Method find

chapter21/src/main/java/com/seaofnodes/simple/node/Node.java:718–718

Debugging utility to find a Node by index

(int nid)

     * Debugging utility to find a Node by index
     */
    public Node find(int nid) { return _find(nid, new BitSet()); }
    private Node _find(int nid, BitSet bs) {
        if( bs.get(_nid) ) return null; // Been there, done that
        bs.set(_nid);