Java Decorator sample

Decorator.java

// Decorator 
// Test it here: https://www.compilejava.net/
// Source: https://sourcemaking.com/design_patterns/decorator
// Intent: Attach additional responsibilities to an object dynamically

interface Widget {
  void draw();
}

class TextWidget implements Widget {
  public TextWidget(int x, int y){
  }
  
  public void draw(){
    System.out.println("TextWidget");
  }
}

abstract class Decorator implements Widget {
  Widget widget;

  public Decorator(Widget w){
    widget = w;
  }
  
  public void draw(){
    widget.draw();
  }
}

class BorderDecorator extends Decorator {
  public BorderDecorator(Widget w){
    super(w);
  }
  public void draw(){
    super.draw();
    System.out.println("BorderDecorator");
  }
}

public class Main
{
  public static void main(String[] args)
  {
    Widget w = new BorderDecorator(new TextWidget(10,10));
    w.draw();
  }
}