A Color class has a constructor that accepts three integer parameters : red, gre

Question

A Color class  has a constructor  that accepts three integer  parameters : red, green and blue components  in the range of 0 ... 255 with 0 representing no contribution of the component  and 255 being the most intense value  for that component .

The effect of full or semi-transparency can be achieved by adding another component  to the color called an alpha channel. This value  can also be defined to be in the range of 0...255 with 0 representing opaque or totally non-transparent, and 255 representing full transparency.

Define a class  AlphaChannelColor to be a subclass of the Color class . AlphaChannelColor should have the following: - an integer  instance variable  alpha - a constructor  that accepts four parameters : red, green, blue and alpha values  in that order. The first three should be passed up to the Color class ' constructor , and the alpha value  should be used to initialize  the alpha instance variable . - a getter (accessor) method  for the alpha instance variable

Explanation / Answer

Hi,

The following is an executable code with the specified classes.

class Color
{
    int red, green, blue;
    Color(int color1, int color2, int color3)
    {
        red = color1;
        green = color2;
        blue = color3;               
    }
   
    public void displayColor()
    {
        if (red == 0)
            System.out.println("Contibution of Red color is nill.");
        else if (red == 255)
            System.out.println("Contibution of Red color is complete.");
        else if (red > 0 || red < 255)
            System.out.println("Contibution of Red color is partial.");
        if (green == 0)
            System.out.println("Contibution of green color is nill.");
        else if (green == 255)
            System.out.println("Contibution of green color is complete.");
        else if (green > 0 || green < 255)
            System.out.println("Contibution of green color is partial.");
        if (blue == 0)
            System.out.println("Contibution of blue color is nill.");
        else if (blue == 255)
            System.out.println("Contibution of blue color is complete.");
        else if (blue > 0 || blue < 255)
            System.out.println("Contibution of blue color is partial.");       
    }
}

public class AlphaChannelColor extends Color
{
    int alpha;
    public int getAlpha()
    {
        return alpha;
    }
   
    AlphaChannelColor(int red, int green, int blue, int alphaValue)
    {
        super(red, green, blue);
        this.alpha = alphaValue;       
    }
   
    public void displayAlpha()
    {
        if (alpha == 0)
            System.out.println("Alpha contribution resulted in" +
                    " opaque or non transparent.");
        else if (alpha > 0 || alpha < 255)
            System.out.println("Alpha contribution resulted in" +
                    " partial transparency.");
        else if (alpha == 255)
            System.out.println("Alpha contribution resulted in" +
                    " complete transparency.");
    }

    public static void main(String[] args)
    {
        AlphaChannelColor acc = new AlphaChannelColor(255, 150, 255, 100);
        acc.displayColor();
        acc.displayAlpha();       
    }
}

Hope this will help you.

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