CodeGym /Courses /Java Multithreading /Big task: Writing a chat application in Java

Big task: Writing a chat application in Java

Java Multithreading

Level 6 , Lesson 15

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"Hi, Amigo!"

"Hello, Captain Squirrels, sir!"

"We need an alternative communication channel in the event of a natural disaster."

"Is there something you're not telling me? What natural disaster?"

"Unlike civilians, we must always have a backup communication channel."

"Skype?"

"It's not very reliable, and we don't have control over their servers. We'll write a chat client with its own blackjack... I mean, with its own server and clients!"

"And will it have a graphical interface?"

"If you do exactly what Agent IntelliJ IDEA tells you to do, then there will be a graphical interface."

"Wow, finally! Can I ask another question?"

"Too many questions. As a bonus exercise, you can write a bot to answer your own questions. "Move out!"

"Yes, sir!"

Big task: Writing a chat application in Java - 1

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Comments (28)

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Untitled by Anon Level 49, Germany

11 June 2023

Ugh...part 16 took me forever. An advice: no matter how hard intelliJ is goading you, don't use try-catch. It will fail the IOException requirements.

Alex Buyanov Level 47, Netherlands

4 November 2022

In part 16, switch statement (which you normally use to check enum values) isn't allowed. You have to use if instead

Maksim Krasnov Level 47, Kyiv, Ukraine

27 September 2022

An interesting task showing the architecture of a real application, nice.

阿狼 Level 32, Zhengzhou, China

26 July 2022

d41

TomL Level 30, Prague, Czech Republic

25 February 2022

Hey, love this Big Task! Super useful, codeGym!! 👍

Ibrahim Level 24, Sheffield, United Kingdom

21 February 2022

For more info on client server architecture and socket server architecture: https://codegym.cc/groups/posts/288-part-2-lets-talk-a-bit-about-software-architecture https://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html

Lisa Level 41

26 September 2021

Solving this task was really nice. Client and server are well designed and there are some smart ideas behind it. Much of what has been learned so far is realized here, but the difficulty level is very demanding in parts if you compare it with the last big task. The introduction to Swing, however, is pathetic. And a pity is that you can not use a switch statement to solve part 16. Why? It's the killer feature of an enum that you can use it in switch.

Andrei Level 41

7 May 2021

Nice, I liked it! Although quite difficult and I don't fully understand how it works.

Baurzhan Konurbayev Level 40

5 April 2021

It's weird that in part 9: 1. In method notifyUsers, I really expected to send a name of new added user as message data, but instead it's required to send remote username that you notify. 2. Why is connection parameter needed in the method if I can get all connections from connectionMap field?

Baurzhan Konurbayev Level 40

5 April 2021

Actually, I figured that it's about sending to new User information about other Users, which took me a while to get.

MaGaby2280 Level 41, Guatemala City, Guatemala

25 November 2020

Took me a week, but I am proud to have completed it!!!