Command Pattern implemented in Java

Command.java

interface DoorCommand {
    String execute();
}

class Door {
    String doorName;

    public Door(String doorName) {
        this.doorName = doorName;
    }

    @Override
    public String toString() {
        return doorName;
    }
}

class OpenCommand implements DoorCommand {
    Door door;

    public OpenCommand(Door door) {
        this.door = door;
    }

    @Override
    public String execute() {
        return "Opened " + door;
    }
}

class CloseCommand implements DoorCommand {

    Door door;

    public CloseCommand(Door door) {
        this.door = door;
    }

    @Override
    public String execute() {
        return "Closed " + door;
    }
}

class HAL9000DoorsOperations {
    
    DoorCommand openCommand;
    DoorCommand closeCommand;

    public HAL9000DoorsOperations(Door door) {
        openCommand = new OpenCommand(door);
        closeCommand = new CloseCommand(door);
    }

    public String open() {
        return openCommand.execute();
    }

    public String close() {
        return closeCommand.execute();
    }
}

public class Main {

    public static void main(String[] args) {
	// write your code here
        HAL9000DoorsOperations doorOperation = new HAL9000DoorsOperations(new Door("Steel Door"));
        System.out.println(doorOperation.open());
        System.out.print(doorOperation.close());
    }
}