10 Most Common Java Developer Mistakes

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In this video, we'll be discussing the top 10 most common mistakes that Java developers make and how to avoid them. As a Java developer, it's important to stay on top of your game and avoid these common pitfalls to ensure your code is efficient, effective, and bug-free.
So, whether you're new to Java development or a seasoned pro, this video is a must-watch. Don't let these common mistakes hold you back from writing high-quality, efficient code.
Tune in now to learn how to avoid these top 10 most common Java developer mistakes.
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⭐ Table Of Contents ⭐
===========================================
00:00 - Intro
00:21 - Deleting inside Loop
03:12 - Generics
05:08 - Equality
06:19 - If Statements
07:36 - Ternary If Statement
08:39 - Static
09:43 - Switch Statements
10:51 - Try with resources
12:15 - Excessive Garbage Allocation
13:09 - Nulls
14:36 - Libraries
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27 май 2024

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Комментарии : 148

@masterdjon Год назад

I'm a senior software engineer and I didn't need to listen to this video, but I did. I positioned myself as a beginner and I found your video really interesting. The method of iterative corrections (in the "bool == true" example) is awesome. People learn and retain better this way (from my experience). I would like to express an amelioration you could do: give reasons why this or that is better and I also would tell in which circumstance. Example: In the ternary example, I do prefer one liner too, but only if it is short. And moreover, why there was a mistake (because, in fact, in terms of code execution, there is no difference at all)? (This is not a question to answer here, I already have the answer). That's it! Great video!

@KidJV Месяц назад

i too prefer one liner as long as it is readable else give me an if-else

@MrMineadrian Год назад

Since java 14 (i think) we can write switch statement using ->. for example: switch (caseIndex) { case 0 -> System.out.println("zero") case 1 -> System.out.println("one") default -> System.out.println("sth") } and using that we don't have to add break statement

@ReasonableRadio Месяц назад

that's not too bad. Is it ever really necessary to have a switch statement in the first place though? I suppose it allows you to skip the step of having a table if you're truly just processing a unique output

@zazahead Год назад

Good Information! The only thing I think is important to mention additionally is that in the first example, you should also check for null values to avoid a NullPointerException. In general I think just comparing Strings with equals without considering null values is one of the most common beginner mistakes!

@salawujonathan6722 Год назад

Exactly. NullPointerException is one of the most common exceptions in the language.

@ilhomjonaxmatov6714 Год назад

thanks for the info. But I think it would have been much easier to use the "new switch expression" available since java 12, if we used that our code would have been switch (caseIndex) { case 0 -> sout("zero"); case 1 -> sout("one"); case 2 -> sout("two"); case 3 -> sout("three"); default -> sout("default") }

@moromann1 Год назад

Cool! I didn't know that! Is it only when the case is a one-liner?

@rvbsm Год назад

@@moromann1 not only. Just use curly braces if code is longer than one line

@KingstonFortune Год назад

yes! same thing came to mind immediately I saw the switch

@schleuxy2 Год назад

From my side its can be better by return ning the value and apply the sout outside the switch. Because in this actual case thé switch is doing two things so its not single responsibility. If after you need only the values without print them you would have to create à New method to do the same thing. Or you would have to refacto your code to what I proposed before.

@soniablanche5672 Год назад

I wouldn't even use a switch for this, just a simple array. String[] numbers = {"zero","one","two","three"}; if(index < 0 || index > numbers.length) { return "default"; } return numbers[index];

@Apopjak Год назад

I am very new programmer, I took Amigoscode Java Master Class and I can proudly say that I am not doing not even one of these mistakes because the course taught we well. Thanks buddy! Now I see how the powerful your teaching really is

@YaroMalik 3 месяца назад

Is it paid?

@ITZollx Год назад

Good format mate, knew some but certainly not all... fun to follow along.

@hiro6164 Год назад

i started learning java 5 months ago and just found your channel

@smarttrupti2007 Год назад

Thanks for sharing such nice quick tips. Can you please make detailed video on garbage collector in java and optionals topics, please? Appreciate your explanations 👍

@gokuls2293 Год назад

Man i just love watching ur videos, learnt a lot of standards from ur code review videos. Currently i am planning to change jobs and quite afraid that i am not up to the level. :(. Keep posting these videos, i learn a lot from you, Thank u for everythiing

@yhwh7346 11 месяцев назад

Thanks for this, comrade! Excellent summary

@GianfrancoTerrazzano 6 месяцев назад

Really amazing, man! As junior developer I really want to thank you for the tips.

@zip3144 Год назад

12:09 you can write do-while loop instead the while loop to make it good concepts of loops

@ms-pf9ow Год назад

Learned a lot, thanks Nelson

@jeffersonfreitas4554 Год назад

Very usefull tips. Thank's!!

@muoiomanuel4708 Год назад

5 Months ago, I started studying cs in university, i still have no clue about coding... (lol) Afters seeing your video, i got smarter. Nice teaching!

@hamidoyempemi27 Год назад

Thanks for the lessons man. May Allah reward you abundantly.

@developer_hadi Год назад

Many things looks similar to JavaScript, I'm thinking of learning Java after mastering JavaScript

@houssemmhamdi1137 Год назад

Salam Bro, This is very helpfull, barak allah fikom, eid mubarek

@mattstyles4283 Год назад

4:45 Worth stressing how important it is to use interfaces. This is a very simple example, but if it’s being passed around your codebase as the concrete implementation, that’s a lot of places you’ll need to change if you decide to use a different implementation… The same is true for when you use third party libraries, database etc. You will usually want some interface to that code

@IvanRandomDude Год назад

Sounds like 2 sec job using any decent code editor

@jihedbouchnak Год назад

wow realy good work thanks a lot i love to see tips and optimisations

@isahbala2540 Год назад

Very helpful in fact at the right time against cosc211 Java OOP exams we'll have tomorrow.

@mookayreet8518 Год назад

keeeeep doing theeeese short clips. I love them. Thanks

@pablopronsky7364 Год назад

great content amigo!!!! hope you are doing great!!!

@flaviuvanca9289 8 месяцев назад

Hey @Amigoscode, I have been watching your channel for a while and I think it's the best Java programming channel on RU-vid. Keep up the hard work and wish you all the best.

@786Peacelover Год назад

Asalamu aliakum wr wb. MashaAllah.. Love the content. May Allah make you Mufti Menk in programming. Love to hear your advices.

@irmuunirmuun3580 11 месяцев назад

really helped me thanks a lot

@Maged_Mohsen Год назад

Thanks for the video and Ramadan Mubarak, brother!

@navedakther4039 Год назад

I literally laughed for 5 mins after seeing the thumbnail 😂😂

@Starchaser38 Год назад

I was staring at it a few seconds thinking "Who in the world compares a datatype and a value??" 😂

@pyroandi6797 Год назад

@@Starchaser38 In Java it's boolean, you probably thought about some other language like C :D

@Starchaser38 Год назад

@@pyroandi6797 Yes, I come primarily from C/C++ 😅 Those were very hilarious few seconds, before I realised about the different type names 🤣

@JamesRitala Год назад

Great piece of info for Java developers.

@michelchaghoury9629 Год назад

Can you please make a video about event-driven architecture with Spring Boot and Axion Framework please ? and thank you

@arulkumar_ap Год назад

Hai brother, very useful your videos thank you so much... Please make video relate to Java Design patterns

@bakhtiyor_sulaymonov Год назад

Thanks for the video

@rajkhare5949 Год назад

thanks for the nice tips!!!

@caffeinejavacode1475 Год назад

nice to hear you, maestro :)

@freetiime5444 2 месяца назад

Thank you a lot for your video. I am interested in your course master class, but it is a little high course. Do you provide any ways to get coupons?

@valentineezerins6888 Год назад

Can you make separated playlist for same videos, pls? Also thank for video i will share this with some collogues which cant write good code

@user-ig5bf9ps4x 2 дня назад

Thanks Amigos

@kalaimaranmadhavan4182 Год назад

Thank You man

@hadiya2.016 Год назад

بارك الله فيك!

@gleitonfranco1260 Год назад

Top tips! 💡

@AyraSikil Год назад

Thanks for your videos! BTW, I was thinking about this situation: there's an enum for statuses - and I was writing a method, that would make something depending the enum and then return enum.toString - but formatted to a more common format - first letter capital, than all letters in lower case, and _ replaced with spaces. What would be a better way - using StringBuilder, or getting substring(0,1) + substring(1).toLowerCase().replaceAll etc.?

@KingstonFortune Год назад

might as well use streams...

@KingstonFortune Год назад

Arrays.stream(Status.values()) .map(s -> s.getVal().substring(0,1).toUpperCase() + s.getVal().substring(1)) .map(c -> c.replace("_", " ")) .forEach(System.out::println); enum Status { ON("available"), OFF("offline"), BUSY("brb"), CALL("in_a_meeting"), DND("do_not_disturb"); final String val; Status(String s){ this.val = s; } String getVal(){ return val; } }

@firaskedidi9868 Год назад

God bless you brother 🙏

@thembamakinita5526 Год назад

For next Video can you Kindly show us how to make our spring docker images connect and communicate with non-dockerized applications or databases

@cdhagen Год назад

1:30 surprised that you didn't touch on .removeIf() method that is present on all Collection subclasses. It's much less cumbersome than using Iterators and basically a one-liner. Functional trumps imperative style.

@Jazzon234 Год назад

He mentioned .removeIf() on 3:08 but yeah it was quite short explanation and can easily be overseen.

@praveens2272 Год назад

I think I could consider myself as a senior developer because whatever you explained in this video i know all of these.

@alaaitanii 5 месяцев назад

وعليكم السلام! جزاك الله خيرا!

@emanueltanase6638 Год назад

A very useful video! Can you make one with common mistakes in Spring boot?

@finelooksfashion2732 Год назад

Literally it's the video before this one..

@ReasonableRadio Месяц назад

Huge bait that you have a switch statement and the approach is "don't forget to make the syntax the same" rather than bleach your code

@kundaimusindo5658 Год назад

Hi bro i am writing an ecommerce site using Java for backend. What better way to store product images.

@sirojiddinsaidov3657 Год назад

MashaAlloh. JazakAllohu xoyron

@shehzadamalang969 Год назад

Very help full video, your explanation very easy to learn n understanding. Sir amigoscode you mostly use intelji idea but now which editor is this? this is nice because we can see all method in the class very easily. please let me if every person know about that thanks

@xiaotao9319 Год назад

still intellij idea,but use [structure] window instead of default [project] window,u can find it on the top of ur intellij idea menu,choose Views -> tool window -> structure

@alexisantonindioulo4225 Год назад

you can also use Vscode

@talbiabdelali5914 Год назад

Thanks bro

@nnoliraphael5448 Год назад

Amazing content as usual

@sridhar3623 Год назад

Amazing your java programming videos I have one doudt of oops concepts Give me one real time examples video , like gaming topics example on oops

@alexanderkomanov4151 Год назад

Awesome!

@mohammadtoficmohammad3594 Год назад

thanks brother

@23ZeuZ23 5 месяцев назад

Optional blew my mind

@lovetheentertainment9949 Год назад

👇👇🙏🙏🙋‍♂️🙋‍♂️👇👇 Need clear video on how to store date and time seperately into Database table columns For example: patient take appointment for doctor on particular day and time and also update them Can you make a spring boot angular app explaining this And also how to store date and time seperately using rest API

@rydmerlin Год назад

Interesting that Java does not let you get a reference to the iterator in a for loop that internally uses an iterator.

@tanveerbaba1155 Год назад

My grandfather used to wear that type of cap😅😅❤❤…. Love from kashmir❤❤❤❤

@Md_sadiq_Md Год назад

Pushing the algorithm ❤

@OffdayTherapy 7 месяцев назад

Awesome content

@friedec3622 Год назад

"Don't return null, it's bad" JavaScript: Invent undefined

@eskos4338 Год назад

great video!... but i wouldnt really agree with the ternery example return age >= 18 ? "Adult" : "Child" -> it is a very short way of writing the right logic but just isnt simple even if you are familiar with this expression i prefer the "if else" variant its easier to read

@alexisantonindioulo4225 Год назад

write less and do more

@eskos8031 Год назад

@@alexisantonindioulo4225 and therefore be more cryptic ... If you are writing the code for machines yes... But usually human beings will read the code

@yaphetb5717 Год назад

I start watching Nelson's videos after I smash the likevbutton first😆.

@salmanpatel2968 9 месяцев назад

superb you are

@joaoruss0 Год назад

BTW, new UI's default dark theme is different only on MacOS, Windows and Linux have the same color scheme. Unsure why.

@Apopjak Год назад

my intelliJnew UI is much darker tho. Windows 11

@joaoruss0 Год назад

I think I know why, "Edit color scheme -> Dracula Contrast"

@soheilrf4280 Год назад

what is your intelliJ theme in this video?

@sharadsingh2856 Год назад

Awesome

@nikolaik.3489 Год назад

awesome

@user-el7fr6if3e Год назад

great content amigos, well done

@isaacwhiz Год назад

Kareem Ramadaan. Thanks bro

@faizan346 Год назад

good to know that I don't do these mistakes.

@ExSpoonman 7 месяцев назад

The thumbnail def looks like something you'd expect from Java devs 😂

@khalidessamoudi2291 Год назад

How can I communicate with you brother directly thanks

@nurmuhammadikhsan5876 Год назад

my company started migrating all java code to kotlin, is that a great decision?

@stalker200368 Год назад

Yes, kotlin is java on steroids

@glaze4629 Год назад

Kotlin and Java are almost 100% interoperable, aside from a kotlin module for some libraries to work with it, you'll enjoy it a lot

@17_hariprasath.j41 Год назад

Bro is it possible to build a website using Java .

@alienwarex51i3 Год назад

Yes

@17_hariprasath.j41 Год назад

@@alienwarex51i3 how

@17_hariprasath.j41 Год назад

@@deadw1nter679 ohh okie thank you

@alienwarex51i3 Год назад

@@17_hariprasath.j41 Spring Boot, JPS.. Apache Tomcat. Lots of ways

@17_hariprasath.j41 Год назад

@@alienwarex51i3 okie

@alvidediev97 Год назад

My dear ahi, please, dont forget about اَلسَّلَامُ عَلَيْكُمُ‏‎ 🤗❤

@monishwarmc1829 Год назад

15:10🤨🤔🥴😁

@hammer9185 Год назад

how can i change my inntellij build loading animation with different color. I saw that yours is like rainbow🌈.

@xiaotao9319 Год назад

plugin:nyan progress bar

@user-eh4ep7yc9w Год назад

It's a joke with switches? Why don't just use "->" syntax?

@amigoscode Год назад

Not everyone using latest version of Java

@V4dk4n Год назад

Many projects are java 8.

@alexisantonindioulo4225 Год назад

@@amigoscode yes i'am agree with this almost people dont know the last version of java, so in the demo he used the basic version to explain how to use Switch case correctly.

@filipstojiljkovic4711 Год назад

Amigo are you cold, whats with a cap on ?

@norte-code Год назад

I wish some RU-vidr to spring/Java like Phillip lackner on Android, cuz he teach something that is reaaaally problems, not this simples thinks

@salmanqudrat6741 Год назад

isnt arraylist heterogenous?

@alexisantonindioulo4225 Год назад

No, if you define a type all information in the ArrayList must be the same type

@cheikhtidianediouf5968 Год назад

where is the " assalamou allaykoum amigoscode " ?

@cheikhtidianediouf5968 Год назад

I finally heard it at the end of the first part ❤

@stalker200368 Год назад

I honestly dislike new ui. It became too minimalistic, less functional and comperhensive, now every button only has icon instead of icon + name, so you cant say what is what without clicking on it, the color is also more blue, so it hurts my eyes

@Mikenight120 Год назад

I really love the new UI, you can change the theme of the editor too just in case. I never clicked on things and usually have everything at the reach of keyboard shortcuts so its very nice to remove the clutter in my opinion.

@Ahmed-zeno Год назад

وعليكم السلام

@sorieran8695 Год назад

Number 1: Develop anything in Java

@frsh3083 Год назад

1. in the first example you don't even have to use any explicit loop, just use .filter(), it's thread-safe as well 2. doesn't really someone use generics? is it java 4 or what? 3. I second that, string pool and equality are literally the basics of that language, but still a lot of people doesn't understand it 4. intellij screams "if statement can be simplified", I'd rather give an piece of advice: "listen to your linter!" 5. the ternary's cool :) 6. when it comes to static fields, I'd rather pay attention to not allocate any particular amount of memory to them since they won't be garbage-collected 7. the proper use of switch statements are good, but the switch expressions are better :) 8. agree 9. generally I recommend to get familiar with the jcmd tool, you can check memory dumps thanks to it and many many more 10. optional is a good step forward, but vavr option is even better

@tofahub Год назад

This was helpful. I knew most of what he covered but your points are a step further. Did you find this in the "Effective Java" book?

@lordtrollalot8707 Год назад

1st mistake: started a Project in Java xP

@mayconfrr Год назад

Bro, if you’re having to explain to someone how .equals work, you probably shouldn’t be telling about string optimization on memory poll

@JatBadmos Год назад

👍👍

@infoelekblog9688 Год назад

I think the advice about using List instead ArrayList does not apply when working with local variables, by doing so you limit yourself to use only interface that List provide (without casting). Generally your device is good but the way you change the code is is a bad practice :|

@Jazzon234 Год назад

It depends on the implementation you are using. Speaking of List and ArrayList, there is no reason to use ArrayList because it doesn't really provide any additional functionality that you would need to use. If the specific implementation provides additional functionality, then yes you are right :)

@ilyatemnikov9624 Год назад

Judging by the cover, one gets the impression that Java is programmed by people with Down syndrome and cerebral palsy at the same time

@manilladrift Год назад

LMAO so true 😂😂

@CVenture Год назад

Switch to New UI pls. Classic UI sux.

@felipe1876 Год назад

is that ok to state in our portifolio that we used chat gpt to refactor the code?

@SanidhyaKumar-lf2pv Год назад

java or jewa

@EhteshamShahzad Год назад

8:17 I beg to differ. That's less readable, more cryptic. Especially for someone who is new to coding. I like your previous approach better, just remove the else condition.

@YounisLY Год назад

The topics you talk about are interesting and you never fail to make me click, but i can never finish your videos because you are way way too slow, you always lose me halfway through. Please speed it up a little more