We are learning about parent and child classes and I think I am confuisng what n

Question

We are learning about parent and child classes and I think I am confuisng what needs to go in the parent class and what needs to go in the child class it must also generate a random id for each order

// The package ID number is automatically assigned.

//In Package class, the base delivery price is determined using the following criteria:
// - Packages with weight of 32 ounces or less have a delivery fee of $5.00.
// - Packages with weight of more than 32 ounces incur an extra $0.12 fee per ounce.

//In InsuredPackage class, the insurance fee is calculated using the following criteria:
// - Packages with value of $20.00 or less have an insurance fee of $1.00.
// - Packages with a value of more than $20.00 have an insurance fee of $2.50.

Explanation / Answer

//Base class
/*Base class package that has methods to set ounces
and calculates the delivery charges */
//Package.java
public class Package
{
   private int packageID;
   private int ounces;
   private double deliveryCharges;
  
  
   //Constructor that sets the number of ounces
   public Package(int ounces)
   {
       //generage package id a random number in a range of 1000
       packageID=(int) (Math.random()*1000+1);
       setOunces(ounces);
   }
  
   //Constructor to delivery charges
   public Package(double deliveryCharges)
   {
       packageID=(int) (Math.random()*1000+1);
       this.deliveryCharges=deliveryCharges;
   }
  
  
   public int getID()
   {
       return packageID;
   }
  
   //Private method that set ounces and call
   //setDeliveryCharges
   private void setOunces(int ounces)
   {
       this.ounces=ounces;
       setDeliveryCharges(ounces);
   }

   //Set delivery charges of package of weight ounces
   private void setDeliveryCharges(int ounces)
   {      
       if(ounces<=32)
           //set charge
           deliveryCharges=5;
       else
       {          
           //set ounces grater than 32
           int remainingOunces=(ounces-5);          
           deliveryCharges=5+remainingOunces*0.12;
       }      
   }
  
   //return ounces
   public int getOunces()
   {
       return ounces;
   }
  
   //Return delivery charges
   public double getDeliveryCharges()
   {
       return deliveryCharges;
   }  
}

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

//Child class
/**The class InsuredPackage that extends the Package
* class that pass the deliveryCharges to the
* base class package and get the deliverycharge
* fee from base class in getInsuranceFee class*/
//InsuredPackage.java
public class InsuredPackage extends Package
{
   //constructor to set delivery charges for insured package
   public InsuredPackage(double deliveryCharges)
   {
       //call super class Package constructor
       super(deliveryCharges);      
   }
  
  
  
  
   /**Returns the insurance fee based on the delivery charges
   * fee*/
   public double getInsuranceFee()
   {
       if(super.getDeliveryCharges()<20)
           return 1;
       else
           return 2.50;
   }  
}

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

//Tester java program that tests the base class
//Package and InsuredPackage classes
//Driver.java
public class Driver
{
   public static void main(String[] args)
   {
      
       //Create an instance of Package with ounces as input
       Package packagee=new Package(32);
      
       System.out.println("Packagee");
       System.out.println("Package ID : "+packagee.getID());
       System.out.println("ounces : "+packagee.getOunces());
       System.out.println("Charges : "+packagee.getDeliveryCharges());
      
      
       //Create an instance of InsuredPackage with ounces as charges
       InsuredPackage insuredPackage=new InsuredPackage(25);
      
       System.out.println("Packagee");      
       System.out.println("Package ID : "+insuredPackage.getID());
       System.out.println("Insureance fee : "
               +insuredPackage.getInsuranceFee());
      
       System.out.println("Delivery Charges : "
               +insuredPackage.getDeliveryCharges());
      
      
      
   }

}

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

Sample Ouptut:

Packagee
Package ID : 104
ounces : 32
Charges : 5.0
Packagee
Package ID : 504
Insureance fee : 2.5
Delivery Charges : 25.0

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