Why error

Question

https://code.sololearn.com/cxqoD3xWuMaS/?ref=app

error: unreported exception IOException; must be caught or declared to be thrown
serverSocket = new ServerSocket(port);
^
storage/shared/Download/Jvdroid/PROJ/server.java:23: error: unreported exception IOException; must be caught or declared to be thrown
clientSocket = serverSocket.accept();
^
storage/shared/Download/Jvdroid/PROJ/server.java:24: error: unreported exception IOException; must be caught or declared to be thrown
out = new PrintWriter(clientSocket.getOutputStream(), true);
^
storage/shared/Download/Jvdroid/PROJ/server.java:25: error: unreported exception IOException; must be caught or declared to be thrown
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
^
storage/shared/Download/Jvdroi

Answer 1

Method will throw exception not class

Class can extend another class
Class can implement multiple interfaces

Exception must be handled inside try catch block

https://code.sololearn.com/cY5YVbQ2Qtgk/?ref=app