Class Cast exception using ArrayList,toArray()

[Tony Evans]

Hi

I have the following code that is causing a Exception java.lang.ClassCastException.


String [] files = (String []) arrList.toArray();

Can anyone shed any light on this. Thanks for anyhelp.

Tony

[Scott Selikoff]

The method toArray() converts to the type Object[] and this cannot be cast down to String[].

You have to provide an argument to the method specifying the type such as toArray(new String[size]) where size can be specified as the same, smaller than or greater than depending on your needs

From the API:

array param - the array into which the elements of this list are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.

[Keith Lynn]

You need to use the other version of toArray that specifies the runtime type of the array returned.

(String[])arrList.toArray(new String[0]);

[Ernest Friedman-Hill]

We just discussed this one ad nauseum here.

[Scott Selikoff]

Originally posted by Ernest Friedman-Hill:
We just discussed this one ad nauseum

It's like groundhog day where every day you discuss the same topic over and over again...

[Tony Evans]

LOL thanks actually I solved the problem and this is my snippet of code :

String files [] = (String []) arrList.toArray (new String [arrList.size ()]);

Thanks again

Tony