//Button.java
public interface Button {
 String render();
}

//Checkbox.java
public interface Checkbox {
 String render();
}

//LightButton.java
class LightButton implements Button {
 public String render() { return "[ Save ]  (white background, dark text)"; }
}
//LightCheckbox.java
class LightCheckbox implements Checkbox {
 public String render() { return "[x] Notifications  (grey border)"; }
}

//DarkButton.java
class DarkButton implements Button {
 public String render() { return "[ Save ]  (charcoal background, light text)"; }
}
//DarkCheckbox.java
class DarkCheckbox implements Checkbox {
 public String render() { return "[x] Notifications  (glowing blue border)"; }
}

//UIFactory.java
public interface UIFactory {
 Button createButton();
 Checkbox createCheckbox();
}
//LightThemeFactory.java
class LightThemeFactory implements UIFactory {
 public Button createButton() { return new LightButton(); }
 public Checkbox createCheckbox() { return new LightCheckbox(); }
}
//DarkThemeFactory.java
class DarkThemeFactory implements UIFactory {
 public Button createButton() { return new DarkButton(); }
 public Checkbox createCheckbox() { return new DarkCheckbox(); }
}

//SettingsScreen.java
public class SettingsScreen {
 private final Button saveButton;
 private final Checkbox notifications;

 // The screen depends only on the abstract factory and abstract products
 SettingsScreen(UIFactory factory) {
  this.saveButton = factory.createButton();
  this.notifications = factory.createCheckbox();
 }

 void draw() {
  System.out.println("  " + notifications.render());
  System.out.println("  " + saveButton.render());
 }

 static UIFactory factoryFor(String theme) {          // the family is chosen in one place
  return theme.equals("dark") ? new DarkThemeFactory() : new LightThemeFactory();
 }

 public static void main(String[] args) {
  for (String theme : new String[] {"light", "dark"}) {
   System.out.println("Theme: " + theme);
   new SettingsScreen(factoryFor(theme)).draw();
  }
 }
}