Java设计模式之享元模式详解

// 享元工厂
public class FlyweightFactory {
    private Map<String, Flyweight> flyweights = new HashMap<>();
    public Flyweight getFlyweight(String key) {
        if (!flyweights.containsKey(key)) {
            flyweights.put(key, new ConcreteFlyweight());
        }
        return flyweights.get(key);
    }
}
// 享元接口
public interface Flyweight {
    void operation();
}
// 具体享元类
public class ConcreteFlyweight implements Flyweight {
    @Override
    public void operation() {
        System.out.println("ConcreteFlyweight is performing operation.");
    }
}

// 文字编辑器例子
FlyweightFactory factory = new FlyweightFactory();
Flyweight letterA = factory.getFlyweight("A");
Flyweight letterB = factory.getFlyweight("B");
letterA.operation(); // 共享对象A的操作
letterB.operation(); // 共享对象B的操作