Question

I have defined my own expection class:

public class ProduktException extends Exception {

    public ProduktException(String msg){
    //null
    }

    public static void throwProduktNotCreatedException() throws ProduktException {
        throw new ProduktException("Cannot be created!");
    }

    public static void throwProduktNotDeletedException () throws ProduktException {
        throw new ProduktException("Cannot be deleted!");
    }
}

My Problem is I do not know how to throw them when I try:

try {
...
} catch(ProduktNotDeletedException e) {
    e.toString();
}

That does not work… But I want to have these structure! What is wrong?

I appreaciate your answer!!!

UPDATE:

My Problem is, I do not want to create several Exception Klasses I want to have all Exceptions in one class. Is there possibly a solution for that?

Answer 1

If you need to differentiate between different kinds of exceptions, just create 2 different exceptions, maybe something like:

public class ProduktException extends Exception
{
    public ProduktException(String msg){
    //null
    }
}

Then have:

public class ProduktNotDeletedException extends ProduktException
{
    ....
}

and

public class ProduktNotCreatedException extends ProduktException
{
    ....
}

Then you can catch one or the other, or both.

try {
    ...
} catch(ProduktNotDeletedException e1) {
    e1.toString();
} catch(ProduktNotCreatedException e2) {
    e2.toString();
} 

---

EDIT:

For a single class what I mean is:

public class ProduktException extends Exception {

    boolean notDeleted;
    boolean notCreated;

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

    public boolean isNotDeleted() {
        return(notDeleted);
    }

    public boolean isNotCreated() {
        return(notCreated);
    }

    public static void throwProduktNotCreatedException() throws ProduktException {
        ProduktException e = new ProduktException("Cannot be created!");
        e.notCreated = true;
        throw e;
    }

    public static void throwProduktNotDeletedException () throws ProduktException {
        ProduktException e = new ProduktException("Cannot be deleted!");
        e.notDeleted = true;
        throw e;
    }
}

Then in your try/catch:

try {
    ...
} catch(ProduktException e) {
    e.toString();
    if(e.isNotCreated()) {
        // do something
    }
    if(e.isNotDeleted()) {
        // do something
    }
}