12. Enjoy meta mode (Flyweight pattern)

usingSystem;usingSystem.Collections;namespaceconsoleapplication5{classProgram {/// <summary>        ///in the software development process, if we need to reuse an object,///If we repeatedly use new to create this object, then we need to apply memory space multiple times in memory,///This can occur in more and more memory usage, and the problem is very serious, but the meta-mode can solve this problem,///Here's a look at how the enjoy meta-mode solves this problem. /// </summary>        /// <param name= "args" ></param>        Static voidMain (string[] args) {Charactorfactory Factory=Newcharactorfactory (); //charactor "A"Charactora CA = (Charactora) factory. Getcharactor ("A"); Ca. Setpointsize ( A); Ca.            Display (); //charactor "B"Charactorb cb = (Charactorb) factory. Getcharactor ("B"); Cb. Setpointsize (Ten); Cb.            Display (); //charactor "C"Charactorc cc = (CHARACTORC) factory. Getcharactor ("C"); Cc. Setpointsize ( -); Cc.        Display (); }    }    //Character factory (responsible for creating and managing the enjoy meta object)     Public classCharactorfactory {// Fields        PrivateHashtable charactors =NewHashtable (); //Constructor         Publiccharactorfactory () {charactors. ADD ("A",NewCharactora ()); Charactors. ADD ("B",NewCharactorb ()); Charactors. ADD ("C",NewCharactorc ()); }        //Method         PublicCharactor Getcharactor (stringkey) {charactor charactor= Charactors[key] ascharactor; if(Charactor = =NULL)            {                Switch(key) { Case "A": Charactor =NewCharactora (); Break;  Case "B": Charactor =NewCharactorb (); Break;  Case "C": Charactor =NewCharactorc (); Break; //} charactors.            ADD (key, charactor); }            returncharactor; }    }    /// <summary>    ///A special class of characters that provides a method for a specific class of enjoyment/// </summary>     Public Abstract classCharactor {// Fields        protected Char_symbol; protected int_width; protected int_height; protected int_ascent; protected int_descent; protected int_pointsize; //Method         Public Abstract voidSetpointsize (intsize);  Public Abstract voidDisplay (); }    /// <summary>    ///character a/// </summary>     Public classCharactora:charactor {//Constructor         PublicCharactora () { This. _symbol ='A';  This. _height = -;  This. _width = -;  This. _ascent = -;  This. _descent =0;  This. _pointsize = A; }        //Method         Public Override voidSetpointsize (intsize) {             This. _pointsize =size; }         Public Override voidDisplay () {Console.WriteLine ( This. _symbol +"pointsize:"+ This. _pointsize); }    }    /// <summary>    ///Character B/// </summary>     Public classCharactorb:charactor {//Constructor         PublicCharactorb () { This. _symbol ='B';  This. _height = -;  This. _width = $;  This. _ascent = the;  This. _descent =0;  This. _pointsize =Ten; }        //Method         Public Override voidSetpointsize (intsize) {             This. _pointsize =size; }         Public Override voidDisplay () {Console.WriteLine ( This. _symbol +"pointsize:"+ This. _pointsize); }    }    /// <summary>    ///character C/// </summary>     Public classCharactorc:charactor {//Constructor         PublicCharactorc () { This. _symbol ='C';  This. _height = -;  This. _width = the;  This. _ascent = About;  This. _descent =0;  This. _pointsize = -; }        //Method         Public Override voidSetpointsize (intsize) {             This. _pointsize =size; }         Public Override voidDisplay () {Console.WriteLine ( This. _symbol +"pointsize:"+ This. _pointsize); }    }}

12. Enjoy meta mode (Flyweight pattern)