【设计模式】之 Strategy 策略模式

 

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

namespace DesignFactory.Strategy
{
    /// <summary>
    /// 策略模式
    /// </summary>
    class StrategyPattern
    {
    }

    abstract class SortStrategy
    {
        abstract public void Sort(ArrayList list);
    }

    class QuickSort : SortStrategy
    {
        public override void Sort(ArrayList list)
        {
            list.Sort();
            Console.WriteLine("QuickSorted list");
        }
    }


    class ShellSort : SortStrategy
    {
        public override void Sort(ArrayList list)
        {
            //list.ShellSort();
            Console.WriteLine("ShellSorted list");
        }
    }

    class MergeSort : SortStrategy
    {

        public override void Sort(ArrayList list)
        {
            //list.MergeSort();
            Console.WriteLine("MergeSorted list");
        }
    }


    class SortedList
    {
        private ArrayList list = new ArrayList();
        private SortStrategy sortstrategy;

        public void SetSortStrategy(SortStrategy sortstrategy)
        {
            this.sortstrategy = sortstrategy;
        }

        public void Sort()
        {
            sortstrategy.Sort(list);
        }

        public void Add(string name)
        {
            list.Add(name);
        }

        public void Display()
        {
            foreach (string name in list)
            {
                Console.WriteLine(Environment.NewLine + name);
            }
        }
    }

    public class StrategyApp
    {
        public static void Main(string[] args)
        {
            SortedList studentRecords = new SortedList();
            studentRecords.Add("Samual");
            studentRecords.Add("Jimmy");
            studentRecords.Add("Sandra");
            studentRecords.Add("Anna");
            studentRecords.Add("Vivek");

            studentRecords.SetSortStrategy(new QuickSort());
            studentRecords.Sort();
            studentRecords.Display();

        }
    }


}