设计模式-享元模式

import java.nio.channels.Pipe;

public class 享元模式 {
    public static void main(String[] args)
    {
        pieceFactory factory=new pieceFactory();
        Piece whitePiece=factory.getPiece(0);
        Piece whitePiece1=factory.getPiece(1);
        Piece whitePiece2=factory.getPiece(0);
        System.out.println(whitePiece);
        System.out.println(whitePiece);
        System.out.println(whitePiece);//位于同一位置

        whitePiece.draw(25,30);

    }
}

class pieceFactory{
    private Piece[] pieces={new whitePiece(),new blackPiece()};

    public Piece getPiece(int key)
    {
        if(key==0)
            return pieces[0];
        else
            return pieces[1];
    }
}
abstract class Piece{
    protected String color;
    public abstract void draw(int x,int y);
}
class whitePiece extends Piece{
    public whitePiece()
    {
        this.color="white";
    }
    @Override
    public void draw(int x,int y)
    {
        System.out.println("draw a color:  "+color+"piece x:  "+x+"piece y:  "+y);
    }
}
class blackPiece extends Piece{
    public blackPiece()
    {
        this.color="black";
    }
    @Override
    public void draw(int x,int y)
    {
        System.out.println("draw a color:  "+color+"piece x:  "+x+"piece y:  "+y);
    }
}

运行结果