String[] array = notSortedVector.toArray(); This is not working!!!

[Guy1983]

Hi,

String[] array = notSortedVector.toArray();

I get an incompatible types compilation error for this line of code. Does anyone have any clue why??

Any help would be greatly appreciated.

Thank you very much

Guy

 

[sedj]

You don't say what type "notSortedVector" is ... but I am guessing it is a Vector. If you read the documentation for Vector (

http://java.sun.com/j2se/1.4.2/docs/api/java/util/Vector.html

), you would see that the toArray() method returns a Object[], not a String[].

Of course, the compiler debug would also have told you this :

found   : java.lang.Object[]
required: java.lang.String[]

So you should either use :

Object[] arr = vector.toArray();

or cast :

String[] arr = (String[])vector.toArray();

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[Guy1983]

Hi Sedj,

I tried
String[] arr = (String[])vector.toArray();

I got a runtime error pointing to that line saying:

Exception in thread "main" java.lang.ClassCastException

I do know that the object[] = .... would work but I don't want to have to do that. The goal of my method is to sort a vector of strings alphabetically. I am passing the method a vector. I then want to convert it to an array. Use the arrays built-in sort algorithms to sort the array and then put the items back into a vector in sorted order and return it.

Thank you

 

[Diancecht]

First of all, check that the elements stored in the Vector are Strings (imaging that vector is a java.util.Vector).

If so, do this

String[] runtimeType = new String[]{};
String[] array = vector.toArray(runtimeType);

Cheers,

Dian

 

[idarke]

I believe you can just sort the Vector itself. Try this:

Collections.sort(vector);

It will sort the Strings in ascending alphabetical order.