int		index; int		size;
int index = parent.getIndex(this) + 1;
	public DefaultMutableTreeNode getNextSibling() {		// Variables		int		index;		int		size;		// Check for Parent		if (parent == null) {			return null;		} // if		// Get Index of this node		index = parent.getIndex(this);		// Check for Next Sibling		size = parent.getChildCount();		index++;		if (index == size) {			return null;		} // if		return (DefaultMutableTreeNode) parent.getChildAt(index);	} // getNextSibling()