Java设计模式之享元模式(Flyweight Pattern)详解

public interface Piece {
    void put(int x, int y);
}
public class BlackPiece implements Piece {
    @Override
    public void put(int x, int y) {
        System.out.println("在坐标 (" + x + ", " + y + ") 放置了一个黑棋子");
    }
}
public class WhitePiece implements Piece {
    @Override
    public void put(int x, int y) {
        System.out.println("在坐标 (" + x + ", " + y + ") 放置了一个白棋子");
    }
}

import java.util.HashMap;
import java.util.Map;
public class PieceFactory {
    private final Map<String, Piece> map = new HashMap<>();
    public Piece getPiece(String color) {
        Piece piece = map.get(color);
        if (piece == null) {
            switch (color) {
                case "black":
                    piece = new BlackPiece();
                    break;
                case "white":
                    piece = new WhitePiece();
                    break;
                default:
                    throw new IllegalArgumentException("Unsupported color: " + color);
            }
            map.put(color, piece);
        }
        return piece;
    }
}

public class Client {
    public static void main(String[] args) {
        PieceFactory factory = new PieceFactory();
        Piece black1 = factory.getPiece("black");
        black1.put(1, 1);
        Piece black2 = factory.getPiece("black");
        black2.put(2, 2);
        Piece white1 = factory.getPiece("white");
        white1.put(3, 3);
        Piece white2 = factory.getPiece("white");
        white2.put(4, 4);
    }
}