Full-stack dev quiz question #56

Full-stack dev quiz question #56

Construtors in Java have limitations. Not everything is possible in them. Check fifty sixth question of full-stack dev quiz to check if you know what they are.

This is a code of one class in Java 11. It has a serious issue that prevents it from being usable. Actually, it will not even compile.

public class AppException extends Exception {
 
  public AppException(int errorCode, Throwable cause) {
     if (errorCode == 1) {
        super(buildMessage(errorCode));
     } else {
        super(buildMessage(errorCode), cause);
     }
  }
 
  private static String buildMessage(int errorCode) {
     switch (errorCode) {
        case 1:
           return "User not found";
        case 2:
           return "Malformed request";
        default:
           return "Unknown error";
     }
  }
 
}

What is the compilation-time problem with that class? Choose the best answer.

1. Exception class cannot be extended as it is final.
2. AppException constructor must have the same list of arguments as a construction from Exception class.
3. Calling the super constructor cannot be precedented by any other code.
4. A constructor cannot call a static method.
5. A switch statement cannot return String.

For the correct answer scroll down

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The correct answer is: c. If you would like to read more, check Logic in constructor or static factory method article.