how to generate barcode in asp net core

barcode in asp net core

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In this statement, I assign create a VolvoCar object and assign it to a Car variable. Treating a derived object as though it were an instance of a base object is called upcasting, and it means that we can add classes to our program, and objects created from these classes can still be handled using their base types. When you upcast an object, you lose access to any specializations that have been introduced over the base class. In the case of the previous code statement, I can use the object assigned to the myCar variable as a Car, but not VolvoCar. I cannot access the additional field that VolvoCar introduces, and this makes sense; otherwise, you d end up with some Car instances that had special features that other instances didn t. If a derived class has overridden a method from the base class using the override keyword, it is the derived implementation that is used when the method is called, as demonstrated by Listing 6-18. Listing 6-18. Polymorphism and Derived Method Implementations using System; class Car { public string CarOwner; public string PaintColor; public int MilesPerGallon; public Car(string newOwner, string paintColor, int mpg) { CarOwner = newOwner; PaintColor = paintColor; MilesPerGallon = mpg; } public virtual int CalculateFuelForTrip(int tripDistance) { return tripDistance / MilesPerGallon; } } class VolvoCar : Car { public string VolvoSoundSystem; public VolvoCar(string owner, string paint, int mpg, string sound) : base(owner, paint, mpg) { // set the value of the VolvoSoundSystem VolvoSoundSystem = sound; } public override int CalculateFuelForTrip(int tripDistance) { System.Console.WriteLine("Derived Method Called"); return base.CalculateFuelForTrip(tripDistance); } } class Listing 18 { static void Main(string[] args) {

// create a new instance fof VolvoCar and upcast it to Car Car myCar = new VolvoCar("Adam Freeman", "Black", 30, "Premium"); // call the CalculateFuelForTrip method and print out the result int result = myCar.CalculateFuelForTrip(1000); Console.WriteLine("Result: {0} gallons", result); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, the derived class, VolvoCar, has overridden the CalculateFuelForTrip method defined in the base class, Car. The derived version of the method prints out a message to the console and then calls the base implementation to calculate the result. The Main method of the Listing 17 class creates an instance of VolvoCar and upcasts it by assigning it to a Car variable. The CalculateFuelForTrip method is called, and the result from the method is printed out. Here are the results of compiling and running Listing 6-18: Derived Method Called Result: 33 gallons Press enter to finish The results show the behavior I described. When you upcast an object, the overridden implementations of methods are used, but you are no longer able to access any members that are not defined in the type you have upcast to.

The repurchase rate is further complicated by the fact that Asian has many different models of cars, and each model has its own unique repurchase rate The goal for any automobile company is to have a repurchase rate of more than 100 percent How would that be possible It would occur if customers never died, if they always bought the same brand when they turned in their existing vehicle, and if many of them bought two or more cars For the automobile industry as a whole, the repurchase rate is about 35 percent The goal is to determine the repurchase rate for every Asian model and for owners of used Asian cars as well To accomplish this, it is necessary to develop some tables from the database that illustrate the situation Such tables should begin with a particular year, such as 1997.

import java.beans.ConstructorProperties; public class Point { private double x, y; public Point() { } @ConstructorProperties({"x", "y"}) public Point(double x, double y) { this.x = x; this.y = y; } public double getX() { return x; } public double getY() { return y; } public void setX(double x) { this.x = x; } public void setY(double y) { this.y = y; } }

Note Derived classes can hide a base member rather than override it. When this happens, the derived implementation is used when the object is referred to by its declared type, and the base implementation is referenced when the object is upcast. In effect, the behavior you get from your object can be made to vary if it is upcast. You can see examples of hiding a method in 9, hiding a field in 7, and hiding a property in 8.