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Clarify what is asked for in java Exceptions assignment

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By User



It does not appear evident to me what is asked in a java assignment I have received. Does anyone understand what is needed:







In the previous assignment, you implemented a stack and a list that both inherited from the abstract class ArrayIntCollection. In this task you are supposed to extend that implementation by make it throw exceptions if you try to perform operations that are not allowed (for example, if you try to call pop or peek on an empty stack or if you try to remove an element from a non existing position). You shall create and use the exception class CollectionException, of the type UncheckedException. Also write a test program ExceptionMain.java that generates and catches exceptions from your modified methods.







The way I understand it, I need to create a exception class called CollectionException , and it needs to extend UncheckedException . (this itself is not working, as I cannot find a class called UncheckedException ).





Also, it is obvious if I am to use try-catch or throws for this?





thanks to all!


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Comments

  1. Tips For AllFebruary 21, 2012 at 2:19 PM

    ...by make it throw exceptions...


    will mean, yes, you have to use throw.


    Also write a test program ExceptionMain.java that generates and catches exceptions from your modified methods.


    At least here you will have to use try...catch.

    Regarding "UncheckedException": Either there is a class of this name (perhaps in another package). Then you can ask your teacher where it is. Otherwise you can extend from java.lang.RuntimeException (which is an unchecked exception) and ask you teacher if that's OK.

    ReplyDelete
  2. Tips For AllFebruary 21, 2012 at 2:19 PM

    Create a class called CustomException which extends exception like below

    public class CustomException extends Exception {

    public NestableException() {
    super();
    }

    public NestableException(String msg) {
    super(msg);
    }

    public NestableException(String msg, Throwable cause) {
    super(msg, cause);
    }

    public NestableException(Throwable cause) {
    super(cause);
    }
    }


    Create a class that in which you override the methods that I believe were asked to create previously which would throw the CustomException with or without message. Create a main class which calls those methods and this will obviously have try catch block as you have thrown exception. Just in catch block do a debug or SOP with e.getMessage()

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