How to Resolve the \"Unhandled Exception Type IOException\" Error?

Understanding the "Unhandled Exception Type IOException" Error

In your code, you're trying to read input from the standard input stream using stdIn.readLine(). This method throws an IOException if an error occurs while reading data, such as unexpected end-of-file or corrupted data.

Java strongly discourages using try-catch blocks to handle checked exceptions like IOException. Instead, you should explicitly indicate that the method can throw an exception by declaring it in the method signature using the throws keyword.

Therefore, to resolve the error, you need to add throws IOException to your main method:

<code class="java">import java.io.*;

class IO {
    public static void main(String[] args) throws IOException {   
       BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));    
       String userInput;    
       while ((userInput = stdIn.readLine()) != null) {
          System.out.println(userInput);
       }
    }
}</code>

Adding throws IOException signals to the compiler that the method may throw an IOException and forces callers of the method to handle the exception. This is important because IOExceptions indicate serious errors that cannot be ignored.

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