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

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Explanation / Answer

/* Color.java */
public class Color {
  
   int green,red,blue;
   Color(int red,int green,int blue)
   {
       this.red=red;
       this.green=green;
       this.blue=blue;
   }

}

/* AlphaChannelColor.java */

public class AlphaChannelColor extends Color {

   int alpha;//local variable
  
   public static void main(String[] args) {
   //   Color c=new Color(l_red,l_green,l_blue);
      
   }
  
   AlphaChannelColor(int l_red,int l_green,int l_blue,int l_alpha)//4 parameter Constructor
   {
   super(l_alpha, l_alpha, l_alpha);//Calling Super class Color class constructor
       this.red=l_red;
       this.green=l_green;
       this.blue=l_blue;
       this.alpha=l_alpha;
   }
  
   public int getAlpha()//Getter method for alpha
   {
   return    alpha;
   }
}

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