飞行重量级设计模式适用于减少实例化成本吗？

飞行重量级设计模式（Flyweight Design Pattern）适用于减少实例化成本。该设计模式的主要目标是通过共享对象来减少内存和性能开销。

下面是一个包含代码示例的解决方法：

首先，我们创建一个享元接口（Flyweight）来定义共享对象的方法：

public interface Flyweight {
    void operation();
}

然后，我们创建具体的享元类（ConcreteFlyweight）来实现共享对象：

public class ConcreteFlyweight implements Flyweight {
    private String intrinsicState;

    public ConcreteFlyweight(String intrinsicState) {
        this.intrinsicState = intrinsicState;
    }

    public void operation() {
        System.out.println("ConcreteFlyweight: " + intrinsicState);
    }
}

接下来，我们创建一个享元工厂（FlyweightFactory）来管理和创建共享对象：

import java.util.HashMap;
import java.util.Map;

public class FlyweightFactory {
    private Map<String, Flyweight> flyweights = new HashMap<>();

    public Flyweight getFlyweight(String key) {
        if (flyweights.containsKey(key)) {
            return flyweights.get(key);
        } else {
            Flyweight flyweight = new ConcreteFlyweight(key);
            flyweights.put(key, flyweight);
            return flyweight;
        }
    }
}

最后，我们可以使用享元工厂来获取共享对象并调用其方法：

public class Main {
    public static void main(String[] args) {
        FlyweightFactory factory = new FlyweightFactory();

        Flyweight flyweight1 = factory.getFlyweight("A");
        flyweight1.operation(); // 输出：ConcreteFlyweight: A

        Flyweight flyweight2 = factory.getFlyweight("B");
        flyweight2.operation(); // 输出：ConcreteFlyweight: B

        Flyweight flyweight3 = factory.getFlyweight("A");
        flyweight3.operation(); // 输出：ConcreteFlyweight: A
    }
}

在上述示例中，我们通过享元工厂获取共享对象。当请求相同的享元对象时，享元工厂会返回已经创建的对象，从而避免了重复创建对象的成本。通过共享对象，我们可以减少实例化成本并提高性能。