抽象类（abstract），虚方法（virtual），接口（interface）对比分析（四）

用abstract，virtual ，interface三种方法做同一个例子

virtual:

using System;
using System.Collections.Generic;
using System.Text;

namespace Test
...{
    class Employee
    ...{
        protected string _name;
        public Employee() ...{ }
        public Employee(string name)
        ...{
            _name = name;
        }
        public virtual void StartWork()
        ...{
            Console.WriteLine(_name+"Start Work");
        }
    }
    class Manager:Employee
    ...{
        public Manager(string name):base(name)...{}
        public override void StartWork()
        ...{
            base.StartWork();
            Console.WriteLine("Orders to staff");
        }
    }
    class Secretary:Employee
    ...{
        public Secretary(string name):base(name)...{}
            public override void  StartWork()
            ...{
                base.StartWork();
                 Console.WriteLine("Assist the Manager");
            }
    }
    class Seller:Employee
    ...{
        public Seller(string name):base(name)...{}
            public override void  StartWork()
            ...{
                base.StartWork();
                 Console.WriteLine("Product sales");
            }
    }
    class Accountant : Employee
    ...{
        public Accountant(string name) : base(name) ...{ }
        public override void  StartWork()
            ...{
                base.StartWork();
                  Console.WriteLine("Manage finance of company");
            }
    }
    class PolymorphismTest
    ...{
        static void Main()
        ...{
            Employee[] emp=new Employee[5];
            emp[0] = new Manager("Manager");
            emp[1] = new Secretary("Secretary");
            emp[2] = new Seller("Seller1");
            emp[3] = new Seller("Sell2");
            emp[4] = new Accountant("Accountant");
            Console.WriteLine("8 o'colck, Start Work");
            foreach (Employee e in emp)
            ...{
                e.StartWork();
            }
        }
    }

}

 

abstract:

using System;
using System.Collections.Generic;
using System.Text;

namespace AbstractPolymorphismTest
...{
    abstract class Employee
    ...{
        protected string _name;
        protected Employee() ...{ }
        protected Employee(string name)
        ...{
            _name = name;
        }
        public abstract void StartWork();
        
    }
    class Manager : Employee
    ...{
        public Manager(string name) : base(name) ...{ }
        public override void StartWork()
        ...{
            
            Console.WriteLine(_name+"Orders to staff");
        }
    }
    class Secretary : Employee
    ...{
        public Secretary(string name) : base(name) ...{ }
        public override void StartWork()
        ...{
            
            Console.WriteLine(_name+"Assist the Manager");
        }
    }
    class Seller : Employee
    ...{
        public Seller(string name) : base(name) ...{ }
        public override void StartWork()
        ...{
            
            Console.WriteLine(_name+"Product sales");
        }
    }
    class Accountant : Employee
    ...{
        public Accountant(string name) : base(name) ...{ }
        public override void StartWork()
        ...{
            
            Console.WriteLine(_name+"Manage finance of company");
        }
    }
    class AbstractPolymorphismTest
    ...{
        static void Main()
        ...{
            Employee[] emp = new Employee[5];
            emp[0] = new Manager("Manager");
            emp[1] = new Secretary("Secretary");
            emp[2] = new Seller("Seller1");
            emp[3] = new Seller("Sell2");
            emp[4] = new Accountant("Accountant");
            Console.WriteLine("8 o'colck, Start Work");
            foreach (Employee e in emp)
            ...{
                e.StartWork();
            }
        }
    }

}

 

interface:

using System;
using System.Collections.Generic;
using System.Text;

namespace InterfacePolymorphismTest
...{
    interface IEmployee
    ...{
        void StartWork();
    }
    class Manager : IEmployee
    ...{
        private string _name;
        public Manager(string name)
        ...{
            _name = name;
        }
        public void StartWork()
        ...{

            Console.WriteLine(_name + "Orders to staff");
        }
    }
    class Secretary : IEmployee
    ...{
        private string _name;
        public Secretary(string name)
        ...{
            _name = name;
        }
        public void StartWork()
        ...{

            Console.WriteLine(_name + "Assist the Manager");
        }
    }
    class Seller : IEmployee
    ...{
        private string _name;
        public Seller(string name)
        ...{
            _name = name;
        }
        public void StartWork()
        ...{

            Console.WriteLine(_name + "Product sales");
        }
    }
    class Accountant : IEmployee
    ...{
        private string _name;
        public Accountant(string name)
        ...{
            _name = name;
        }
        public void StartWork()
        ...{

            Console.WriteLine(_name + "Manage finance of company");
        }
    }
    class InterfacePolymorphismTest
    ...{
        static void Main()
        ...{
            IEmployee[] emp = new IEmployee[5];
            emp[0] = new Manager("Manager");
            emp[1] = new Secretary("Secretary");
            emp[2] = new Seller("Seller1");
            emp[3] = new Seller("Sell2");
            emp[4] = new Accountant("Accountant");
            Console.WriteLine("8 o'colck, Start Work");
            foreach (IEmployee e in emp)
            ...{
                e.StartWork();
            }
        }
    }

}