I don't understand what this task is asking for

Question about the task

We're all friends here, even the exceptions

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I think I have the inheritance correct (it says to base it off of Task 2). It's the part about 2 checked and 2 unchecked I'm not following. Lesson 4 said the difference was basically the use of "throws" to designate which ones are checked and which are unchecked. I have specified that it throws two of them (it doesn't say which ones have to be thrown). The other tasks in this lesson were easy (including the "Medium" one), but this one has me utterly lost. I think I'm just not understanding the question.

There are four classes: MyException, MyException2, MyException3, and MyException4.
Inherit the classes so that you get any two checked exceptions and any two unchecked exceptions.

Hint:
Carefully study the Exception1, Exception2, and Exception3 classes from the second task in this lesson.

Requirements:

The Solution class must have 4 nested classes: MyException, MyException2, MyException3, and MyException4.
All the nested classes must inherit exception classes.
Two of the four classes must be checked exceptions.
Two of the four classes must be unchecked exceptions.

package com.codegym.task.task09.task0918; /* We're all friends here, even the exceptions */ public class Solution { public static void main(String[] args) throws MyException, MyException2 { } static class MyException extends Exception { } static class MyException2 extends MyException { } static class MyException3 extends MyException2 { } static class MyException4 extends MyException3 { } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

21 July 2021, 21:08

solution

The task is asking you to make each of those class class extend 1 of any exception with the requirements saying at that the end result should be 2 checked exceptions and 2 unchecked exceptions. Checked exceptions will prompt the IDE you are using to show an error as you are typing a code until you write code to handle the possibility of the exception; while unchecked exceptions will not require this. See attached picture for example:

Here I just have 2 test methods, one throws a checked exception while the other throws an unchecked exception. When I call both methods in the main() method, one has an error because the method throws a checked exception and the IDE requires code to handle it. So. Figure out 2 checked exceptions and 2 unchecked exceptions (you can find lists that contain either very easily online) and then make the classes in this task each extend one.

Justin Smith

Level 41 , Greenfield, USA, United States

21 July 2021, 21:25

Oh! I thought when it was referring to them as "nested classes" that it meant they needed to extend each other in order like how Task 2 does (and it says to look at Task 2 for help, even!). I didn't realize it was just asking me to pick 2 Exception classes that are already defined as checked/unchecked. So yes, I was very confused about what I was being asked to do with this one. Fixed it up and it works now. Thanks a lot!

Guadalupe Gagnon

Level 37 , Tampa, United States

21 July 2021, 21:31

No worries, it took me a few moments to understand the conditions myself before I answered.