Student needs quick help for his exam in Java

[glad gazelle]

Hey, I need help for a Java exam, which is on tuesday. I watched some tutorials, but still need help. I kind of know already what they could ask me. You see it down below

Usage example

A customer such as DB Fernverkehr commissioned the implementation of a new software solution for monitoring trains during ongoing operation. For this, the software first needs to know the inventory of the vehicles, that is, the trains.

For the tool inventory that requires the following requirements, it is first necessary to develop a technical Java class model.

-> Each train is specifically either a long-distance train or a regional train, but other types may be added later
-> Each train consists of a locomotive and wagons, but how many there may be is not yet defined.
-> All components of a train must have an identification number, which can contain both numbers and letters
-> Every locomotive (or locomotive) has a drive. The possible drive types are fixed, i.e. a defined set of values.
-> Wagons are also of a specific type, such as passenger wagons or freight wagons. New species may be added here over time.

Part 1 (group work)

Create a small classroom model based on the information above

-> Classes: train, locomotive, wagon, long-distance train, regional train, passenger car, freight car
-> Attributes: id number (string), driver (enum)

Reference class model
link:diagrams/exam-classmodell-scenario-1.pum1[]

Part 2 (Theory and Knowledge)

In the context of the above task:

-> Questions...
-> Integration of abstract classes into the model if they are not included yet
-> Classes, attributes and their visibility
-> What kind of vibration collection can you use to manage trains and why
-> Options to filter trains (foreach+-if(), stream+foreach(), SQL- Where)

[molten cedar]

<@&987246746478460948> please have a look, thanks.

Here is an AI assisted attempt to answer your question 🤖. Maybe it helps! In any case, a human is on the way 👍. To continue talking to the AI, you can use </chatgpt:1108714622413963314>.

TJ-Bot

Hey, I need help for a Java exam, which is on tuesday. I watched some tutorials, but still need help. I kind of know already what they could ask me. You see it down below Usage example A customer such as DB Fernverkehr commissioned the implementation of

hould focus on understanding the basics of Java programming, such as data types, variables, operators, loops, and conditional statements. Make sure you are familiar with the syntax and semantics of Java, as well as how to write and compile simple programs.

It's important to practice coding exercises and problems to solidify your understanding of the concepts. You can try solving problems on websites like LeetCode or HackerRank to improve your problem-solving skills.

Additionally, make sure you understand object-oriented programming principles such as classes, objects, inheritance, polymorphism, and encapsulation. These concepts are often tested in Java exams.

Lastly, review any specific topics that you think might be covered in the exam. This could include exceptions handling, input/output operations, or collections framework.

If you have any specific questions or need help with a particular topic, feel free to ask in the discord server. Good luck with your exam!

- AI generated response

[gusty raptor]

And what's your question?

[glad gazelle]

So, I need to create classes related to the case above.

[short viper]

ok and what is stopping you as of right now?

[uneven oxide]

paste it in chat gpt

it should spit out the code with explanation 😎

[short viper]

thats not helpful

and not learning

even with explanation its not really learning

[uneven oxide]

hu

h

[short viper]

more spoonfeeding

[uneven oxide]

bruh

ok then do what u know and use fourms to help you fix probelm

👍

[glad gazelle]

I have no idea where to start. The exam has 2 parts. 1. part is a group work with 2 other students, where we need to discuss how to do these things.

2. part is about the knowledge in java. They will ask me things about Classes, attributes, abstract classes?, which collection I could use to manage trains, and some filter system

[glad gazelle]

I dont think so 😄

[gusty raptor]

That's really not a good answer Splash, they should learn the fundamentals to be able to do the exam themselves.

[uneven oxide]

xd its quickest solution to exam

but prolly not good long term

my bad

[short viper]

you dont have access to chatgpt in exams

so its not really helpful

[uneven oxide]

yeah thats

[gusty raptor]

Please take a look at the guidelines around giving advice on this server.

[uneven oxide]

ok

[glad gazelle]

true, but I only got 2 days, since the exam is on tuesday.

[uneven oxide]

welp rip

[gusty raptor]

You can still dive into the basics. We can help explain concepts if you have specific questions.

[glad gazelle]

what I understand from the text is, that we have 2 different types of trains. We got long-distance trains and a regional one

[gusty raptor]

In case you course material is lackluster you can check out:

[uneven oxide]

i dont think its possible to learn that much in 2 days

[molten cedar]

MOOC is a completely free introductory Java course created by the University of Helsinki, it is a great way to learn Java from the ground up.

It consists of two parts, one at beginner, and another at intermediate level. The end of the course is marked by creating your own Asteroids game clone!

Even though the instructions show how to configure and use NetBeans for the course, you can use IntelliJ. To use IntelliJ, simply install the TMC plugin by opening IntelliJ -> File -> Settings -> Plugins and searching for TMC. You will then be able to use IntelliJ to complete MOOC.

Visit MOOC here: https://java-programming.mooc.fi/
(the course is available in both English and Finnish)

simon_verhoeven • used /tag id: mooc · Apr 28, 2024, 6:55 PM

About the course - Java Programming

About the course - Java Programming

[short viper]

depends

[uneven oxide]

i mean this sounds alot

[short viper]

but in that case start earlier 🤷‍♂️

[gusty raptor]

You can get a lot done, either way it's not a helpful answer.

[glad gazelle]

I am a dual student, so we have much going on in my uni :), we are writing 5 exams in 2 weeks

[uneven oxide]

https://www.w3schools.com/java/java_class_attributes.asp

read this should help part 1

[short viper]

that website is kinda meh though

[uneven oxide]

i learnt from w3schools xd

it didnt give technical stuff

[glad gazelle]

w3schools is good for the basics yes

[uneven oxide]

just how to do the concept

yeah

[uneven oxide]

part 1 is just making classes with attributes

it doesnt seem complicated

[glad gazelle]

the chance is high that the exact same case will be asked in our exam, since the one I posted is from the previous class

Maybe I can copy and paste the solution, if some experienced java developers can help me to solve it

[uneven oxide]

Create a small classroom model based on the information above

-> Classes: train, locomotive, wagon, long-distance train, regional train, passenger car, freight car
-> Attributes: id number (string), driver (enum)

[short viper]

Create a small classroom model based on the information above

-> Classes: train, locomotive, wagon, long-distance train, regional train, passenger car, freight car
-> Attributes: id number (string), driver (enum)
what do they mean by small classroom model?

[glad gazelle]

class model

[uneven oxide]

class Model?

[short viper]

ok yeah

[uneven oxide]

with that info used in there?

[glad gazelle]

i translated it from german to english

[short viper]

lmao

[gusty raptor]

Please do yourself a favour, and actually study the material. Otherwise you'll just struggle next period.

[uneven oxide]

must Model be a class

https://www.w3schools.com/java/java_class_attributes.asp is answer

[short viper]

ok so what do you tried so far to do that task?

[glad gazelle]

I will, but the time is always limited and I focused on other subjects.

[uneven oxide]

how much hours of sleep do you get

[glad gazelle]

not much, I watched couple Java tutorials and learned some stuff about inheritance and classes

I wrote an exchange calculator

[glad gazelle]

6

[short viper]

how is that important?

[uneven oxide]

i was gonna say take some hours off sleep

and study java

😈

but 6 isnt that much

[glad gazelle]

I can sleep, after the exams

[short viper]

do you even know what you should do in that task?

[glad gazelle]

Yes

[short viper]

so what is stopping you?

I dont get it

[glad gazelle]

Lemme try to explain

[short viper]

hard to help that way

[gusty raptor]

Please take a look at the course I linked, it will better explain what you need to do. @uneven oxide please stick to relevant, helpful input.

[uneven oxide]

nice

[glad gazelle]

I dont have the experience to solve it from my own, I need more time to study Java and in 2 days It wont be enough. thats why I said, it might be better to get help from someone experienced, who do it with me, so I can study this case only and know what to say, if I get asked

[gusty raptor]

Try to start writing what you can, and we can review what you wrote.

We're not a code writing service, but we can guide you based upon what you wrote.

[glad gazelle]

actually, we dont need to write the whole programm at all

[short viper]

that makes it easier

[glad gazelle]

We just need to tell how we would start and how we would do it

[uneven oxide]

@glad gazelle -> Classes: train, locomotive, wagon, long-distance train, regional train, passenger car, freight car -> Attributes: id number (string), driver (enum)for this do all of these classes need to have the same attributes

[glad gazelle]

okay, so the attributes would be strings?

[uneven oxide]

no i ment

like for each vechile

does it need the same attributes

[glad gazelle]

at this moment, there are only 2 vehicles. a long distance train and a regional train

[uneven oxide]

ok nice

what data types do they store?

[glad gazelle]

they both probably should contain passengers, distances etc.

[uneven oxide]

string id & driver?

hmm ok

like max distance

& min distance

?

[main bison]

i'd suggest u both read the assigment again :p

[uneven oxide]

what info about he passengers?

[glad gazelle]

each train consists of a locomotive and waggons, but its not defined how many waggons. But each train needs to have 1 locomotive

[glad gazelle]

why?

[main bison]

Each train consists of a locomotive and wagons, but how many there may be is not yet defined.
-> All components of a train must have an identification number, which can contain both numbers and letters

[uneven oxide]

Part 1 (group work)

Create a small classroom model based on the information above

-> Classes: train, locomotive, wagon, long-distance train, regional train, passenger car, freight car
-> Attributes: id number (string), driver (enum)

Reference class model
link:diagrams/exam-classmodell-scenario-1.pum1[]

huh

[main bison]

dont assume things, know what's on the assigment

[uneven oxide]

i didnt see that

wtf

[main bison]

that's because u went gung ho on suggesting gpt etc 😉

Wagons are also of a specific type, such as passenger wagons or freight wagons. New species may be added here over time.

[uneven oxide]

i read part 1

not above that

[main bison]

so u got 2 type's of classes, each with different versions

[uneven oxide]

[glad gazelle]

Yeah so, in the end, the software needs to know the inventory of the vehicles. We need to develop a java class model for it

-> Each train is specifically either a long-distance train or a regional train, but other types may be added later
-> Each train consists of a locomotive and wagons, but how many there may be is not yet defined.
-> All components of a train must have an identification number, which can contain both numbers and letters
-> Every locomotive (or locomotive) has a drive. The possible drive types are fixed, i.e. a defined set of values.
-> Wagons are also of a specific type, such as passenger wagons or freight wagons. New species may be added here over time

these are the requirements

[uneven oxide]

hm ok

[glad gazelle]

different versions, because 2 different vehicles?

[main bison]

same with wagon

what your looking at is a basic inheritence / composition excerscise

[uneven oxide]

so you need to create alot of objects that will be inherited into an train class

[main bison]

Regional extends Train, LongDistance extends Train

[uneven oxide]

yeah

[main bison]

passeger / freight / whatever extends wagon

[uneven oxide]

😵‍💫

[main bison]

Directly covers your next part

-> New species may be added here over time

[uneven oxide]

it isnt hard its just alot of stuff to do

[glad gazelle]

we got 1 hour

[uneven oxide]

https://www.w3schools.com/java/java_inheritance.asp this is very relevant please i think

[main bison]

it all comes down to reading

like the engine, that's composition

[uneven oxide]

its bascially the same

thing

but yours needs more objects

[main bison]

also , if i see correct u do not even need code

[uneven oxide]

huh

[glad gazelle]

what does the extend mean? is it like: wagon contains the attributes: passenger, freight ?

[glad gazelle]

true

[main bison]

its just the design he needs @uneven oxide , its clearly stated in the assigment

[uneven oxide]

oh

[short viper]

also if you want to read about inheritance and composition you might want to check these:
https://www.baeldung.com/java-inheritance
https://www.baeldung.com/java-inheritance-composition

[glad gazelle]

there is even a reference classmodel link, but I got no idea how to open the link

link:diagrams/exam-classmodell-scenario-1.pum1[]

[uneven oxide]

is this an email

or what

[glad gazelle]

No, its the link to a uml of the classmodel

[main bison]

probably some online diagram builder

[glad gazelle]

can I open it in IntelliJ?

[uneven oxide]

i ment how are u reading that msg

send screenshot

[main bison]

righto, keep forgetting that one exist. << StarUml fanatic :p

[gusty raptor]

Just a linked plant uml file.

[glad gazelle]

its from github I guess

[uneven oxide]

oh

[short viper]

then its in the github repository ig

[uneven oxide]

try github.com/repo/diagrams/exam-classmodell-scenario-1.pum1

he probably made a format error

[main bison]

if u cant open it, its just text then if its plant

[glad gazelle]

not wokring

[short viper]

is there a diagrams folder in the github repository?

[glad gazelle]

yes

[uneven oxide]

did you replace repo with the actual repo

[short viper]

open that folder

the file should be in there

[glad gazelle]

But he makes a new repository for each class,

[uneven oxide]

he made a formatting error

😡

[glad gazelle]

there are 2 diagrams, but not the one from this case

[uneven oxide]

@glad gazelle what is the repo called

[short viper]

well those two are probably correct instead

[glad gazelle]

https://github.com/ThorstenEckstein/programmierung2-W3WI-109-ss24

Oh wait I found smth

there is a exam preparation folder

he took another example there.

[main bison]

The example posted is not that hard to design, just have to read carefully and not skim to fast

[glad gazelle]

so How should i create that java class modell

[main bison]

start with the main class and then the subclasses

by the time u have drawn those 2, some idea's will start to form on how to handle it

[glad gazelle]

The main class inherits to subclass right?

[main bison]

And as your limited to methods and access aswell due to your course, try to stay within limits

the main class is the one that manages the trains in total

which has composition of the other classes or collections and / or interfaces

on the main program there's no real info given so u need to wing it a few methods

the main details given are on the trains themselve so make sure that part is defined in a way it can be extended

[glad gazelle]

hmmmm