추상 클래스

추상 클래스란?

추상 클래스 정의하기

using System;

abstract class Animal {
    public abstract void Speak(); // Abstract method
    public void Sleep() { // Non-abstract method
        Console.WriteLine("The animal is sleeping.");
    }
}

추상 클래스 구현하기

using System;

abstract class Animal {
    public abstract void Speak(); // Abstract method
    public void Sleep() {
        Console.WriteLine("The animal is sleeping.");
    }
}

class Dog : Animal {
    public override void Speak() {
        Console.WriteLine("The dog barks.");
    }
}

class Program {
    static void Main() {
        Dog myDog = new Dog();
        myDog.Speak(); // Outputs: The dog barks.
        myDog.Sleep(); // Outputs: The animal is sleeping.
    }
}

추상 클래스와 인터페이스 비교

추상 클래스를 사용하는 경우

연습 과제

using System;

abstract class Shape {
    public abstract double CalculateArea();
}

class Rectangle : Shape {
    public double Width { get; set; }
    public double Height { get; set; }

    public override double CalculateArea() {
        return Width * Height;
    }
}

class Circle : Shape {
    public double Radius { get; set; }

    public override double CalculateArea() {
        return Math.PI * Radius * Radius;
    }
}

class Program {
    static void Main() {
        Shape rectangle = new Rectangle { Width = 5, Height = 4 };
        Shape circle = new Circle { Radius = 3 };

        Console.WriteLine("Rectangle Area: " + rectangle.CalculateArea());
        Console.WriteLine("Circle Area: " + circle.CalculateArea());
    }
}

추상 클래스 모범 사례

잘하셨습니다!