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+import java.util.*;%0A%0Apublic class Maze%0A%7B%0A    public static final String WALL = %22#%22;%0A    public static final String UNEXPLORED = %22 %22;%0A    public static final String DROID = %22.%22;%0A%0A    public Maze ()%0A    %7B%0A        _map = new Vector%3CCoordinate%3E();%0A    %7D%0A%0A    private Vector%3CCoordinate%3E _map;%0A%7D

Create Maze.java