the factories? I can post my code for the factories if need or would keeping them separate be best? Thank you for any assistance you may provide as well as any feedback you provide to.

Can someone describe this course and provide some idea of the level of difficulty (compared to m269, for example)?

Java imo is not as popular as it used to be and is losing ground to other more modern languages. For someone already familiar with object oriented programming, are there still things to learn to make it a worthwhile module? The module description makes it sound very basic but perhaps that's not the case?

Thanks a lot

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Been learning Python for a week now and for some reason I'm just not grasping why OOP is useful. Is it basically used for organizational purposes?

Maybe if I could get a simple example when OOP would be advantageous to use it might makes it's purpose more clear.

Hi guys! I've been learning Python for 1 month ago and I've been enjoyed it a lot!

But, in my course, I started learning Object-oriented programming, and it's really difficult, so I don't know what to do.

Is it really necessary to learn OOP or is there another way to avoid it ?

I have a very stupid but important question. I was learning more about oop in python but all the examples I saw (like employee directory etc) I feel could be easily done using databases.

So why would someone use oop? scratching my head thinking about this

Hi guys, currently I'm learning programming in Java at MOOC, and I am at Part 5, Objects and References.

https://java-programming.mooc.fi/part-5/4-objects-and-references

Until that point most of the stuffs went allright, but now everything is confusing. I can create basic classes (for example Book book1 = new Book (String author, int pages), that's okay, but the most problematic parts are "Object as a method parameter", and "Object as object variable". Everything is really abstract. I think I have to reinforce the stuffs I learned so far.

Could you please recommend me online resources which could teach me the most important concepts of this part? Or do you have any advice how to handle these stuffs?

MOOC is great, but at this point it is not a big help.

Thank you!

I have an OOP course in Java this semester. I collected some final exam questions from last year. It seems that the final exam questions are mostly based on theories. After taking a look at the questions that I attached below, can you suggest any books/resources/materials/websites or anything from where I can practice similar theory questions?

Some of the questions are as follows:

1. A try statement must have at least one catch clause or a finally block, while a try-with-resources statement may have no catch clause or finally block

2. Given int x = 2;, if(x < 2){ x++; } elseif (x > 2) { x--; } is a syntactically correct statement.

3. Given class C and two methods f and g defined as C’s member methods, removing f from class C will NOT make C’s objects smaller in the memory.

4. Given an 8-bit signed value x = (11111010)2 in two's complement, the value of x is -6 in decimal.

5. Arrays are of reference types, so given double[][] myDoubles;, the memory of myDoubles will be reset to 0’s upon its declaration

6. Composition is a part-of relation between objects and a composition relation is depicted in a UML class diagram as association with a solid diamond (i.e., ⬧) at the composite end of the association line.

7. Given definition class A{ class B {} }, statement A.B x = new B(); creates a new instance of class A.B.

8. Given a concrete class T that extends class java.lang.Thread and a variable x of type T (x != null), executing x.run(); will launch a new thread.

9. Given definitions class A {public int x = 1;} and class B extends A {public int x = 2;}, and a reference A a = new B();, statement System.out.print(a.x); compiles and prints out 1.

10. Given a method void f(int x){int temp; temp = x + 1;}, local variable temp is always initialized to 0 when f starts to execute.

11. Given a concrete class T that extends class java.lang.Thread and a variable x of type T (x != null), executing x.run(); will NOT launch a new thread

12. Given public class HelloWorld{ public static void main(String[] args) { System.out.println("Hello world."); } defined in HelloWorld.java, we can compile HelloWorld.java into HelloWorld.class. Afterward, assuming everything else works as expected, we can use the command java HelloWorld.class to run the program in the console.

13. An abstract class may implement multiple interfaces but may NOT extend a concrete class.

1