public class Thermostat {
    public void setTemperature(int temperature) {
        System.out.println("Setting thermostat to " + temperature + " degrees.");
    }
}

public class Lights {
    public void on() {
        System.out.println("Lights are on.");
    }

    public void off() {
        System.out.println("Lights are off.");
    }
}

public class CoffeeMaker {
    public void brewCoffee() {
        System.out.println("Brewing coffee.");
    }
}

public class SmartHomeFacade {
    private Thermostat thermostat;
    private Lights lights;
    private CoffeeMaker coffeeMaker;

    public SmartHomeFacade(
        Thermostat thermostat, Lights lights, CoffeeMaker coffeeMaker
    ) {
        this.thermostat = thermostat;
        this.lights = lights;
        this.coffeeMaker = coffeeMaker;
    }

    public void wakeUp() {
        System.out.println("Waking up...");
        thermostat.setTemperature(22);
        lights.on();
        coffeeMaker.brewCoffee();
    }

    public void leaveHome() {
        System.out.println("Leaving home...");
        thermostat.setTemperature(18);
        lights.off();
    }
}

public class Main {
    public static void main(String[] args) {
        Thermostat thermostat = new Thermostat();
        Lights lights = new Lights();
        CoffeeMaker coffeeMaker = new CoffeeMaker();

        SmartHomeFacade smartHome
         = new SmartHomeFacade(thermostat, lights, coffeeMaker);

        smartHome.wakeUp();
        smartHome.leaveHome();
    }
}

Waking up...
Setting thermostat to 22 degrees.
Lights are on.
Brewing coffee.

Leaving home...
Setting thermostat to 18 degrees.
Lights are off.

class FileReader {
    public String readFile(String filePath)
     throws IOException {
        return new String(Files.readAllBytes(Paths.get(filePath)));
    }
}

class FileWriter {
    public void writeFile(String filePath, String content)
     throws IOException {
        Files.write(Paths.get(filePath), content.getBytes());
    }
}

class FileDeleter {
    public void deleteFile(String filePath)
     throws IOException {
        Files.delete(Paths.get(filePath));
    }
}

class FileSystemFacade {
    private FileReader fileReader;
    private FileWriter fileWriter;
    private FileDeleter fileDeleter;

    public FileSystemFacade() {
        this.fileReader = new FileReader();
        this.fileWriter = new FileWriter();
        this.fileDeleter = new FileDeleter();
    }

    public String readFile(String filePath) {
        try {
            return fileReader.readFile(filePath);
        } catch (IOException e) {
            System.err.println("Error reading file: " + e.getMessage());
            return null;
        }
    }

    public boolean writeFile(String filePath, String content) {
        try {
            fileWriter.writeFile(filePath, content);
            return true;
        } catch (IOException e) {
            System.err.println("Error writing file: " + e.getMessage());
            return false;
        }
    }

    public boolean deleteFile(String filePath) {
        try {
            fileDeleter.deleteFile(filePath);
            return true;
        } catch (IOException e) {
            System.err.println("Error deleting file: " + e.getMessage());
            return false;
        }
    }
}

// Client code demonstrating the use of FileSystemFacade
public class Main {
    public static void main(String[] args) {
        FileSystemFacade fs = new FileSystemFacade();

        // Write to file
        boolean writeSuccess = fs.writeFile(
            "test.txt", "Hello, Facade Pattern!"
        );
        System.out.println("File write success: " + writeSuccess);

        // Read from file
        String content = fs.readFile("test.txt");
        System.out.println("File content: " + content);

        // Delete file
        boolean deleteSuccess = fs.deleteFile("test.txt");
        System.out.println(
            "File delete success: " + deleteSuccess
        );
    }
}

File write success: true
File content: Hello, Facade Pattern!
File delete success: true