装饰器模式

public interface Shape {
    void draw();
}

public class Circle implements Shape {
    private static final String TAG = "zhoumao";

    @Override
    public void draw() {
        Log.d(TAG, "draw: " + getClass().getName());
    }
}

public class Rectangle implements Shape {
   private static final String TAG = "zhoumao";

   @Override
   public void draw() {
      Log.d(TAG, "draw: "+"Shape: Rectangle");
   }
}

public abstract class ShapeDecorator implements Shape {
   protected Shape decoratedShape;

   public ShapeDecorator(Shape decoratedShape){
      this.decoratedShape = decoratedShape;
   }

   public void draw(){
      decoratedShape.draw();
   }    
}

public class RedShapeDecorator extends ShapeDecorator {
    private static final String TAG = "zhoumao";

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

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

    private void setRedBorder(Shape decoratedShape) {
        Log.d(TAG, "setRedBorder: " + "Border Color: Red");
    }
}

public class RotateShapeDecorator extends ShapeDecorator {

    private static final String TAG = "zhoumao";
    public RotateShapeDecorator(Shape decoratedShape) {
        super(decoratedShape);
    }

    @Override
    public void draw() {
        super.draw();
        setRotate();
    }

    private void setRotate(){
        Log.d(TAG, "setRotate: ");
    }
}

测试代码：

        Log.d(TAG, "Circle with normal border");
        circle.draw();


        Shape redCircle = new RedShapeDecorator(new Circle());
        Log.d(TAG, "\n******Circle of red border");
        redCircle.draw();

        Shape redRectangle = new RedShapeDecorator(new Rectangle());
        Log.d(TAG, "\n********Rectangle of red border");
        redRectangle.draw();

        Log.d(TAG, "\n**********Rectangle rotate of red border");
        Shape allRect = new RotateShapeDecorator(redRectangle);
        allRect.draw();

结果

05-06 05:10:40.650 7937-7937/? D/zhoumao: Circle with normal border
05-06 05:10:40.650 7937-7937/? D/zhoumao: draw: com.sankuai.tantan.decorator.Circle
05-06 05:10:40.650 7937-7937/? D/zhoumao: ******8Circle of red border
05-06 05:10:40.650 7937-7937/? D/zhoumao: draw: com.sankuai.tantan.decorator.Circle
05-06 05:10:40.650 7937-7937/? D/zhoumao: setRedBorder: Border Color: Red
05-06 05:10:40.650 7937-7937/? D/zhoumao: ********Rectangle of red border
05-06 05:10:40.650 7937-7937/? D/zhoumao: draw: Shape: Rectangle
05-06 05:10:40.650 7937-7937/? D/zhoumao: setRedBorder: Border Color: Red
05-06 05:10:40.650 7937-7937/? D/zhoumao: **********Rectangle rotate of red border
05-06 05:10:40.650 7937-7937/? D/zhoumao: draw: Shape: Rectangle
05-06 05:10:40.650 7937-7937/? D/zhoumao: setRedBorder: Border Color: Red
05-06 05:10:40.650 7937-7937/? D/zhoumao: setRotate: