Thank you for taking time to explain each step in simple terms. I tried this on my own and was hung up on how each CH object could share 1 updated array list, but then you pointed out the beauty of static variables!
Remember to use 'Thread-Safe" collections or manage synchronization in this example.Our static arraylist is a shared resource, and can be accessed by multiple threads simultaneously, where each one can add, remove or read.
Perfeito bom demais essa aula, ficou muito bom mesmo . Sem enrolação e sem complicação foi ótimo esse tutorial, valeu deixo o meu like e minha inscrição, obrigado
Isn't it safer to convert public classes to private classes if they are not used in another class? or there is a reason for it? Thank you for this incredible work, your explanations are amazing !😍
In the broadcastMessage method, why compare usernames when you can just do: if (clientHandler != this) since clientHandlers is just an array of the clientHandler instances. Also doing it this way allows there to be multiple users with the same username since it does not rely on unique usernames to broadcast correctly, but instead on the instances. (I have not tested it yet, but it should work, if it doesn't then I will update this comment) Edit: I said I would only update if it didn't work, but it worked and I thought I would update it anyways. TL;DR it works, and its probably the better way to do it.
Nice video it was a really nice watch and i learned a bunch of new things from it! Can anyone please explain how to run it in CMD tho? (it looked cool)
Great cover of sockets in general. Just wanted to mention that I got an error in the ClientHandler whenever the Client exited. For some reason, the exception was not thrown and the bufferedReader read a "null" value from the input. I added this line and it worked: if(messageFromClient == null) throw new IOException(); By the way, if we wanted to create a network without the use of an intermediary server, so basically client-to-client direct communication. Any tips on how you could go about doing that? Thank you sir!
I met that problem, too. The things that if I applied your code, the server won't notify that the client who exited is leaving the chat. Is there another way to do that
@@ngocminhpham1358 You should add the code that you want to execute in the catch: try { messageFromClient = bufferedReader.readLine(); if(messageFromClient == null) throw new IOException(); broadcastMessage(messageFromClient); } catch(IOException e) { closeEverything(socket, bufferedReader, bufferedWriter); break; } Inside closeEverything, there should be a method called "removeClientHandler();" (this is in the video). If this method is executed then the server should be notifying everyone that the client has left the chat. Double check that you added this catch cluase as well as your "closeEverything" method.
hello i have a question, what should i do to make them connect from different pcs and not on localhost. i tried some solutions but it always give me an error
Hey good to hear from you again! That is correct! And actually probably a better idea as I did not check for duplicate usernames provided by clients! 😄
This is very impressive and it works. I like your approach with clientHandlers. Im a little confused about how multiple clients can connect using the same port. When I did a similar project in C# i got an error saying something like "this port is already in use". Can anyone explain that to me?
hi, how did you end one client using the command line? At time 2:01. I tried it using Ctrl+C in mac and the server generated a NullPointerException as soon as that client terminated using Ctrl+C
how come the same socket in client that sends a message doesn't receive one? I know that we look in arrayList and avoid that but it should work based on the code from the client.java
Runnable passed to Thread in listenForMessage() could be implemented by lambda new Thread( () -> {/*code*/}); because Runnable interface has only 1 abstract method, thus making it functional interface.
I just wanted to say I love your content and how you interact with your fan base but I was also wondering how to run this program from command prompt and how to configure this for use over WAN networks. PS: this tutorial inspired me to make my own chat room project which has been my first real (successful) program.
Hey John thanks so much for the feedback! To run it over the command prompt you just have to go to where you made the java files and compile it like javac .java and then run it like java . And I have gotten a few questions about making these Java networking programs accessible over the internet and to be honest I am not entirely sure how to do it besides port forwarding or giving your server a public address. Im probably gonna take some time to look into this and make a video on it! 😀
Extremely thankful for helping us in the easiest ways but, if i want to store every one of the texts sent in a file that stays in the "Server" and whenever a new client joins he/she gets all of the messages printed from the file in the console .. to do that what are the changes i should do?
Great video, loved it. Thank you for explaining the details. Is it possible to implement this structure of group chat with graphical user interface? Actually I tried but I couldn't figure it out. It simply didn't work
is there any difference if we use other io classes such as printwriter, datagramoutput, bufferedoutputstream? I got confused sometimes when I work with other io classes for Java Socket, it doesn't work. The io classes don't input nor output the given string.
Hey wittcode, I hope you see this, I loved the tutorial, and you explained everything very well with a hands on approach, but is it possible to run the clients on different computers? If so, how?
i gotchu just run a client-like file on a different computer and use the ip address of your server computer instead of "localhost", also make sure they're on the same network
Tried to adapt this to my game, but only managed to get the server to register the connections, but the clients didnt seem to receive anything. Dunno if the issue was caused by the gui or what.
Hi. Thank you for your work. I have some questions. what if i want to send a private message. I will need to creat a new thread for chating with only this client?
I think this is the best video on RUclips about I/O streams and sockets.
Is there any way I can see your code
This dude literally explained my entire 5 months course in a 40 minute video
Thank you for taking time to explain each step in simple terms. I tried this on my own and was hung up on how each CH object could share 1 updated array list, but then you pointed out the beauty of static variables!
Thanks so much man! Also love your taste in music haha 🎸
@@WittCode hell ya Java and Punk Rock are a 90s dynamic duo🤘
@@WittCode can i make those names of clients in diferent color ?
@@og_yamiatan3957 I mean it's in the cmd prompt so prob not, but if you make a GUI for it you could find a way
This truly explains everything so clear, thanks man
Haven't even finished the video yet but I'm happy I found this channel!
This is so exciting!!! I had been trying other tutorials, even paid ones and had problems with all the others. On this one everything went perfect.
IT WORKED, THANKS I'VE BEEN LOOKING FOR THIS FOREVER, BUT NO TUTORIAL COULD EXPLAIN IT AS YOU DID
Remember to use 'Thread-Safe" collections or manage synchronization in this example.Our static arraylist is a shared resource, and can be accessed by multiple threads simultaneously, where each one can add, remove or read.
Let me just tell you one thing. Thanks for Being in RUclips to share content most are not capable of doing.
Thanks so much!
Wow man, you really clearly showed how to make such chat in Java, thanks a lot! :)
Thank you so much for this video! Very well explained, it helped me a lot for my university project.
THIS IS SO COOL! And I managed to reinforce sockets, IO, AND threads ALL AT ONCE
Thx for your tutorial, I finally understand how socket work
So underrated!!! I wish you'll gain more subscribers and viewers. Amazing video
I understand all men you're a great teacher!!
Thank you so much dude! Consider becoming a teacher in the future 🙏 You have that pedagogical talent :)
You explain everything so well and simple ♡
Great work! I love the thumbnail! So many WittCodes!
Thanks for the support Freddie! 😎
Lowkey saved my uni lab work xd , keep up the good work !!
Thank you, I had trubles with sending message to multiple clients, because of reading system input, thanks again!
Hey there thanks so much! Yeah the reading input part tripped me up for a while too! 😃
Wow you are suck a great teacher. You explain every step. Thank you so much!
This is what, I looked for in Java. Thank you so.
Thank you for the clear and concise explanation. I just subscribed you. I wish to watch your more videos.
😀
great video thanks for making it i was stuck on this for so long
great video, wonderful explanations throughout too.
😀
You are a lifesaver man, thank you a lot you are saving me a ton of hours and nerves :)
thank you so much, this content deserves much more credit
Thanks so much! That means a lot! 😃
Great video all the best
Thank you! Learned a lot from this
Greetings from Ukraine! You are awesome! Thank you so much for this great tutorial. It helped me a lot.
Your content is amazing brother, keep it up! I would love to see this video with a GUI integration as you said in the end of the video.
Thanks so much Kevin! And I will certainly be making a GUI version of this! Probably using JavaFX 😀
@@WittCode , hey witt please do that asap
I'm so grateful to you, this really so helpful man thank you so much
I took a server side approach instead of a client side approach, love the video tho, thank you
Nice one man. Keep it up!
Perfeito bom demais essa aula, ficou muito bom mesmo . Sem enrolação e sem complicação foi ótimo esse tutorial, valeu deixo o meu like e minha inscrição, obrigado
Hello sir. Is the code still on your website? i can only seem to see some Javascript. Is it on a github page?
Thank you so much!!! This is what I was finding!
your video is awesome and helped me a lot. thank you.
Very helpful! Thank you so much!
this is briliant my friends thank you so much
This is simply awesome man 👍❤️
You are lifesaver man, thank you a lot :)
video is very helpful. Thank you.
thanks a lot bro, keep the good job.✌
Great content, learned a lot!
Is there anyway I can see your code by chance, that is if it's working
thank you so much, saved my homework truly!
bro can you send code please
Thank you very much for this!
Thanks bro it has been very usefull for me
Why we can't run the server again? After it being in use? Like turn off the server and Re-open it.
Great tutorial!
Thank you man, is that possible to chat only with one person from the group please share if you have such kind of code
this was perfect for me thank you
nice tutuorial man and one silly question "can I connect to that server from another PC?" Or it works only local host?
Can you share the code, not able to find in the link you kept in description
Is it a TCP or UDP based communication? Really good Video
Isn't it safer to convert public classes to private classes if they are not used in another class? or there is a reason for it?
Thank you for this incredible work, your explanations are amazing !😍
i tried it it works but my message dont appear to other clients it only appears in my chat only not other chats'
In the broadcastMessage method, why compare usernames when you can just do: if (clientHandler != this)
since clientHandlers is just an array of the clientHandler instances. Also doing it this way allows there to be multiple users with the same username since it does not rely on unique usernames to broadcast correctly, but instead on the instances. (I have not tested it yet, but it should work, if it doesn't then I will update this comment)
Edit: I said I would only update if it didn't work, but it worked and I thought I would update it anyways. TL;DR it works, and its probably the better way to do it.
yah it sounds correct
Nice video it was a really nice watch and i learned a bunch of new things from it! Can anyone please explain how to run it in CMD tho? (it looked cool)
Great video! Really helped!
Great cover of sockets in general. Just wanted to mention that I got an error in the ClientHandler whenever the Client exited. For some reason, the exception was not thrown and the bufferedReader read a "null" value from the input. I added this line and it worked:
if(messageFromClient == null) throw new IOException();
By the way, if we wanted to create a network without the use of an intermediary server, so basically client-to-client direct communication. Any tips on how you could go about doing that?
Thank you sir!
I met that problem, too. The things that if I applied your code, the server won't notify that the client who exited is leaving the chat. Is there another way to do that
@@ngocminhpham1358 You should add the code that you want to execute in the catch:
try {
messageFromClient = bufferedReader.readLine();
if(messageFromClient == null) throw new IOException();
broadcastMessage(messageFromClient);
} catch(IOException e) {
closeEverything(socket, bufferedReader, bufferedWriter);
break;
}
Inside closeEverything, there should be a method called "removeClientHandler();" (this is in the video). If this method is executed then the server should be notifying everyone that the client has left the chat. Double check that you added this catch cluase as well as your "closeEverything" method.
@@fabiansvensson9588 thanks a lot!
@@fabiansvensson9588 Oh my god i was desperate while seaching the solution and boom i found your comment. You're a god.
at which line do you add this "if(messageFromClient == null) throw new IOException();" ?
hello i have a question, what should i do to make them connect from different pcs and not on localhost. i tried some solutions but it always give me an error
thank you! Subscribed!
Nice tutorial man, rly need something like tihs :D
Thanks so much! Also, love your username lol
This helped me a lot, thanks!
Thank you very much!
tysm for this video! its great! one question tho.. at 21:14
couldn't you check if this!=clientHandler?
Hey good to hear from you again! That is correct! And actually probably a better idea as I did not check for duplicate usernames provided by clients! 😄
@@WittCode yeah i was wondering abt duplicate usernames lol
Thank you very much, man
This is very impressive and it works. I like your approach with clientHandlers. Im a little confused about how multiple clients can connect using the same port.
When I did a similar project in C# i got an error saying something like "this port is already in use". Can anyone explain that to me?
Love the thumbnail hahah
Sahil! Good to hear from you man! And yeah I thought it was the coolest one Ive made so far lol
beautiful! thanks! (do more java tutorials pls
Which design patterns are we using in this program and which pattern I can implement into the code in addition to develop the code?
the client message is not sent to all clients !!
Real gem!!
Many thanks Sir 😘
hi, how did you end one client using the command line? At time 2:01. I tried it using Ctrl+C in mac and the server generated a NullPointerException as soon as that client terminated using Ctrl+C
how come the same socket in client that sends a message doesn't receive one? I know that we look in arrayList and avoid that but it should work based on the code from the client.java
Runnable passed to Thread in listenForMessage() could be implemented by lambda
new Thread( () -> {/*code*/});
because Runnable interface has only 1 abstract method, thus making it functional interface.
Thank you for good educating content. on 21:46, could we use if(this!=clientHandler) {}?
very helpful video !
thank uuuuu so much, this is so helpful
Shouldn't we rather use AtomicReferenceArray for the clientHandlers to avoid race conditions since more thread access it?
You are correct, use thread-safe collections or manage synchronization
can the client use anathor computer
like LAN
???
I just wanted to say I love your content and how you interact with your fan base but I was also wondering how to run this program from command prompt and how to configure this for use over WAN networks.
PS: this tutorial inspired me to make my own chat room project which has been my first real (successful) program.
Hey John thanks so much for the feedback! To run it over the command prompt you just have to go to where you made the java files and compile it like javac .java and then run it like java . And I have gotten a few questions about making these Java networking programs accessible over the internet and to be honest I am not entirely sure how to do it besides port forwarding or giving your server a public address. Im probably gonna take some time to look into this and make a video on it! 😀
@@WittCode Thank you so much, I really appreciate you taking the time out of your day to respond to my request!
Great tutorial, thanks
I got error at client.java public static void Socket socket= new Socket ("localhost",1234);
I didn't getting host: and port: in above how to fix it
Helpful video thanks for making this. Can you do a server PC and a client mobile phone.
Great video!
awesome video i love it thankyouu
Extremely thankful for helping us in the easiest ways but, if i want to store every one of the texts sent in a file that stays in the "Server" and whenever a new client joins he/she gets all of the messages printed from the file in the console .. to do that what are the changes i should do?
mine is refusing to connect to the server and when i check on my code everything is oky
i don't if is it safer to change the port number or what?
can someone explain how to run this in CMD like he did in the beginning please?
Thanks! Can you help me? I can start the client, but the server are closing in few seconds
I have tried to allow multiple instances of my ChatClient class but it isn't working. Can you please help me with this! Thank you!
Great video, loved it. Thank you for explaining the details. Is it possible to implement this structure of group chat with graphical user interface? Actually I tried but I couldn't figure it out. It simply didn't work
great channel
is there any difference if we use other io classes such as printwriter, datagramoutput, bufferedoutputstream? I got confused sometimes when I work with other io classes for Java Socket, it doesn't work. The io classes don't input nor output the given string.
Hey wittcode, I hope you see this, I loved the tutorial, and you explained everything very well with a hands on approach, but is it possible to run the clients on different computers? If so, how?
i gotchu just run a client-like file on a different computer and use the ip address of your server computer instead of "localhost", also make sure they're on the same network
@@Rohan-Prabhala tysm, so i run the client script and not the client handler right?
@@dabexter client handler works on the server side so that other clients can parallelly work without any error.
@@arunvasunny7386 thank you
@@dabexter have you completed your project?
Tried to adapt this to my game, but only managed to get the server to register the connections, but the clients didnt seem to receive anything. Dunno if the issue was caused by the gui or what.
Hi. Thank you for your work. I have some questions. what if i want to send a private message. I will need to creat a new thread for chating with only this client?