结构型模式：Flyweight（享元）_flyweightclass-优快云博客

本文介绍了一个使用Java实现的咖啡订单系统，该系统运用享元模式来高效管理咖啡口味对象。通过享元工厂创建并复用咖啡口味实例，减少内存消耗。文章展示了如何为不同餐桌提供特定口味的咖啡服务。

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import java.util.HashMap;
import java.util.Map;
 
// Flyweight object interface
interface CoffeeOrder {
    public void serveCoffee(CoffeeOrderContext context);
}
 
// ConcreteFlyweight object that creates ConcreteFlyweight 
class CoffeeFlavor implements CoffeeOrder {
    private final String flavor;
 
    public CoffeeFlavor(String newFlavor) {
        this.flavor = newFlavor;
    }
 
    public String getFlavor() {
        return this.flavor;
    }
 
    public void serveCoffee(CoffeeOrderContext context) {
        System.out.println("Serving Coffee flavor " + flavor + " to table number " + context.getTable());
    }
}
 
class CoffeeOrderContext {
   private final int tableNumber;
 
   public CoffeeOrderContext(int tableNumber) {
       this.tableNumber = tableNumber;
   }
 
   public int getTable() {
       return this.tableNumber;
   }
}
 
//FlyweightFactory object
class CoffeeFlavorFactory {
    private Map<String, CoffeeFlavor> flavors = new HashMap<String, CoffeeFlavor>();
 
    public CoffeeFlavor getCoffeeFlavor(String flavorName) {
        CoffeeFlavor flavor = flavors.get(flavorName);
        if (flavor == null) {
            flavor = new CoffeeFlavor(flavorName);
            flavors.put(flavorName, flavor);
        }
        return flavor;
    }
 
    public int getTotalCoffeeFlavorsMade() {
        return flavors.size();
    }
}
 
class TestFlyweight {
   /** The flavors ordered. */
   private static CoffeeFlavor[] flavors = new CoffeeFlavor[100];
   /** The tables for the orders. */
   private static CoffeeOrderContext[] tables = new CoffeeOrderContext[100];
   private static int ordersMade = 0;
   private static CoffeeFlavorFactory flavorFactory;
 
   public static void takeOrders(String flavorIn, int table) {
       flavors[ordersMade] = flavorFactory.getCoffeeFlavor(flavorIn);
       tables[ordersMade++] = new CoffeeOrderContext(table);
   }
 
   public static void main(String[] args) {
       flavorFactory = new CoffeeFlavorFactory();
 
       takeOrders("Cappuccino", 2);
       takeOrders("Cappuccino", 2);
       takeOrders("Frappe", 1);
       takeOrders("Frappe", 1);
       takeOrders("Xpresso", 1);
       takeOrders("Frappe", 897);
       takeOrders("Cappuccino", 97);
       takeOrders("Cappuccino", 97);
       takeOrders("Frappe", 3);
       takeOrders("Xpresso", 3);
       takeOrders("Cappuccino", 3);
       takeOrders("Xpresso", 96);
       takeOrders("Frappe", 552);
       takeOrders("Cappuccino", 121);
       takeOrders("Xpresso", 121);
 
       for (int i = 0; i < ordersMade; ++i) {
           flavors[i].serveCoffee(tables[i]);
       }
       System.out.println(" ");
       System.out.println("total CoffeeFlavor objects made: " +  flavorFactory.getTotalCoffeeFlavorsMade());
   }
}