Why do I get the "Unhandled exception type IOException"?

Question

I have the following simple code:

import java.io.*; class IO {     public static void main(String[] args) {            BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));            String userInput;            while ((userInput = stdIn.readLine()) != null) {           System.out.println(userInput);        }     } } 

And I get the following error message:

---------- 1. ERROR in io.java (at line 10)     while ((userInput = stdIn.readLine()) != null) {                         ^^^^^^^^^^^^^^^^ Unhandled exception type IOException ---------- 1 problem (1 error)roman@roman-laptop:~/work/java$ mcedit io.java  

Does anybody have any ideas why? I just tried to simplify the code given on the sum web site (here). Did I oversimplify?

Answer 1

You should add "throws IOException" to your main method:

public static void main(String[] args) throws IOException {

You can read a bit more about checked exceptions (which are specific to Java) in JLS.