13. 享元模式

[实验任务一]：围棋

设计一个围棋软件，在系统中只存在一个白棋对象和一个黑棋对象，但是它们可以在棋盘的不同位置显示多次。

类图

代码

java代码

package test13;

public class BlackChess implements Chess{

    private String color = "黑色";

    @Override
    public String getColor() {
        return color;
    }

    @Override
    public void location(Location location) {

    }
}

package test13;

public interface Chess {

    public String getColor();
    public void location(Location location);

}

package test13;

import java.util.ArrayList;

public class ChessFactory {

    private ArrayList chess = new ArrayList();
    //单例模式
    private static ChessFactory chessFactory = null;

    private ChessFactory(){

    }

    //简单工厂模式
    public Chess productChess(String type) throws Exception {
        if(type.equalsIgnoreCase("hz")){
            System.out.println("棋子工厂生产黑子");
            BlackChess hz = new BlackChess();
            chess.add(hz);
            return hz;
        }else if(type.equalsIgnoreCase("bz")){
            System.out.println("棋子工厂生产白子");
            WhiteChess bz = new WhiteChess();
            return bz;
        }else {
            throw new Exception("对不起，没有该颜色的棋子");
        }
    }

    //单例模式
    public static ChessFactory getInstance(){
        if(chessFactory==null){
            chessFactory = new ChessFactory();

        }else {
            System.out.println("重复生成工厂");
        }
        return chessFactory;
    }

    public int getChessNum(){
        return chess.size();
    }

    public ArrayList getChess() {
        return chess;
    }

    public void setChess(ArrayList chess) {
        this.chess = chess;
    }
}

package test13;

public class Client {

    public static void main(String[] args) throws Exception {
        Chess c1,c2,c3,c4;
        ChessFactory cf;
        cf = ChessFactory.getInstance();

        c1 = cf.productChess("hz");
        c1.location(new Location("1,1"));

        c2 = cf.productChess("bz");
        c2.location(new Location("2,1"));

        c3 = cf.productChess("hz");
        c3.location(new Location("3,1"));

        c4 = cf.productChess("bz");
        c4.location(new Location("4,1"));
    }
}

package test13;

public class Location {

    private String location;

    public Location(String location){
        this.location = location;
        System.out.println("棋子位置为"+location);
    }

    public void setLocation(String location) {
        this.location = location;
    }

    public String getLocation() {
        return location;
    }
}

package test13;

public class WhiteChess implements Chess {

    private String color = "白色";

    @Override
    public String getColor() {
        return color;
    }

    @Override
    public void location(Location location) {

    }
}

c++代码

#include <iostream>
#include <string>
#include <list>
using namespace std;

class Location{
private:
    string location;
public:
    Location(string location){
        this->location = location;
        cout<<"棋子位置为"+location;
    }
};

class Chess{
public:
    virtual void location(Location location){}
};

class BlackChess: public Chess{
public:
    void location(){}
};

class WhiteChess: public Chess{
public:
    void location(){}
};

class ChessFactory{
private:
    list<Chess> chess;
    ChessFactory(){};

public:
    Chess productChess(string type){
        if(type==("hz")){
            cout<<("棋子工厂生产黑子");
            BlackChess hz;
            chess.push_back(hz);
            return hz;
        }else if(type==("bz")){
            cout<<("棋子工厂生产白子");
            WhiteChess bz;
            chess.push_back(bz);
            return bz;
        }else {
            cout<<("对不起，没有该颜色的棋子");
        }
    }
    static ChessFactory getInstance(){
        ChessFactory cf;
        return cf;
    }
};

int main(){
    Chess c1,c2,c3,c4;
    ChessFactory cf = ChessFactory::getInstance();

    c1 = cf.productChess("hz");
    c1.location(Location("1,1"));

    c2 = cf.productChess("bz");
    c2.location(Location("2,1"));

    c3 = cf.productChess("hz");
    c3.location(Location("3,1"));

    c4 = cf.productChess("bz");
    c4.location(Location("4,1"));
}