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Search - "java virtual machine"
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Interview with a candidate. He calls himself "C++ expert" on his resume. I think: "oh, great, I love C++ too, we will have an interesting conversation!"
Me: let's start with an easy one, what is 'nullptr'?
Him: (...some undecipherable sequence of words that didn't make any sense...)
In my mind: mh, probably I didn't understand right. Let's try again with something simple and more generic
Me: can you tell me about memory management in C++?
Him: you create objects on the stack with the 'new' keyword and they get automatically released when no other object references them
In my mind: wtf is this guy talking about? Is he confusing C++ with Java? Does he really know C++? Let's make him write some code, just to be sure
Me: can you write a program that prints numbers from 1 to 10?
Ten minutes and twenty mistakes later...
Me: okay, so what is this <int> here in angle brackets? What is a template?
Him: no idea
Me: you wrote 'cout', why sometimes do I see 'std::cout' instead? What is 'std'?
Answer: no idea, never heard of 'std'
I think: on his resume he also said he is a Java expert. Let's see if he knows the difference between the two. He *must* have noticed that one is byte-compiled and the other one is compiled to native code! Otherwise, how does he run his code? He must answer this question correctly:
Me: what is the difference between Java and C++? One has a Virtual Machine, what about the other?
Him: Java has the Java Virtual Machine
Me: yes, and C++?
Him: I guess C++ has a virtual machine too. The C++ Virtual Machine
Me (exhausted): okay, I don't have any other questions, we will let you know
And this is the story of how I got scared of interviews29 -
Java is so fucking stupid. Literally nobody likes Java. Fucking stupid ass language and every app that uses it is laggy and stupid as fuck. Fuck you Oracle. This is why literally nobody uses your cloud platform. Stupid deprecated shit that nobody uses anymore.
Anyone that uses Java is forced to because the software ware literally made 949349 years ago. Java is just such a stupid language and so fucking laggy. NOBODY LIKES JAVA VIRTUAL MACHINE. WHAT A STUPID INVENTION. WHOEVER DID THAT NEEDS TO BE FIRED ASAP. Oracle is such a stupid company. Make something that people actually want to use, because obviously nobody wants to fucking use Java. Nasty ass laggy fucking language.
Fuck you29 -
Create this fucking account just to say: FUCK XAMARIN!
Mono is great on Linux, but Xamarin.Android is a GAY RETARD!
Fucking Xamarin.Android apps are retarded, wait for them 3 fucking seconds and a simple Hello World app doesn't start.
Retarded Xamarin.Forms make the whole pile of shit a lot worse using fucking abstractions and stuff. And the geniuses at Uno Platform does not make this shit any better.
Why don't those nerds at Xamarin make a way to compile all C# code to native JVM bytecode and provide all C# core libraries AS NATIVE JAVA LIBRARIES, RATHER THAN LOADING A NEW USELESS RETARDED VIRTUAL MACHINE ON THE JVM?
So that's it. Guess there's no way to write good Android apps using C#.10 -
I just finished writing an Integer Java Virtual Machine in C.
Being able to write an echo server in IJVM Assembly, connect to it through netcat and see it run on my machine is legitimately one of the most satisfying moments I've had so far in programming. -
I have been keeping this inside for long time and I need to rant it somewhere and hear your opinion.
So I'm working as a Team Lead Developer at a small company remotely based in Netherlands, I've been working there for about 8 years now and I am the only developer left, so the company basically consists of me and the owner of the company which is also the project manager.
As my role title says I am responsible for many things, I maintain multiple environments:
- Maintain Web Version of the App
- Maintain A Cordova app for Android, iOS and Windows
- Working with pure JavaScript (ES5..) and CSS
- Development and maintenance of Cordova Plugins for the project in Java/Swift
- Trying to keep things stable while trying very hard to transit ancient code to new standards
- Testing, Testing, Testing
- Keeping App Stable without a single Testing Unit (sadly yes..)
- Just pure JavaScript no framework apart from JQuery and Bootstrap for which I strongly insist to be removed and its being slowly done.
On the backend side I maintain:
- A Symfony project
- MySQL
- RabbitMQ
- AWS
- FCM
- Stripe/In-App Purchases
- Other things I can't disclose
I can't disclose the nature of the app but the app is quite rich in features and complex its limited to certain regions only but so far we have around 100K monthly users on all platforms, it involves too much work especially because I am the only developer there so when I am implementing some feature on one side I also have to think about the other side so I need to constantly switch between different languages and environments when working, not to mention I have to maintain a very old code and the Project Owner doesn't want to transit to some more modern technologies as that would be expensive.
The last raise I had was 3 years ago, and so far he hasn't invested in anything to improve my development process, as an example we have an iOS version of the app in Cordova which of course involves building , testing, working on both frontend and native side and etc., and I am working in a somewhat slow virtual machine of Monterey with just 16 GB of RAM which consumed days of my free time just to get it working and when I'm running it I need to close other apps, keep in mind I am working there for about 8 years.
The last time I needed to reconfigure my work computer and setup the virtual machine it costed me 4 days of small unpaid holiday I had taken for Christmas, just because he doesn't have the enough money to provide me with a decent MacBook laptop. I do get that its not a large company, but still I am the only developer there its not like he needs to keep paying 10 Developers.
Also:
- I don't get paid vacation
- I don't have paid holiday
- I don't have paid sick days
- My Monthly salary is 2000 euro GROSS (before taxes) which hourly translates to 12 Euro per hour
- I have to pay taxes by myself
- Working remotely has its own expenses: food, heating, electricity, internet and etc.
- There are few other technical stuff I am responsible of which I can't disclose in this post.
I don't know if I'm overacting and asking a lot, but summarizing everything the only expense he has regarding me is the 2000 euro he sends me on which of course he doesn't need to pay taxes as I'm doing that in my country.
Apart from that just in case I spend my free time in keeping myself updated with other tech which I would say I fairly experienced with like: Flutter/Dart, ES6, NodeJS, Express, GraphQL, MongoDB, WebSockets, ReactJS, React Native just to name few, some I know better than the other and still I feel like I don't get what I deserve.
What do you think, do I ask a lot or should I start searching for other job?23 -
.. so apparently you can run JavaScript on the Java Virtual Machine (with a little bit of help from a module).7
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Struggling with Linux driver bullshit today. Trying to update the graphics driver completely hosed the networking, second monitor (HDMI), and I assume a bunch of other stuff. I tried using the Additional Drivers utility and it nearly made my system non bootable. So on my second computer I had to look up how to unfuck my machine using the command line. Yet another classy set of bullshit from Gnome. The driver for all this was trying to fix some java programs that show wonky depending upon where the window is on my second display. After unfucking the machine I found that resetting all the display settings for both displays magically fixed the java program fuckery. How the fuck? Literally setting things like display resolution, default display, moving virtual displays around. This bullshit somehow fixed display problems with java apps.
So I decided there is a perfect OS out there somewhere, but it isn't iOS, it isn't Windows and it isn't Linux. I decided to make the Perfect OS, or P-OS for short. Gonna use P-OS as a fake OS in my games I make. lol15 -
I have just slept for a minimum of 5 hours. It is 7:47 PM atm.
Why?
We have had a damn stressful day today.
We have had a programming test, but it really was rather an exam.
Normally, you get 30 minutes for a test and 45 minutes for an exam.
In this "test" we have had to explain what 'extends' does and name a few advantages of why one should use it.
Check.
Read 3 separate texts and write the program code on paper. It was about 1 super class and 1 sub class with a test class in Java.
Check.
Task 3: Create the UML diagram of the code from above. *internally: From above? He probably means my code since there is no other code there. *Checks time*. I have about 3 minutes left. Fuck my life.*
Draws the boxes. Put the class names in each of them. A private attribute for the super class.
Teacher: Last minute!
Draw the arrow starting starting from the sub class to the super class.
Put my name on each written paper. And mentally done for the day. Couldn't finish the last task. Task 3.
During this "test", I heard the frustrations of my classmates. Seemed like everyone was pretty much pissed.
After a short discussion with the teacher who also happens to be the physics professor of a university nearby.
[If you are reading this, I hope that something bad happens to you]
The next course was about computer systems. Remember my recent rant about DNS, dhcp, ftp, web server and samba on ubuntu?
We have had the task to do the screenshots of the consoles where you proof that you have dhcp activated on win7 machine etc. Seemed ok to me. I would have been done in 10 minutes, if I would be doing this relaxed. Now the teacher tells us to change the domain names to <surnameOfEachStudent>.edu.
I was like: That's fine.
Create a new user for the samba server. Read and write directories. Change the config.
Me: That should be easy.
Create new DNS entries in the configs.
Change the IPv6 address area to 192.168.x.100-200/24 only for the dhcp server.
Change the web server's default page. Write your own text into it.
You will have 1 hour and 30 minutes of time for it.
Dumbo -ANGRY-CLIENT-: Aye. Let us first start screenshotting the default page. Oh, it says that we should access it with the domain name. I don't have that much time. Let us be creative and fake it, legally.
Changes the title element so that it looks like it has been accessed via domain name. Deletes the url and writes the domain name without pressing Enter. Screenshot. Done. Ok, let us move to the next target.
Dhcp: Change lease time. Change IP address area. Subnet mask. Router. DNS. Broadcast. Optional domain name. Save.
Switches to win7.
ipconfig /release
ipconfig /renew
Holy shit it does not work!
After changing the configs on ubuntu for a legit 30 minutes: Maybe I should change the ip of the ubuntu virtual machine itself. *me asking my old self: why did not you do that in the first place, ass hole?!*
Same previous commands on win7 console. Does not work. Hmmm...
Where could be the problem?
Check the IP of the ubuntu server once again. Fml. Ubuntu did not save when I clicked on the save button the first time I have changed it. Click on save button 10 times to make sure it really is saved now lol.
Same old procedure on win7.
Alright. Dhcp works. Screenshot.
Checks time. 40 minutes left.
DNS:It is your turn. Checks bind9 configs. sudo nano db.reverse.edu.
sudo nano db.<mysurname>.edu.
Alright. All set. It should work now.
Ping win7 from ubuntu and vice versa. Works. Ping domain name on windows 7 vm. Does not work.
Oh, I forgot to restart the bind9 server on ubuntu.
sudo service bind stop
" " " start
Check DNS server IP on win7. It looks fine.
It still doesn't work. Fuck it. I have only 20 minutes left. Samba. Let us do this!
10 minutes in. No result. I don't remember why. I already forgot why I have done for it. It was a very stressful day.
Let us try DNS again.
Oh shit. I forgot the resolver!
sudo nano /etc/resolv.conf
The previous edits are gone. Dumb me. It says it in the comments. Why did not I care about it. Fuck it.6 minutes left. Open a yt video real quick. Changes the config file. Saves it. Restarts DNS and dhcp. Closes the terminal and opens a new one. The changes do not affect them until you reopen them. That's why.
Change to win7.
Ping works. How about nsloopup.
Does not work.
Teacher: 2 minutes left!
Fuck it.
Saves the word document with the images in it. Export as pdf. Tries to access the directories of the school samba server. Does not work. It was not my fault tho. Our school server is in general very slow. It feels like they are not maintained and left alone like this in the dust from the 90s.
Friend gets the permission to put his document on a USB and give the USB to the teacher.
Sneaky me: Hey xyz, can you give me your USB real quick?
Him: sure.
Gets bombed with "do you want to format the USB?" pop-ups 10 times. Fml. Skips in a fast way.
Transfers the pdf. Plug it out. Give it back.
After this we have had to give a presentation in politics. I am done.6 -
I feel like writing or telling people about the time I jumped from Windows 7 Ultimate and jumping to Windows 10. (I'm not against 10, but I'm never updating after what had happened to me)
It all starts when none of my games will play due to a possible issue with my graphics card. I look up "3D source game bug" and not many results pop up. I go on Microsoft's Qna areas and ask this question but to my surprise nothing they say would make sense. "Clean the pins of your graphics card, make sure you verify the games on Steam". I verified the games and they checked out as perfectly fine. I don't have access to my graphics card because this is a laptop, sadly not a tower.
Two months pass and my computer is already showing signs of stress, like it didn't want to live in a sense. It was three times slower than when I was on Windows 7 and it was unallocating areas of my main hard drive where I could make virtual hard drives.
Instantly I start looking up Linux distros and find Linux Mint. 17.3 was the current version at the time. I downloaded it and burned it onto a DVD-rom and rebooted my computer. I loaded into the disc and to my surprise it seemed almost like Windows 7 apart from the Linux part. I grab my external hard drive and partition it to hold the Linux distro and leave it plugged in incase Windows 10 does actually fail.
On December 19, a few months after Windows 10 had released. I start my laptop to try and continue my studies in video game development. But to my surprise, Windows 10 had finally crashed permanently. The screen flickered blue and black, and an error box saying Loginui.exe failed to start. I look at it for a solid minute as my computer had just committed suicide in a sense.
I reboot thinking it would fix the error but it didn't. I couldn't log in anymore.
I force shutdown the laptop and turn it back on putting it into safe mode.
To my surprise loginui.exe works and I sign in. I look at my desktop, the space wallpaper I always admired, the sound files, screen shots I had saved.
I go into file explorer and grab everything out of my default hard drive Windows was installed on. Nothing but 400gb got left behind and that was mainly garbage prototypes I had made and Windows itself. I formatted my external hard drive and placed everything on it. Escaping Windows 10 with around 100GB of useful data I looked at the final shutdown button I would look at.
I click it and try to boot into normal Windows 10. But it doesn't work. It flickers and the error pops up once more.
I force it to shutdown and insert the previous Linux Mint disc I made and format the default hard drive through Linux. I was done. 10 gave me a lot of shit. Java wouldn't work, my games has a functional UI but no screen popped up except a black abyss and it wouldn't even let me try to update my graphics card, apparently my AMD Radeon 5450 was up to date at the AMD Radeon 5000's.
I installed Linux Mint and thinking the games would actually play I open steam and Launch Half-Life 2 to check if Linux would be nicer to me than Windows 10 had been.
To my surprise the game ran. The scene from Highway 17 popped on screen and the UI was fully functional. But it was playing at 10-15fps rather than the usual 60-70fps. Keep look at my drivers and see my graphics card isn't in use. I do some research and it turns out I have a Hybrid Laptop.
Intel HD Graphics and an AMD Radeon 5450 and it was using the Intel and not the AMD. Months of testing and attempts of getting the games to work at high frame rates pass and the Damn thing still functions at a low terrible fps. Finally I give up. I ask my mom for a Windows 7 disc and she says we can't afford it. A few months pass and I finally get a Windows 7 installation disc through money I've saved up. Proudly I put it into my optical disc drive and install it to my main hard drive deleting Linux completely. I announced to all my friends my computer was back in working order and I install everything I needed, Steam, Skype, Blender, and Unity as well as all my games. I test Half-Life 2 and it's running exceptionally smoothly, I test Minecraft at max settings and it's working beautifully. The computer was functioning properly once again and my life as a developer started as I modeled things and blender, learned beginners C# and learned a lot of Batch. Today the computer still runs at a great speed and I warn others of what happened to me after I installed Windows 10 to my machine if they are thinking of switching from 7 or 8 on an older machine.
Truly the damage to my data cannot be undone. But the memory of the maintenance, work, tests, all are a memory of how Windows 10 ruined me and every night before the one year anniversary of Windows 10's release, I took out the battery of my laptop and unplugged it from the a.c. power, just so Windows 10 doesn't show it's DLLs, batch scripts, vbs scripts, anything on my computer. But now, after this has happened and I have recovered, I now only have a story to tell5 -
Tried this today:
Xubuntu running Ubuntu on a Virtualbox machine running Android emulator (ie. running Java virtual machine(s))
Failed miserably and even if it would have worked, I think the performance would have been horrible.1 -
A beginner in learning java. I was beating around the bushes on internet from past a decade . As per my understanding upto now. Let us suppose a bottle of water. Here the bottle may be considered as CLASS and water in it be objects(atoms), obejcts may be of same kind and other may differ in some properties. Other way of understanding would be human being is CLASS and MALE Female be objects of Class Human Being. Here again in this Scenario objects may differ in properties such as gender, age, body parts. Zoo might be a class and animals(object), elephants(objects), tigers(objects) and others too, Above human contents too can be added for properties such as in in Zoo class male, female, body parts, age, eating habits, crawlers, four legged, two legged, flying, water animals, mammals, herbivores, Carnivores.. Whatever.. This is upto my understanding. If any corrections always welcome. Will be happy if my answer modified, comment below.
And for basic level.
Learn from input, output devices
Then memory wise cache(quick access), RAM(runtime access temporary memory), Hard disk (permanent memory) all will be in CPU machine. Suppose to express above memory clearly as per my knowledge now am writing this answer with mobile net on. If a suddenly switch off my phone during this time and switch on.Cache runs for instant access of navigation,network etc.RAM-temporary My quora answer will be lost as it was storing in RAM before switch off . But my quora app, my gallery and others will be on permanent internal storage(in PC hard disks generally) won't be affected. This all happens in CPU right. Okay now one question, who manages all these commands, input, outputs. That's Software may be Windows, Mac ios, Android for mobiles. These are all the managers for computer componential setup for different OS's.
Java is high level language, where as computers understand only binary or low level language or binary code such as 0’s and 1’s. It understand only 00101,1110000101,0010,1100(let these be ABCD in binary). For numbers code in 0 and 1’s, small case will be in 0 and 1s and other symbols too. These will be coverted in byte code by JVM java virtual machine. The program we write will be given to JVM it acts as interpreter. But not in C'.
Let us C…
Do comment. Thank you6 -
C- let's See
C is a procedurally developed language follows sequential method of solving a problem.
Example
If a teacher of an Institute teaching various subjects, Maths, English, Science and History.
Case1.One student comes and asks teacher to teach English
and next student to teach Maths,
And the other to teach History.
Case2.Next students comes for English
Case3.Other one for History.
So what I understood regarding C is procedural language is
It completes first case1,next case2, and then case3. (Task after task)
Here English is taught 2 times seperate
And History too 2 times separately making time and process complexity.
C is a platform based high level language support only desired platform. If I program in windows with i3 processor , it runs only on the same OS and Processor, if code is run in other computers.
Single threaded, if a code is interrupted in between, stops there and doesn't allow other part of the code to run.
Java
In this if the same above cases encountered then and tell
Computer to create a Class of English and tell all the students to attend the class(time saving, No complexity and not repetitive)
Same way Creating History class and make all students attend the class at once.
Students may be the objects created.
Multi threaded language, if a task is interrupted following code cannot be stopped. Allows other part of thecode to run.
JVM- Java virtual machine allows Java code into signs that can be understood by computer. Where as C converts into binary code.
A class concept added to C language become C++rant support rant learning to code want to code jvm newbie asking high level languages are cool discussions java c mistakes3