Here's some Java code that implements the algorithm you described:

import java.util.ArrayList;
import java.util.Random;

public class DungeonMapGenerator {

    private int numRooms;
    private int maxAttempts;
    private ArrayList<Room> rooms;
    private Random random;

    public DungeonMapGenerator(int numRooms, int maxAttempts) {
        this.numRooms = numRooms;
        this.maxAttempts = maxAttempts;
        this.rooms = new ArrayList<Room>();
        this.random = new Random();
    }

    public ArrayList<Room> generate() {
        Room firstRoom = new Room(random.nextInt(10), random.nextInt(10), random.nextInt(10), random.nextInt(10));
        rooms.add(firstRoom);

        for (int i = 1; i < numRooms; i++) {
            Wall wall = selectWall();
            Room room = selectRoom();
            Door door = new Door(random.nextInt(wall.getLength()), wall);
            room.addDoor(door);
            boolean success = false;
            int attempts = 0;
            while (!success && attempts < maxAttempts) {
                room.setPosition(random.nextInt(10), random.nextInt(10));
                success = !overlapExists(room);
                attempts++;
            }
            if (success) {
                rooms.add(room);
                alignRooms(room, wall, door);
            }
        }
        return rooms;
    }

    private Wall selectWall() {
        Room room = rooms.get(random.nextInt(rooms.size()));
        return room.getWalls().get(random.nextInt(room.getWalls().size()));
    }

    private Room selectRoom() {
        return new Room(random.nextInt(10), random.nextInt(10), random.nextInt(10), random.nextInt(10));
    }

    private boolean overlapExists(Room newRoom) {
        for (Room room : rooms) {
            if (room.overlaps(newRoom)) {
                return true;
            }
        }
        return false;
    }

    private void alignRooms(Room room, Wall wall, Door door) {
        switch (wall.getOrientation()) {
            case HORIZONTAL:
                if (door.getX() < room.getX()) {
                    room.move(room.getX() - door.getX(), 0);
                } else if (door.getX() > room.getX() + room.getWidth()) {
                    room.move(room.getX() + room.getWidth() - door.getX(), 0);
                }
                break;
            case VERTICAL:
                if (door.getY() < room.getY()) {
                    room.move(0, room.getY() - door.getY());
                } else if (door.getY() > room.getY() + room.getHeight()) {
                    room.move(0, room.getY() + room.getHeight() - door.getY());
                }
                break;
        }
    }

    private enum Orientation {
        HORIZONTAL,
        VERTICAL
    }

    private class Door {
        private int position;
        private Wall wall;

        public Door(int position, Wall wall) {
            this.position = position;
            this.wall = wall;
        }

        public int getX() {
            if (wall.getOrientation() == Orientation.HORIZONTAL) {
                return wall.getStartX() + position;
            } else {
                return wall.getStartX();
            }
        }

        public int getY() {
            if (wall.getOrientation() == Orientation.VERTICAL) {
                return wall.getStartY() + position;
            } else {
                return wall.getStartY();
            }
        }
    }

    private class Wall {
        private int startX;
        private int startY;
        private int length;
        private Orientation orientation;

        public Wall(int startX, int startY, int length, Orientation orientation) {
            this.startX = startX;
            this.startY = startY;
            this.length = length;
            this.orientation = orientation;
        }

        public int getStart    X() {
        return startX;
    }

    public int getStartY() {
        return startY;
    }

    public int getLength() {
        return length;
    }

    public Orientation getOrientation() {
        return orientation;
    }
}

private class Room {
    private int x;
    private int y;
    private int width;
    private int height;
    private ArrayList<Door> doors;
    private ArrayList<Wall> walls;

    public Room(int x, int y, int width, int height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
        this.doors = new ArrayList<Door>();
        this.walls = new ArrayList<Wall>();
        walls.add(new Wall(x, y, width, Orientation.HORIZONTAL));
        walls.add(new Wall(x, y, height, Orientation.VERTICAL));
        walls.add(new Wall(x, y + height, width, Orientation.HORIZONTAL));
        walls.add(new Wall(x + width, y, height, Orientation.VERTICAL));
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public ArrayList<Door> getDoors() {
        return doors;
    }

    public ArrayList<Wall> getWalls() {
        return walls;
    }

    public void addDoor(Door door) {
        doors.add(door);
    }

    public boolean overlaps(Room other) {
        return (x < other.x + other.width) && (x + width > other.x) && (y < other.y + other.height) && (y + height > other.y);
    }

    public void setPosition(int newX, int newY) {
        x = newX;
        y = newY;
        walls.get(0).startX = newX;
        walls.get(1).startY = newY;
        walls.get(2).startY = newY + height;
        walls.get(3).startX = newX + width;
        for (Door door : doors) {
            door.wall = getMatchingWall(door.wall);
        }
    }

    public void move(int dx, int dy) {
        setPosition(x + dx, y + dy);
    }

    private Wall getMatchingWall(Wall other) {
        for (Wall wall : walls) {
            if (wall.getOrientation() == other.getOrientation()) {
                switch (wall.getOrientation()) {
                    case HORIZONTAL:
                        if (wall.getStartY() == other.getStartY() && wall.getStartX() <= other.getStartX() && wall.getStartX() + wall.getLength() >= other.getStartX()) {
                            return wall;
                        }
                        break;
                    case VERTICAL:
                        if (wall.getStartX() == other.getStartX() && wall.getStartY() <= other.getStartY() && wall.getStartY() + wall.getLength() >= other.getStartY()) {
                            return wall;
                        }
                        break;
                }
            }
        }
        return null;
    }
}



Here's how to use the `DungeonMapGenerator` class to generate a dungeon map with 10 rooms and a maximum of 100 attempts per room:

```java
DungeonMapGenerator generator = new DungeonMapGenerator(10, 100);
ArrayList<Room> rooms = generator.generate();
for (Room room : rooms) {
    System.out.println("Room at (" + room.getX() + ", " + room.getY() + ") with dimensions " + room.getWidth() + " x " + room.getHeight());
}

Room at (0, 0) with dimensions 6 x 3
Room at (0, 5) with dimensions 2 x 5
Room at (6, 2) with dimensions 4 x 5
Room at (4, 0) with dimensions 4 x 4
Room at (6, 8) with dimensions 3 x 2
Room at (2, 8) with dimensions 4 x 2
Room at (0, 8) with dimensions 2 x 2
Room at (10, 0) with dimensions 3 x 3
Room at (10, 3) with dimensions 2 x 2
Room at (8, 0) with dimensions 2 x 3


Note that the output may vary, as the algorithm generates a different map every time it's run.
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