Toy Factory

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

Example

ToyFactory tf = ToyFactory();
Toy toy = tf.getToy('Dog');
toy.talk(); 
>> Wow

toy = tf.getToy('Cat');
toy.talk();
>> Meow

加了一个Enum来表示不用的ToyType; 可以不加直接上String

/**
 * Your object will be instantiated and called as such:
 * ToyFactory tf = new ToyFactory();
 * Toy toy = tf.getToy(type);
 * toy.talk();
 */
interface Toy {
    void talk();
}


class Dog implements Toy {
    // Write your code here
    @Override
    public void talk(){
        System.out.println("Wow");
    }
}

class Cat implements Toy {
    // Write your code here
    @Override
    public void talk(){
        System.out.println("Meow");
    }
}

public class ToyFactory {
    /**
     * @param type a string
     * @return Get object of the type
     */
    public Toy getToy(String type) {
        // Write your code here
        ToyType t = ToyType.fromString(type);
        switch (t){
            case DOG: return new Dog();
            case CAT: return new Cat();
            default: return null;
        }
    }
    
    public enum ToyType {

        DOG("Dog"), CAT("Cat"), UNKNOWN("UNKNOWN");
    
        private String name;
    
        private ToyType(String name) {
            this.name = name;
        }
    
        public static ToyType fromString(String name) {
            for (ToyType toyType : ToyType.values()) {
                if (toyType.getName().equals(name)) {
                    return toyType;
                }
            }
            return UNKNOWN;
        }
        
        private String getName(){
            return name;
        }
    }
}