以下は、Javaによるアルゴリズムの実装例である：

```java
import java.util.*;

public class DungeonMapGenerator {

    private int dungeonWidth;
    private int dungeonHeight;
    private int maxAttempts;
    private List<Room> rooms;
    private List<Wall> walls;
    private Random rand;

    public DungeonMapGenerator(int width, int height, int attempts) {
        dungeonWidth = width;
        dungeonHeight = height;
        maxAttempts = attempts;
        rooms = new ArrayList<>();
        walls = new ArrayList<>();
        rand = new Random();
    }

    public void generate() {
        // create first room
        Room firstRoom = new Room(0, 0, rand.nextInt(dungeonWidth/2) + 3, rand.nextInt(dungeonHeight/2) + 3);
        rooms.add(firstRoom);
        
        // add walls to wall list
        walls.addAll(firstRoom.getWalls());

        // add additional rooms
        int attempts = 0;
        while (attempts < maxAttempts && !walls.isEmpty()) {
            // select random wall and room to add
            int wallIndex = rand.nextInt(walls.size());
            Wall selectedWall = walls.get(wallIndex);
            Room selectedRoom = new Room(selectedWall);

            // attempt to move room if overlapping with existing rooms
            boolean overlap = false;
            for (Room r : rooms) {
                if (selectedRoom.intersects(r)) {
                    overlap = true;
                    for (int i = 0; i < 4; i++) {
                        selectedRoom.move(i);
                        if (!selectedRoom.intersects(r)) {
                            break;
                        }
                    }
                    if (overlap) {
                        break;
                    }
                }
            }

            // add room if no overlap
            if (!overlap) {
                rooms.add(selectedRoom);
                walls.remove(selectedWall);
                walls.addAll(selectedRoom.getWalls());
                connectRooms(selectedWall, selectedRoom);
                attempts = 0;
            } else {
                attempts++;
            }
        }
    }

    private void connectRooms(Wall wall, Room room) {
        // add door to wall and room
        wall.addDoor();
        room.addDoor(wall.getDoorPosition());

        // align rooms along door
        switch (wall.getOrientation()) {
            case Wall.HORIZONTAL:
                room.setY(wall.getY() - room.getHeight() + 1);
                break;
            case Wall.VERTICAL:
                room.setX(wall.getX() - room.getWidth() + 1);
                break;
        }
    }

    private class Room {
        private int x, y;
        private int width, height;
        private List<Wall> walls;

        public Room(int x, int y, int width, int height) {
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
            walls = new ArrayList<>();
            createWalls();
        }

        public Room(Wall wall) {
            switch (wall.getOrientation()) {
                case Wall.HORIZONTAL:
                    width = rand.nextInt(dungeonWidth/4) + 3;
                    height = rand.nextInt(dungeonHeight/2) + 3;
                    x = rand.nextInt(wall.getLength() - width) + wall.getX();
                    y = wall.getY() - height + 1;
                    break;
                case Wall.VERTICAL:
                    width = rand.nextInt(dungeonWidth/2) + 3;
                    height = rand.nextInt(dungeonHeight/4) + 3;
                    x = wall.getX() - width + 1;
                    y = rand.nextInt(wall.getLength() - height) + wall.getY();
                    break;
            }
            walls = new ArrayList<>();
            createWalls
```
Here's an example implementation of the algorithm in Java:

```java
import java.util.*;

public class DungeonMapGenerator {

    private int dungeonWidth;
    private int dungeonHeight;
    private int maxAttempts;
    private List<Room> rooms;
    private List<Wall> walls;
    private Random rand;

    public DungeonMapGenerator(int width, int height, int attempts) {
        dungeonWidth = width;
        dungeonHeight = height;
        maxAttempts = attempts;
        rooms = new ArrayList<>();
        walls = new ArrayList<>();
        rand = new Random();
    }

    public void generate() {
        // create first room
        Room firstRoom = new Room(0, 0, rand.nextInt(dungeonWidth/2) + 3, rand.nextInt(dungeonHeight/2) + 3);
        rooms.add(firstRoom);
        
        // add walls to wall list
        walls.addAll(firstRoom.getWalls());

        // add additional rooms
        int attempts = 0;
        while (attempts < maxAttempts && !walls.isEmpty()) {
            // select random wall and room to add
            int wallIndex = rand.nextInt(walls.size());
            Wall selectedWall = walls.get(wallIndex);
            Room selectedRoom = new Room(selectedWall);

            // attempt to move room if overlapping with existing rooms
            boolean overlap = false;
            for (Room r : rooms) {
                if (selectedRoom.intersects(r)) {
                    overlap = true;
                    for (int i = 0; i < 4; i++) {
                        selectedRoom.move(i);
                        if (!selectedRoom.intersects(r)) {
                            break;
                        }
                    }
                    if (overlap) {
                        break;
                    }
                }
            }

            // add room if no overlap
            if (!overlap) {
                rooms.add(selectedRoom);
                walls.remove(selectedWall);
                walls.addAll(selectedRoom.getWalls());
                connectRooms(selectedWall, selectedRoom);
                attempts = 0;
            } else {
                attempts++;
            }
        }
    }

    private void connectRooms(Wall wall, Room room) {
        // add door to wall and room
        wall.addDoor();
        room.addDoor(wall.getDoorPosition());

        // align rooms along door
        switch (wall.getOrientation()) {
            case Wall.HORIZONTAL:
                room.setY(wall.getY() - room.getHeight() + 1);
                break;
            case Wall.VERTICAL:
                room.setX(wall.getX() - room.getWidth() + 1);
                break;
        }
    }

    private class Room {
        private int x, y;
        private int width, height;
        private List<Wall> walls;

        public Room(int x, int y, int width, int height) {
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
            walls = new ArrayList<>();
            createWalls();
        }

        public Room(Wall wall) {
            switch (wall.getOrientation()) {
                case Wall.HORIZONTAL:
                    width = rand.nextInt(dungeonWidth/4) + 3;
                    height = rand.nextInt(dungeonHeight/2) + 3;
                    x = rand.nextInt(wall.getLength() - width) + wall.getX();
                    y = wall.getY() - height + 1;
                    break;
                case Wall.VERTICAL:
                    width = rand.nextInt(dungeonWidth/2) + 3;
                    height = rand.nextInt(dungeonHeight/4) + 3;
                    x = wall.getX() - width + 1;
                    y = rand.nextInt(wall.getLength() - height) + wall.getY();
                    break;
            }
            walls = new ArrayList<>();
            createWalls
```