Class Definition, revisited

/* Collection of rooms. */

import java.io.*;

public class Room {

// Each room r has a unique r.id > 0.

// nextId is the ID# of the next room

// to be created.

private static int nextId = 1;

private int id;

// For each room r, r.previous is the

// room created immediately before

// r was created, or null if r was the

// first room created. The most recent

// room to have been created is last.

private static Room last;

private Room previous;

. . .

}

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