Given the following blocks of Java code, add class headers, method headers and c

Question

Given the following blocks of Java code, add class headers, method headers and comments that provide a brief description of what each does.

public class Package
{
private int weight;
private char method;
private double cost;
final char AIR = 'A';
final char TRUCK = 'T';
final int LOWWT = 9;
final double LOWAIR = 2.00;
final double LOWTRUCK = 1.50;
final double LOWMAIL = 0.50;
final int MEDWT = 17;
final double MEDAIR = 3.00;
final double MEDTRUCK = 2.35;
final double MEDMAIL = 1.50;
final double HIGHAIR = 4.50;
final double HIGHTRUCK = 3.25;
final double HIGHMAIL = 2.15;
public Package(int w, char m)
{
weight = w;
method = m;
cost = calculateCost(w, m);
}

private double calculateCost(int w, char m)
{
double c;
if(w < LOWWT)
{
if(m == AIR)
c = LOWAIR;
else
if(m == TRUCK)
c = LOWTRUCK;
else
c = LOWMAIL;
}
else
if(w < MEDWT)
{
if(m == AIR)
c = MEDAIR;
else
if(m == TRUCK)
c = MEDTRUCK;
else
c = MEDMAIL;
}
else
{
if(m == AIR)
c = HIGHAIR;
else
if(m == TRUCK)
c = HIGHTRUCK;
else
c = HIGHMAIL;
}
return c;
}

public void display()
//money format//
{
System.out.println("The package weighs " +
weight + " pounds. Ship method " + method +
"Cost $" + cost);
}
public double getCost()
//get cost method//
{
return cost;
}
public void increaseCost(double c)
{
cost = cost + c;
}
}

public class InsuredPackage extends Package
{
InsuredPackage(int w, char m)
{
super(w, m);
final double LOWCOST = 1.01;
final double MEDCOST = 3.01;
final double LOWINS = 2.45;
final double MEDINS = 3.95;
final double HIGHINS = 5.55;
double i;
if(getCost() < LOWCOST)
i = LOWINS;
else
if(getCost() < MEDCOST)
i = MEDINS;
else
i = HIGHINS;
increaseCost(i);
}
}

public class UsePackage
{
public static void main(String args[])
{
Package p1 = new Package(4,'A'),
p2 = new Package(10,'T'),
p3 = new Package(20,'M');
InsuredPackage p4 = new InsuredPackage(4,'A'),
p5 = new InsuredPackage(10,'T'),
p6 = new InsuredPackage(20,'M');
System.out.println("Packages:");
p1.display();
p2.display();
p3.display();
System.out.println("Insured packages:");
p4.display();
p5.display();
p6.display();
}
}

Explanation / Answer

// class to check weight and method of the delivering Package and calculate cost
public class Package
{
   private int weight;
   private char method;
   private double cost;
   final char AIR = 'A';
   final char TRUCK = 'T';
   final int LOWWT = 9;
   final double LOWAIR = 2.00;           //define lows for Air,Truck and mail packages
   final double LOWTRUCK = 1.50;
   final double LOWMAIL = 0.50;
   final int MEDWT = 17;                   //define lows for Air,Truck and mail packages
   final double MEDAIR = 3.00;
   final double MEDTRUCK = 2.35;
   final double MEDMAIL = 1.50;
   final double HIGHAIR = 4.50;               //define lows for Air,Truck and mail packages
   final double HIGHTRUCK = 3.25;
   final double HIGHMAIL = 2.15;
   public Package(int w, char m)           //Package constructor
   {
      weight = w;
      method = m;
      cost = calculateCost(w, m);        //calculate the cost of Package based on weight and method used
   }

   private double calculateCost(int w, char m)
   {
      double c;
      if(w < LOWWT)
      {
        if(m == AIR)             //if method is AIR and weight is less than LOWWT cost = LOWAIR
           c = LOWAIR;
        else
           if(m == TRUCK)      //if method is TRUCK and weight is less than LOWWT cost = LOWTRUCK
              c = LOWTRUCK;
           else
              c = LOWMAIL;   //if method is Mail and weight is less than LOWWT cost = LOWMAIL
      }
      else
         if(w < MEDWT)       //for medium weight
         {
            if(m == AIR)
               c = MEDAIR;      //method = AIR cost = MEDAIR
            else
               if(m == TRUCK)
                  c = MEDTRUCK;   //method = TRUCK cost = MEDTRUCK
               else
                  c = MEDMAIL;    //method = Mail cost = MEDMAIL
         }
         else              //high cost
         {
            if(m == AIR)
               c = HIGHAIR;
            else
               if(m == TRUCK)
                  c = HIGHTRUCK;
               else
                  c = HIGHMAIL;
         }
      return c;
   }

   //display package weight ,shipping method and cost

   public void display()
   //money format//
   {
      System.out.println("The package weighs " +
         weight + " pounds. Ship method " + method +
         "Cost $" + cost);
   }

   //get method for cost
   public double getCost()
   //get cost method//
   {
      return cost;
   }

   //method to increase cost
   public void increaseCost(double c)
   {
      cost = cost + c;
   }
}

//derived class from Package
public class InsuredPackage extends Package
{
   InsuredPackage(int w, char m)
   {
       //call base class constructor passing weight and method as arguments
      super(w, m);
    
      //define constants for low,medium and high costs and insurances
      final double LOWCOST = 1.01;
      final double MEDCOST = 3.01;
      final double LOWINS = 2.45;
      final double MEDINS = 3.95;
      final double HIGHINS = 5.55;
      double i;
      if(getCost() < LOWCOST)   // if cost less than LOWCOST ,low insurance
         i = LOWINS;
      else
         if(getCost() < MEDCOST)   // if cost less than MedCOST ,med insurance
            i = MEDINS;
         else
            i = HIGHINS;    // if cost less than highCOST ,high insurance
      increaseCost(i);     //add insurance to the cost of delivery
   }
}

public class UsePackage
{
   public static void main(String args[])
   {
       //create package instances with weight and method and calculate total cost for package delivery plus insurance
       Package p1 = new Package(4,'A'),
       p2 = new Package(10,'T'),
       p3 = new Package(20,'M');
       InsuredPackage p4 = new InsuredPackage(4,'A'),
       p5 = new InsuredPackage(10,'T'),
       p6 = new InsuredPackage(20,'M');
       System.out.println("Packages:");
       p1.display();
       p2.display();
       p3.display();
       System.out.println("Insured packages:");
       p4.display();
       p5.display();
       p6.display();
   }
}

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