Абстрактная фабрика. Пример кода

public interface GuiFactory {
    Button createButton();
    Checkbox createCheckbox();
}

public interface Button extends Cloneable {
    void click();
    Button clone();
}

public interface Checkbox extends Cloneable {
    void check();
    Checkbox clone();
}

public class NixButton implements Button {
    @Override
    public void click() {
        System.out.println("NixButton clicked");
    }
   
    @Override
    public Button clone() {
        return new NixButton();
    }
}

public class WinButton implements Button {
    @Override
    public void click() {
        System.out.println("WinButton clicked");
    }
   
    @Override
    public Button clone() {
        return new WinButton();
    }
}

public class NixCheckbox implements Checkbox {
    @Override
    public void check() {
        System.out.println("NixCheckbox checked");
    }
   
    @Override
    public Checkbox clone() {
        return new NixCheckbox();
    }
}

public class WinCheckbox implements Checkbox {
    @Override
    public void check() {
        System.out.println("WinCheckbox checked");
    }
   
    @Override
    public Checkbox clone() {
        return new WinCheckbox();
    }
}

public class NixGuiFactory implements GuiFactory{
    @Override
    public Button createButton() {
        return new NixButton();
    }
   
    @Override
    public Checkbox createCheckbox() {
        return new NixCheckbox();
    }
}

public class WinGuiFactory implements GuiFactory {
    @Override
    public Button createButton() {
        return new WinButton();
    }

    @Override
    public Checkbox createCheckbox() {
        return new WinCheckbox();
    }
}

public enum GuiTypes {
    WIN, NIX
}

final public class GuiCreator {
    final Button button;
    final Checkbox checkbox;
   
    public GuiCreator(GuiFactory factory) {
        button = factory.createButton();
        checkbox = factory.createCheckbox();
    }
   
    public Button getNewButton() {
        return button.clone();
    }
   
    public Checkbox getNewCheckbox() {
        return checkbox.clone();
    }
}

public class Application {
    public static void main(String args[]) {
        GuiTypes guiType = GuiTypes.WIN;
        GuiFactory factory = null;
       
        switch (guiType) {
            case NIX:
                factory = new NixGuiFactory();
                break;
            case WIN:
                factory = new WinGuiFactory();
                break;
            default:
                throw new IllegalStateException();
        }
       
        GuiCreator guiCreator = new GuiCreator(factory);
        Button button = guiCreator.getNewButton();
        Checkbox checkbox = guiCreator.getNewCheckbox();
        button.click();
        checkbox.check();
    }
}