C#课堂案例(多态)
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在编程语言的世界里,C# 是一种面向对象的语言,它具有丰富的特性和强大的功能。本堂课我们将聚焦于“多态”这一核心概念,多态是面向对象编程的三大特性(封装、继承、多态)之一,对于理解和编写高效、灵活的代码至关重要。 标题中的“C#课堂案例(多态)”暗示了我们将通过具体的实例来探讨C#中的多态性。多态性允许我们设计出更为通用的代码,使得不同类型的对象能够共享相同的接口或方法,从而实现代码的复用和扩展。 描述中提到的是“课堂素材”,这意味着我们将深入学习并实践多态的实现。在C#中,多态主要体现在两个方面:方法的重载(Overloading)和方法的重写(Overriding)。下面我们将详细介绍这两个概念。 1. 方法的重载:在同一作用域内,可以定义多个同名但参数列表不同的方法,这就是方法的重载。例如,我们可以创建一个计算面积的方法,分别接受长方形、圆形和三角形的参数,虽然都是计算面积,但实现方式各异。 ```csharp public class Shape { public virtual double GetArea() => 0; } public class Rectangle : Shape { private double width, height; public Rectangle(double w, double h) { width = w; height = h; } public override double GetArea() => width * height; } public class Circle : Shape { private double radius; public Circle(double r) { radius = r; } public override double GetArea() => Math.PI * radius * radius; } ``` 2. 方法的重写:当子类继承父类时,如果子类想要改变父类中虚方法的实现,可以使用`override`关键字重写该方法。这在多态中扮演着关键角色,使得子类对象可以调用自己的版本,而不是父类的版本。 例如,上面的`Shape`类中的`GetArea`方法是虚方法,子类可以重写它以提供特定形状的面积计算。当我们有一个`Shape`类型的引用指向`Rectangle`或`Circle`的对象时,调用`GetArea`将根据实际的对象类型执行相应的计算。 ```csharp Shape shape1 = new Rectangle(5, 4); Shape shape2 = new Circle(3); Console.WriteLine(shape1.GetArea()); // 输出矩形的面积 Console.WriteLine(shape2.GetArea()); // 输出圆的面积 ``` 此外,C#的`interface`也是实现多态的一种方式。接口定义了一组方法签名,实现了接口的类必须提供这些方法的实现。这种方式强制了多态性,确保任何实现了该接口的类都具有相同的行为。 ```csharp public interface IRunnable { void Run(); } public class Car : IRunnable { public void Run() => Console.WriteLine("Car is running."); } public class Person : IRunnable { public void Run() => Console.WriteLine("Person is running."); } IRunnable runner1 = new Car(); IRunnable runner2 = new Person(); runner1.Run(); // 输出 "Car is running." runner2.Run(); // 输出 "Person is running." ``` C#中的多态让我们能够编写更加抽象、灵活的代码,增强了代码的可读性和可维护性。通过方法的重载和重写,以及接口的使用,我们可以在不牺牲类型安全性的前提下实现更广泛的代码复用。理解并熟练运用多态,是每个C#开发者进阶的必经之路。
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