Constructor Room, revisited

import java.io.*;

public class Room {

. . .

// 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;

// Create a new room with a unique ID# linked

// to the previous room created.

public Room() {

id = nextId;

nextId = nextId + 1;

previous = last;

last = this;

}

}

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