Decorator Design pattern - Implementation [Shape]

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Decorator Design pattern - Implementation [Shape]

Decorator Design pattern - Implementation [Shape] - Class Diagram

Shape.java

public interface Shape

{

void draw();

}

Circle.java

public class Circle implements Shape

{

@Override

public void draw()

{

System.out.println("Shape: Circle has been drawn");

}

}

Rectangle.java

public class Rectangle implements Shape

{

@Override

public void draw()

{

System.out.println("Shape: Rectangle has been drawn");

}

}

ShapeDecorator.java

public abstract class ShapeDecorator implements Shape

{

protected Shape decoratedShape;

public ShapeDecorator( Shape decoratedShape )

{

this.decoratedShape = decoratedShape;

}

public void draw()

{

decoratedShape.draw();

}

}

BlueShapeDecorator.java

public class BlueShapeDecorator extends ShapeDecorator
{

public BlueShapeDecorator( Shape decoratedShape )
{
super(decoratedShape);
}

@Override
public void draw()
{
decoratedShape.draw();
setColor(decoratedShape);
}

private void setColor( Shape decoratedShape )
{
System.out.println("Color: Blue has been applied to "+decoratedShape);
}
}

DecoratorPatternDemo.java

public class DecoratorPatternDemo
{
public static void main(String[] args)
{

Shape blueCircle = new BlueShapeDecorator(new Circle());

Shape blueRectangle = new BlueShapeDecorator(new Rectangle());

System.out.println("\nCreate Blue color Circle using BlueShapeDecorator");
blueCircle.draw();

System.out.println("\nCreate Blue color Rectangle using BlueShapeDecorator");
blueRectangle.draw();
}
}

Ouput

Create Blue color Circle using BlueShapeDecorator
Shape: Circle has been drawn
Color: Blue has been applied to Circle@30c221

Create Blue color Rectangle using BlueShapeDecorator
Shape: Rectangle has been drawn
Color: Blue has been applied to Rectangle@119298d

See also:

Decorator Design pattern - Introduction

Decorator Design pattern - Real Time Example [Dosa]

Decorator Design pattern - Real Time Example [Ice Cream]

Decorator Design pattern - Real Time Example [Pizza]

Decorator Design pattern - Real Time Example [Car]

Decorator Design pattern - Class Diagram

Decorator Design pattern - Sequence Diagram

Decorator Design pattern - Implementation [Dosa]

Decorator Design pattern - Implementation [Pizza]

Decorator Design pattern - Implementation [Ice Cream]

Decorator Design pattern - Implementation [Car]

Decorator Design pattern - Key Points

All Design Patterns Links