Return an iterable object that iterates over this node's children. The iterator does not support the optional operation {@link Iterator#remove()}.
To iterate over a node's children, one can write
Node n = ...; for (Node child : n.children()) { ...
isLeaf() returns true, or this node has a nonzero number of children.
@return The children of the node
@see #getChildrenAsList()
Enumeration.
null.
null)
Note: the returned array also contains the {@link #shell() shell} pseudo-node. @return array of children nodes, sorted by size [never null, may be empty]
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