Question

I have the following line of code in my project:

Iterator<Node> i = graph.nodes();

graph.nodes() is a method defined in prefuse.

Now I want to add a type check to the iterator, but how can I do that?

Answer 1

If you use Guava, you could do

Iterator<Node> iterator = Iterators.filter(theOriginalIterator, Node.class);

The returned iterator is guaranteed to continue only elements that correspond to the supplied type. ( A similar method is also available for Iterable btw )

See

• Iterators.filter(iterator, class)
• Iterables.filter(iterable, class)