FactoryDemo.java

// Product interface
interface GamingPeripheral {
    void use();
}

// Concrete product classes
class RazerKeyboard implements GamingPeripheral {
    public void use() {
        System.out.println("Typing on Razer keyboard");
    }
}

class RazerMouse implements GamingPeripheral {
    public void use() {
        System.out.println("Clicking Razer mouse");
    }
}

class RazerHeadset implements GamingPeripheral {
    public void use() {
        System.out.println("Playing sound on Razer headset");
    }
}

class SteelSeriesKeyboard implements GamingPeripheral {
    public void use() {
        System.out.println("Typing on SteelSeries keyboard");
    }
}

class SteelSeriesMouse implements GamingPeripheral {
    public void use() {
        System.out.println("Clicking SteelSeries mouse");
    }
}

class SteelSeriesHeadset implements GamingPeripheral {
    public void use() {
        System.out.println("Playing sound on SteelSeries headset");
    }
}

// Factory class
class PeripheralFactory {
    public static GamingPeripheral createPeripheral(String type, String brand) {
        if (brand.equalsIgnoreCase("Razer")) {
            switch (type.toLowerCase()) {
                case "keyboard":
                    return new RazerKeyboard();
                case "mouse":
                    return new RazerMouse();
                case "headset":
                    return new RazerHeadset();
            }
        } else if (brand.equalsIgnoreCase("SteelSeries")) {
            switch (type.toLowerCase()) {
                case "keyboard":
                    return new SteelSeriesKeyboard();
                case "mouse":
                    return new SteelSeriesMouse();
                case "headset":
                    return new SteelSeriesHeadset();
            }
        }
        throw new IllegalArgumentException("Unknown type or brand");
    }
}

public class FactoryDemo {
    public static void main(String[] args) {
        GamingPeripheral keyboard = PeripheralFactory.createPeripheral("keyboard", "Razer");
        GamingPeripheral mouse = PeripheralFactory.createPeripheral("mouse", "Razer");
        GamingPeripheral headset = PeripheralFactory.createPeripheral("headset", "SteelSeries");

        keyboard.use();
        mouse.use();
        headset.use();
    }
}