Question

Say that methodA calls methodB, and methodB calls methodC. MethodC might throw a NumberFormatException. Can the program be written so that methodA handles the exception?

Answer 1

Yes, methodA can handle the NumberFormatException thrown by methodC by using a try-catch block that catches and handles the exception. The exception will propagate up the call stack if not caught in methodB, allowing methodA to handle it.

Step-by-step explanation:

Yes, methodA can be written to handle the NumberFormatException that might be thrown by methodC. When methodB calls methodC, any exception that methodC might throw will propagate up the call stack unless it is caught and handled in methodB. If it is not handled in methodB, it will continue to propagate up to methodA. By using a try-catch block in methodA, you can catch the NumberFormatException and handle it appropriately there.

To achieve this, methodA needs to include a try-catch block surrounding the call to methodB. This try-catch block would specifically catch the NumberFormatException and handle it, preventing the exception from crashing the program. Below is a simple code example:

public void methodA() {
try {
methodB();
} catch (NumberFormatException e) {
// Handle exception here
}
}
public void methodB() {
methodC();
}
public void methodC() throws NumberFormatException {
// Code that may throw NumberFormatException
}

This structure ensures that methodA is responsible for handling the exception thrown by methodC, thus maintaining cleaner error handling and potentially preventing duplicated code across methods if multiple exceptions need to be handled.