@Test public void testSubtrees() { String message = "Subtrees collection was incorrectly determined"; Collection<TreeNode<String>> mSubtreesLevel1 = new HashSet<>(3); mSubtreesLevel1.add(node1); mSubtreesLevel1.add(node2); mSubtreesLevel1.add(node9); assertEquals(message, mSubtreesLevel1, root.subtrees()); Collection<TreeNode<String>> mSubtreesLevel2 = new HashSet<>(3); mSubtreesLevel2.add(node3); mSubtreesLevel2.add(node7); mSubtreesLevel2.add(node8); assertEquals(message, mSubtreesLevel2, node2.subtrees()); Collection<TreeNode<String>> mSubtreesLevel3 = Collections.singleton(node6); assertEquals(message, mSubtreesLevel3, node5.subtrees()); assertEquals(message, Collections.emptySet(), node6.subtrees()); }
public abstract Collection<? extends TreeNode<T>> subtrees();
TreeNode implements Iterable<TreeNode<T>>, Serializable, Cloneable { public abstract Collection<? extends TreeNode<T>> subtrees(); }
TreeNode implements Iterable<TreeNode<T>>, Serializable, Cloneable { public abstract Collection<? extends TreeNode<T>> subtrees(); TreeNode(T data);  TreeNode(); }
TreeNode implements Iterable<TreeNode<T>>, Serializable, Cloneable { public abstract Collection<? extends TreeNode<T>> subtrees(); TreeNode(T data);  TreeNode(); abstract Collection<? extends TreeNode<T>> subtrees(); abstract boolean add(TreeNode<T> subtree); abstract boolean dropSubtree(TreeNode<T> subtree); abstract void clear(); abstract TreeNodeIterator iterator(); T data(); void setData(T data); boolean isRoot(); TreeNode<T> root(); TreeNode<T> parent(); boolean isLeaf(); @SuppressWarnings("unchecked") TreeNode<T> find(final T data); Collection<? extends TreeNode<T>> findAll(final T data); boolean hasSubtree(TreeNode<T> subtree); boolean contains(TreeNode<T> node); boolean containsAll(Collection<TreeNode<T>> nodes); boolean remove(TreeNode<T> node); boolean removeAll(Collection<TreeNode<T>> nodes); void traversePreOrder(TraversalAction<TreeNode<T>> action); void traversePostOrder(TraversalAction<TreeNode<T>> action); Collection<TreeNode<T>> preOrdered(); Collection<TreeNode<T>> postOrdered(); Collection<? extends TreeNode<T>> path(TreeNode<T> descendant); TreeNode<T> commonAncestor(TreeNode<T> node); boolean isSiblingOf(TreeNode<T> node); boolean isAncestorOf(TreeNode<T> node); boolean isDescendantOf(TreeNode<T> node); long size(); int height(); int level(); @SuppressWarnings("unchecked") @Override TreeNode<T> clone(); @SuppressWarnings("unchecked") @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString(); }
TreeNode implements Iterable<TreeNode<T>>, Serializable, Cloneable { public abstract Collection<? extends TreeNode<T>> subtrees(); TreeNode(T data);  TreeNode(); abstract Collection<? extends TreeNode<T>> subtrees(); abstract boolean add(TreeNode<T> subtree); abstract boolean dropSubtree(TreeNode<T> subtree); abstract void clear(); abstract TreeNodeIterator iterator(); T data(); void setData(T data); boolean isRoot(); TreeNode<T> root(); TreeNode<T> parent(); boolean isLeaf(); @SuppressWarnings("unchecked") TreeNode<T> find(final T data); Collection<? extends TreeNode<T>> findAll(final T data); boolean hasSubtree(TreeNode<T> subtree); boolean contains(TreeNode<T> node); boolean containsAll(Collection<TreeNode<T>> nodes); boolean remove(TreeNode<T> node); boolean removeAll(Collection<TreeNode<T>> nodes); void traversePreOrder(TraversalAction<TreeNode<T>> action); void traversePostOrder(TraversalAction<TreeNode<T>> action); Collection<TreeNode<T>> preOrdered(); Collection<TreeNode<T>> postOrdered(); Collection<? extends TreeNode<T>> path(TreeNode<T> descendant); TreeNode<T> commonAncestor(TreeNode<T> node); boolean isSiblingOf(TreeNode<T> node); boolean isAncestorOf(TreeNode<T> node); boolean isDescendantOf(TreeNode<T> node); long size(); int height(); int level(); @SuppressWarnings("unchecked") @Override TreeNode<T> clone(); @SuppressWarnings("unchecked") @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString();  }