Classes which implement this interface provide methods
that deal with the expanding and collapsing of tree
branches.
<p>
After creating an instance of a class that :
this interface it can be added to a tree control using the
<code>addTreeListener</code> method and removed using
the <code>removeTreeListener</code> method. When a branch
of the tree is expanded or collapsed, the appropriate method
will be invoked.
</p>
Classes which implement this interface provide methods that deal with the expanding and collapsing of tree branches. <p> After creating an instance of a class that : this interface it can be added to a tree control using the <code>addTreeListener</code> method and removed using the <code>removeTreeListener</code> method. When a branch of the tree is expanded or collapsed, the appropriate method will be invoked. </p>
@see TreeAdapter @see TreeEvent