Method joinTo

java/Chapter 16/Question16_4/LockNode.java:25–27

(LockNode node)

	
	/* Join "this" to "node", checking to make sure that it doesn't create a cycle */
	public void joinTo(LockNode node) {
		children.add(node);
	}
	
	public void remove(LockNode node) {
		children.remove(node);