Java: use Enumeration multiple times

Question

I work with DefaultMutableTreeNode, and it has methods depthFirstEnumeration(), breadthFirstEnumeration() and children()

Answer 1

No that is not possible with Enumeration. On this subject, java doc says:

An object that implements the Enumeration interface generates a series of elements, one at a time.

Notice the one at a time which means that if you want to manipulate the Enumeration as a list then you will have to convert it. You can create a List when you first request the Enumeration. This way you could use and manipulate it however you wish.

Enumeration e = ...
ArrayList aList = Collections.list(e);