I need help debugging. Joyce Farrells, Programming Design and Logic 8th Edition,

Question

I need help debugging. Joyce Farrells, Programming Design and Logic 8th Edition, Chapter 11.

This diagram describes a Sunglasses class and a Prescription on Sunglasses class that inherits from it. The Sunglasses class contains a string style and a numeric darkness value that is required to be a number from 1 through 4. The subclass also includes two numbers for OS (left eye) value and OD (right eye) value. These typically are numbers such as +3.0 (which ?s moderately farsighted) or -1.5 (which is slightly nearsighted),

Explanation / Answer

//Class declaration for Sunglasses

//Sunglasses.java
public class Sunglasses
{
   //private members of class Sunglasses
   private String style;
   private int darkness;
  
   //default constructor
   public Sunglasses()
   {
      ;
       darkness=0;
   }
  
   //parameterized constructor that sets style and darkness
   public Sunglasses(String style, int darkness)
   {
       this.style=style;
       this.darkness=darkness;
   }
  
  
   //Sets the style
   public void steStyle(String style)
   {
       this.style=style;
   }
  
   //Returns style
   public String getStyle()
   {
       return style;
   }
  
   //Sets the darkness
   public void setDarkness(int darkness)
   {
       if(darkness>0 && darkness<=4)
           this.darkness=darkness;
       else
           System.out.println("Invalid darkness");
   }
  
   //Returns the darkness
   public int getDarkness()
   {
       return darkness;
   }
  
}

---------------------------------------------------

//Class declaration for PrescriptionSunglasses

//PrescriptionSunglasses.java
//This class extends the super class Sunglasses
public class PrescriptionSunglasses
       extends Sunglasses
{

   //private members of class
   private double os;
   private double od;
  
   //Default constructor
   public PrescriptionSunglasses()
   {
       //call super class(Sunglasses) default constructor
       super();
       os=0;
       od=0;
   }
  
   public PrescriptionSunglasses(String style, int darkness,double os, double od)
   {
       //calling super class(Sunglasses) argumented constructor to
       //ste style and darkness
       super(style, darkness);
       //set os and od values
       this.os=os;
       this.od=od;
   }
  
   //Set osNum
   public void setOs(double osNum)
   {
       this.os=osNum;
   }
   //Returns os number
   public double getOs()
   {
       return os;
   }
  
   //Set odNum
   public void setOd(double odNum)
   {
       this.od=odNum;
   }
   //Returns od number
   public double getOd()
   {
       return od;
   }  
}

---------------------------------------------------

//Tester java program that test the class
//PrescriptionSunglasses
//Driver.java
public class Driver
{
   public static void main(String[] args)
   {      
       //Create an instance of PrescriptionSunglasses object
       //with style, darkness ,left eye value and right eye values
       PrescriptionSunglasses prescription=new PrescriptionSunglasses("Cool", 1, 3,-1.5);
      
       //print prescription object
       System.out.println("Presciption");
       System.out.println("Style : "+prescription.getStyle());
       System.out.println("Darkness : "+prescription.getDarkness());
       System.out.println("Left eye : "+prescription.getOs());
       System.out.println("Right eye : "+prescription.getOd());  
   }
}

---------------------------------------------------
Sample output:

Presciption
Style : Cool
Darkness : 1
Left eye : 3.0
Right eye : -1.5

Hope this helps you

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