C# 오버라이드, 오버로드 (13일차)

오버라이드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_001
{
    class Mammal
    {
        public virtual void Move()
        {
            Console.WriteLine("이동한다");
        }
    }
    class Lion : Mammal
    {
        public override void Move() //override 자리에 아무것도 안적으면 new로 번역한다.
        {
            Console.WriteLine("네발로 걷는다");
        }
    }
    class Whale : Mammal
    {
        public override void Move()
        {
            Console.WriteLine("수영한다");
        }
    }
    class Human : Mammal
    {
        public override void Move()
        {
            Console.WriteLine("두발로 걷는다.");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Mammal aMammal = new Mammal();
            aMammal.Move();

            aMammal = new Lion();
            aMammal.Move();

            aMammal = new Whale();
            aMammal.Move();

            aMammal = new Human();
            aMammal.Move();



        }
    }
}

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_001
{
    class Mammal
    {
        public virtual void Move()
        {
            Console.WriteLine("이동한다");
        }
    }
    class Lion : Mammal
    {
        public override void Move() //override 자리에 아무것도 안적으면 new로 번역한다.
        {
            Console.WriteLine("네발로 걷는다");
        }
    }
    class Whale : Mammal
    {
        public override void Move()
        {
            Console.WriteLine("수영한다");
        }
    }
    class Human : Mammal
    {
        public override void Move()
        {
            Console.WriteLine("두발로 걷는다.");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            //배열 객체
            Mammal[] aMammal = new Mammal[4] { new Mammal(), new Lion(), new Whale(), new Human()};
            aMammal[0] = new Mammal();
            aMammal[1] = new Lion();
            aMammal[2] = new Whale();
            aMammal[3] = new Human(); //두가지 방법 가능
            
            aMammal[0].Move();
            aMammal[1].Move();
            aMammal[2].Move();
            aMammal[3].Move();

            foreach(Mammal Temp in aMammal)
            {
                Temp.Move();
            }

            for (int a= 0; a < aMammal.Length;a++)
            {
                aMammal[a].Move();
            }                   //두가지 방법 가능


        }
    }
}

ToString 오버라이드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_003
{
    public class Point
    {
        int x, y;
        public Point(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
        public override string ToString()
        {
            return "x : " + x + " y : " + y;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Point pt = new Point(2, 10);
            Console.WriteLine(pt.ToString());

        }
    }
}

오버라이드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_004
{
    class Book
    {
        decimal isbn13;
        string title;
        string contents;
        public Book(decimal isbn13, string title, string contents)
        {
            this.isbn13 = isbn13;
            this.title = title;
            this.contents = contents;
        }
        public override bool Equals(object obj) //최상위 클래스의 매개변수
        {
            if(obj==null) //인자로 받은 객체가 null인지 판단
            {
                return false;
            }
            Book book = obj as Book; //매개변수가 Book클래스라면 매개변수가
                                     //book에 obj가 가리키고 있는 값을 넘겨 줌
            if(book==null) //Book클래스 인지 아닌지 판단.
            {
                return false;
            }

            return this.isbn13 == book.isbn13; //각 객체 안의 isbn 비교 후 bool이므로 true false 반환
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Book book1 = new Book(9788998139018, "리버스 엔지니어링 바이블:", ". . . . .");
            Book book2 = new Book(9788998139018, "리버스 엔지니어링 바이블:", ". . . . .");
            Book book3 = new Book(9788992939409, "파이썬 3.6프로그래밍", ". . . . .");

            Console.WriteLine(book1.Equals(book2));//book1과 book2 비교
            Console.WriteLine(book2.Equals(book3));//book2와 book3 비교
            //isbn 값이 같으면 true 틀리면 false 반환
        }
    }
}

 

메서드 오버로드

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_005
{
    class Mathmatics
    {
        public int Abs(int value)
        {
            return(value >= 0) ? value : -value;
        }
        public double Abs(double value)
        {
            return (value >= 0) ? value : -value;
        }
        public decimal Abs(decimal value)
        {
            return (value >= 0) ? value : -value;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Mathmatics math = new Mathmatics();
            Console.WriteLine(math.Abs(-5));
            Console.WriteLine(math.Abs(-10.052));
            Console.WriteLine(math.Abs(20.01m));
        }
    }
}

연산자 오버로드

using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_008
{
    class Market
    {
        public int iApple;
        public int iOrange;
        public override string ToString()
        {
            return "{iApple = " + iApple + ", iOrange = " + iOrange+"}";
        }
        public static Market operator + (Market obj1, Market obj2)
        {

            Market obj3 = new Market();
            
            obj3.iApple = obj1.iApple + obj2.iApple;
            obj3.iOrange = obj1.iOrange + obj2.iOrange;
            Console.WriteLine("+ 연산자 호출됨");
            Console.WriteLine("obj1= " + obj1);
            Console.WriteLine("obj2= " + obj2);
            obj2.ToString();
            return  obj3;
        }       

}
    class Program
    {
        static void Main(string[] args)
        {
            Market 가게1 = new Market();
            Market 가게2 = new Market();

            가게1.iApple = 10;
            가게1.iOrange = 10;

            가게2.iApple = 100;
            가게2.iOrange = 100;
            Market 가게3 = 가게1 + 가게2;
            Console.WriteLine("가게3의 iApple과 iOrange는 {0}개", 가게3);
            
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_009
{
    class Complex
    {
        int Real;
        int Image;
        public Complex()
        {
        }
        public Complex(int Real, int Image)
        {
            this.Real = Real;
            this.Image = Image;
        }

        public override string ToString()
        {
            //{ 3 + 4i }
            return "{ " + Real + ((Image > 0) ? " + " + Image : " - " + Image * -1) + "i }";
        }
        static public Complex operator + (Complex iNum1, Complex iNum2)
        {
            Complex iNum3 = new Complex();

            iNum3.Real = iNum1.Real + iNum2.Real;
            iNum3.Image = iNum1.Image + iNum2.Image;
            return iNum3;
        }
        static public Complex operator -(Complex iNum1, Complex iNum2)
        {
            Complex iNum3 = new Complex();

            iNum3.Real = iNum1.Real - iNum2.Real;
            iNum3.Image = iNum1.Image - iNum2.Image;
            return iNum3;
        }
        static public Complex operator *(Complex iNum1, Complex iNum2)
        {
            Complex iNum3 = new Complex();

            iNum3.Real = (iNum1.Real * iNum2.Real)-(iNum1.Image*iNum2.Image);
            iNum3.Image = (iNum1.Real * iNum2.Image) + (iNum1.Image * iNum2.Real);
            return iNum3;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Complex num1 = new Complex(3,4);
            Complex num2 = new Complex(5,6);

            Complex num3 = num1 + num2;
            Console.WriteLine(num3);
            Complex num4 = num1 - num2;
            Console.WriteLine(num4);
            Complex num5 = num1 * num2;
            Console.WriteLine(num5);


        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _20200603_009
{
    class Complex
    {
        int Real;
        int Image;
        public Complex()
        {
        }
        public Complex(int Real, int Image)
        {
            this.Real = Real;
            this.Image = Image;
        }

        public override string ToString()
        {
            //{ 3 + 4i }
            return "{ " + Real + ((Image > 0) ? " + " + Image : " - " + Image * -1) + "i }";
        }
        static public Complex operator + (Complex iNum1, Complex iNum2)
        {
            
            return new Complex(iNum1.Real + iNum2.Real, iNum1.Image + iNum2.Image); ;
        }
        static public Complex operator -(Complex iNum1, Complex iNum2)
        { 
            return new Complex(iNum1.Real - iNum2.Real, iNum1.Image - iNum2.Image);
        }
        static public Complex operator *(Complex iNum1, Complex iNum2)
        {
            return new Complex((iNum1.Real * iNum2.Real) - (iNum1.Image * iNum2.Image), (iNum1.Real * iNum2.Image) + (iNum1.Image * iNum2.Real));
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Complex num1 = new Complex(3,4);
            Complex num2 = new Complex(5,6);

            Complex num3 = num1 + num2;
            Console.WriteLine(num3);
            Complex num4 = num1 - num2;
            Console.WriteLine(num4);
            Complex num5 = num1 * num2;
            Console.WriteLine(num5);


        }
    }
}