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I am trying to make this code from here https://www.geeksforgeeks.org/multi-threaded-chat-application-set-1/ run but it keeps saying 

Exception in thread "Thread-1" java.util.NoSuchElementException
	at java.base/java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
	at multithreadchatserver.ClientHandler.run(ClientHandler.java:55)
	at java.base/java.lang.Thread.run(Thread.java:830)

I ran the debugger and it says it can't find mc in the code for the for loop here in the class ClientHandler

				for (ClientHandler mc : Server.ar) { 
					// if the recipient is found, write on its output stream 
					if (mc.name.equals(recipient) && mc.isloggedin == true)
					{ 
						mc.dos.writeUTF(this.name +" : "+ MsgToSend); 
						break; 
					} 
				}

 

I tried declaring it before anything in the constructor but then it says mc is never used. I think it has to do with it creating an instance of the class that it is in. mc is a ClientHandler but it's in the ClientHandler class

 

Any ideas?

ƆԀ S₱▓Ɇ▓cs: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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