添加Lesson18

2025-09-14 15:08:38 +08:00
parent d6767da6da
commit c16355e935
5 changed files with 222 additions and 0 deletions
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+using System.Drawing;
+
+namespace Lesson18_多态_抽象类和抽象方法练习
+{
+    abstract class Animal
+    {
+        public abstract void Shout();
+    }
+    class Human : Animal
+    {
+        public override void Shout()
+        {
+            Console.WriteLine("人叫");
+        }
+    }
+    class Dog : Animal
+    {
+        public override void Shout()
+        {
+            Console.WriteLine("狗叫");
+        }
+    }
+    class Cat : Animal
+    {
+        public override void Shout()
+        {
+            Console.WriteLine("猫叫");
+        }
+    }
+    abstract class Graph
+    {
+        public abstract void Perimeter();
+        public abstract void Area();
+    }
+    class RectAngle : Graph
+    {
+        private int x, y;
+        public RectAngle(int x,int y)
+        {
+            this.x = x;
+            this.y = y;
+        }
+        public override void Area()
+        {
+            Console.WriteLine("面积为:"+x*y);
+        }
+
+        public override void Perimeter()
+        {
+            Console.WriteLine("周长为"+(x+y)*2);
+        }
+    }
+    class Square : Graph
+    {
+        private int x;
+        public Square(int x)
+        {
+            this.x = x;
+        }
+        public override void Area()
+        {
+            Console.WriteLine("面积为:" + x * x);
+        }
+
+        public override void Perimeter()
+        {
+            Console.WriteLine("周长为" + x * 4);
+        }
+    }
+    class Round : Graph
+    {
+        private double PI = 3.1415926;
+        int r;
+        public Round(int r)
+        {
+            this.r = r;
+        }
+        public override void Perimeter()
+        {
+            double perimeter = 2 * PI * r;
+            Console.WriteLine("圆的周长{0}", perimeter);
+        }
+        public override void Area()
+        {
+            double areas = PI * r * r;
+            Console.WriteLine("圆的面积{0}", areas);
+        }
+    }
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Animal human = new Human();
+            human.Shout();
+            Animal dog = new Dog();
+            dog.Shout();
+            Animal cat = new Cat();
+            cat.Shout();
+
+            Graph rectangle = new RectAngle(2, 3);
+            rectangle.Perimeter();
+            rectangle.Area();
+            Graph square = new Square(2);
+            square.Perimeter();
+            square.Area();
+            Graph round = new Round(3);
+            round.Perimeter();
+            round.Area();
+        }
+    }
+}