abstract class Shape
{
    // Placeholder
    abstract public double getArea( );
}

interface Stretchable
{
    abstract public void stretch( );
    abstract public void stretch( double expandFactor );
}

interface Colorable
{
    abstract public String getColor( );
    abstract public void setColor( String color );
}

class Circle extends Shape
{
    public static final double PI = 3.14;
    
    public Circle( double r )
    {
        radius = r;
    }
    
    public String toString( )
    {
        return "Circle with radius " + radius;
    }
    
    public double getArea( )
    {
        return PI * radius * radius;
    }
    
    private double radius;
}



class Ellipse extends Shape implements Stretchable
{
    public Ellipse( double len, double wid )
    {
        length = len;
        width = wid;
    }
    
    public void stretch( )
    {
        stretch( 2.0 );
    }
    
    public void stretch( double expandFactor )
    {
        length *= expandFactor;
    }
    
    public double getArea( )
    {
        return Circle.PI / 4 * length * width;
    }
    
    public String toString( )
    {
        return "Ellipse with dimensions " + length + "*" + width;
    }
    
    double length;
    double width;
}


class Rectangle extends Shape implements Stretchable, Colorable
{
    public Rectangle( double len, double wid, String c )
    {
        length = len;
        width = wid;
        color = c;
    }
    
    public Rectangle( double len, double wid )
    {
        this( len, wid, "blue" );
    }
    
    public void stretch( )
    {
        stretch( 2.0 );
    }
    
    public void stretch( double expandFactor )
    {
        length *= expandFactor;
    }
    
    public String getColor( )
    {
        return color;
    }
    
    public void setColor( String c )
    {
        color = c;
    }
    
    public double getArea( )
    {
        return length * width;
    }
    
    public String toString( )
    {
        return "Rectangle with dimensions " + length + "*" + width
                  + " with color " + color;
    }
    
    private double length;
    private double width;
    private String color;
}


class Square extends Shape implements Colorable
{
    public Square( double s, String c )
    {
        side = s;
        color = c;
    }
    
    public Square( double s )
    {
        this( s, "green" );
    }

    public String toString( )
    {
        return "Square with side " + side + " with color " + color;
    }
    
    public String getColor( )
    {
        return color;
    }
    
    public void setColor( String c )
    {
        color = c;
    }
    
    public double getArea( )
    {
        return side * side;
    }
    
    private double side;
    private String color;
}

class Day14
{

    public static double getTotalArea( Shape [ ] arr )
    {
        double sum = 0.0;
        
        for( Shape s : arr )
            sum += s.getArea( );
        
        return sum;
    }
        
    public static void stretchAll( Stretchable [ ] arr )
    {
        for( Stretchable s : arr )
            s.stretch( );
    }
    
    public static void stretchAll( Shape [ ] arr )
    {
        for( Shape s : arr )
            if( s instanceof Stretchable )
                ((Stretchable)s).stretch( );
    }
    
    public static void color( Shape [ ] arr, String color )
    {
        for( Shape s : arr )
            if( s instanceof Colorable )
                ((Colorable)s).setColor( color );
    }
    
    
    public static void printArray( Object [ ] arr, String str )
    {
        for( int i = 0; i < arr.length; i++ )
            System.out.println( str + "[" + i + "] = " + arr[ i ] );
    }
    
    public static void main( String [ ] args )
    {
        Circle [ ] arr1 = { new Circle( 2 ), new Circle( 4 ) };
        Square [ ] arr2 = { new Square( 2 ), new Square( 4 ) };
        
        printArray( arr1, "Circle" );
        System.out.println( "Total area is: " + getTotalArea( arr1 ) );
        
        printArray( arr2, "Square" );
        System.out.println( "Total area is: " + getTotalArea( arr2 ) );
     
        Shape [ ] arr3 = { arr1[ 0 ], arr2[ 0 ],
                        arr1[ 1 ], arr2[ 1 ], new Rectangle( 4, 5 ),
                           new Ellipse( 3, 6 ) };
        printArray( arr3, "Shape" );
        System.out.println( "Total area is: " + getTotalArea( arr3 ) );
        
        stretchAll( arr3 );
        
        printArray( arr3, "Shape" );
        System.out.println( "Total area is: " + getTotalArea( arr3 ) );

        color( arr3, "white" );
        printArray( arr3, "Shape" );
        
        
    }
    
}