LintCode 496: Toy Factory (工厂模式）

最新推荐文章于 2020-08-05 11:03:12 发布

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本文介绍了一个简单的玩具工厂设计模式实现，该模式可以根据不同的输入类型创建相应的玩具实例（如Dog或Cat），并演示了如何让这些玩具实例执行特定行为。

Toy Factory
中文English
Factory is a design pattern in common usage. Please implement a ToyFactory which can generate proper toy based on the given type.

Example
Example 1：

Input：
ToyFactory tf = ToyFactory();
Toy toy = tf.getToy(‘Dog’);
toy.talk();
Output:
Wow
Example 2:

Input:
ToyFactory tf = ToyFactory();
toy = tf.getToy(‘Cat’);
toy.talk();
Output：
Meow

代码如下：

/**
 * Your object will be instantiated and called as such:
 * ToyFactory* tf = new ToyFactory();
 * Toy* toy = tf->getToy(type);
 * toy->talk();
 */
class Toy {
public:
    virtual void talk() const=0;
};

class Dog: public Toy {
public:
    void talk() const {
        cout<<"Wow"<<endl;
    }
};

class Cat: public Toy {
public:
    void talk() const {
        cout<<"Meow"<<endl;
    }
};

class ToyFactory {
public:
    /**
     * @param type a string
     * @return Get object of the type
     */
    Toy* getToy(string& type) {
        if (type == "Cat") {
            return new Cat();
        } else if (type == "Dog") {
            return new Dog();
        } else {
            return NULL;
        }
    }
};