Scope

public class Room {

. . .

private static int nextId = 1;

private int id;

static Room last;

private Room previous;

. . .

public Room() {

id = nextId;

nextId = nextId + 1;

previous = last;

last = this;

}

public static Room findRoom (int targetId){

Room r = last;

while (r != null && r.id != targetId)

r = r.previous;

return r;

}

}

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